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Java课程课堂作业代码
日期:2022-05-11 11:00:12 作者:管理员 浏览量:3906

前言

本文章只是单纯记录课堂老师布置的课堂作业代码,题目都比较简单,所以没有写解题思路,相信大家都能理解,当然其中有的解法和代码不是最优的,当时只是为了完成题目,后来也懒得改了,如果有不恰当或者不正确的地方,欢迎指出


备注:有的忘记记录题目信息了,有的题目直接在作业系统里面提交了,请见谅,将就着看吧

1、

查看代码
package java_works;

import java.util.Scanner;

public class java_10001 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc=new Scanner(System.in);
		String b=sc.nextLine();
		int zm=0,kg=0,qt=0;
		for(int i=0;i<b.length();i++)
		{
			if(b.charAt(i)>=65&&b.charAt(i)<=90)
				zm++;
			else if(b.charAt(i)>=97&&b.charAt(i)<=122)
				zm++;
			else if(b.charAt(i)==32)
				kg++;
			else
				qt++;
		}
		System.out.println("字母:"+zm);
		System.out.println("空格:"+kg);
		System.out.println("其他:"+qt);
	}

}

2、

查看代码
package java_works;

import java.text.DecimalFormat;

import java.util.Scanner;

public class java_10002 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc=new Scanner(System.in);
		int k=sc.nextInt();
		double sum=0;
		for(double i=0;i<=k;i++)
		{
			sum=sum+((i+6)/(i+10));
		}
		System.out.print("sum:");
		System.out.printf("%.5f",sum);
	}

}

3、输入正整数N,输出[1, N]的之间的质数

查看代码
package java_works;

import java.util.Scanner;

public class java_10003 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc=new Scanner(System.in);
		int N=-1;
		N=sc.nextInt();
		for(int i=2;i<=N;i++)
		{
			int j;
			for(j=2;j<=Math.sqrt(i);j++)
			{
				if(i%j==0)break;
			}
			if(j>Math.sqrt(i))
				System.out.print(i+" ");
		}
	}

}

4、用户输入正整数K为3-6之间的数,然后输出k位数的水仙花数

查看代码
package java_works;

import java.util.Scanner;

public class java_10004 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		while(true) {
			Scanner sc=new Scanner(System.in);
			int K=-1;
			K=sc.nextInt();
			if(K == 0)
			{
				break;
			}
			int a[] = new int[K];
			int num = (int) Math.pow(10, K - 1) + 1;
			while (num <= Math.pow(10, K)) {
	            int sum = 0;
	            for (int j = 0; j < K; j++)
	                a[j] = (int) (num / Math.pow(10, j) % 10);
	            for (int j = 0; j < K; j++) 
	                sum = sum + (int) Math.pow(a[j],K); 
	            if (num == sum)
	                System.out.print(num + " ");
	            num++;
	        }
		}
		
	}

}

5、输入正整数K,用二维数组生成并存储K阶方阵,第一行为: 1, 2, 3, ..., K, 第二行为: K+1, K+2, ... ,K+K, ... 依次类推;然后输出方阵的转置。

查看代码
package java_works;

import java.util.Scanner;

public class java_10005 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int K = sc.nextInt();
		int a[][] = new int[K][K];
		int b[][] = new int[K][K];
		int z=1;
		for(int i=0;i<K;i++)
		{
			for(int j=0;j<K;j++)
			{
				a[i][j]=z;
				z++;
			}
		}
		for(int i=0;i<K;i++)
		{
			for(int j=0;j<K;j++)
			{
				b[j][i]=a[i][j];
			}
		}
		for(int i=0;i<K;i++)
		{
			for(int j=0;j<K;j++)
			{
				System.out.print(b[i][j]+" ");
			}
			System.out.println();
		}
	}
}

6、输入正整数N,然后输入N个浮点数,然后计算并输出它们平均值和方差。

查看代码
package java_works;

import java.util.Scanner;

public class java_10006 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int N = -1;
		N = sc.nextInt();
		double[] a = new double[N];
		for(int i=0;i<a.length;i++)
		{
			a[i]=sc.nextDouble();
		}
		Double sum=0.0;
		for(int i=0;i<a.length;i++)
		{
			sum=sum+a[i];                   //求和
		}
		double mean = 0.0,diff=0.0;
		mean = sum / N;
		double c=0.0;
		for(int i=0;i<a.length;i++)
		{
			c=c+Math.pow((a[i]-mean),2);
		}
		diff=c/N;
		System.out.printf("mean:"+"%.5f",mean);
		System.out.println();
		System.out.printf("diff:"+"%.5f",diff);
	}

}

7、输入正整数N,然后输入N个浮点数,然后计算并输出它们最小值和最大值。

查看代码
package java_works;

import java.util.Scanner;

public class java_10007 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int N = -1;
		N = sc.nextInt();
		Double[] a = new Double[N];
		for(int i=0;i<N;i++)
		{
			a[i]=sc.nextDouble();
		}
		double minv = a[0],maxv=a[0];
		for(int i=0;i<a.length;i++)
		{
			if(a[i]<minv)
				minv=a[i];
			if(a[i]>maxv)
				maxv=a[i];
		}
		System.out.printf("minv:"+"%.5f",minv);
		System.out.println();
		System.out.printf("maxv:"+"%.5f",maxv);
		
	}

}

8、输入正整数N,然后输入N个浮点数,再按从小到大排序并输出排序结果。

查看代码
package java_works;

import java.util.Scanner;

public class java_10008 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int N = -1;
		N = sc.nextInt();
		double[] a = new double[N];
		for(int i=0;i<a.length;i++)
		{
			a[i] = sc.nextDouble();
		}
		for(int i=0;i<a.length;i++)
			for(int j=0;j<a.length-1;j++)
			{
				double temp;
				if(a[j]>a[j+1])
				{
					temp=a[j+1];
					a[j+1]=a[j];
					a[j]=temp;
				}	
			}
		for(int i=0;i<a.length;i++)
		{
			System.out.printf("%.5f\n",a[i]);
		}
	}	
}

9、输入一行字符串,然后将每个单词的首字母变为大写

查看代码
package java_works;

import java.util.Scanner;

public class java_10009 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		String str ;
		str = sc.nextLine();
		daxie(str);
	}
	public static void daxie(String s){
		String a[] = s.split(" ");
		for(int i=0;i<a.length;i++)
		{
			String s1=a[i].substring(0,1).toUpperCase()+a[i].substring(1);
			System.out.print(s1+" ");
		}
	}
}

10、从键盘输入一行字符串,请在单词间做逆序调整。举例:“cat loves dog”逆序成“dog loves cat”。

查看代码
package java_works;

import java.util.Scanner;

public class Java_10010 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		String str;
		str = sc.nextLine();
		nixu(str);
	}
	public static void nixu(String s) {
		String[] a = s.split(" ");
		String temp = "";
		for (int i = 0; i < a.length/2; i++) {
			temp = a[i];
			a[i] = a[a.length-1-i];
			a[a.length-1-i] = temp;
		}
		for(int i=0;i<a.length;i++){
			System.out.print(a[i]+" ");
		}
		
	}

}

11、间隔符规范化。输入一行字符串,该字符串使用空格作为单词、符号等之间的间隔符。然而由于用户操作的问题,在录入间隔符时,可能输入了多个空格,现要求对输入的字符串进行处理,清除字符串的首尾空格,并且确保字符串中的间隔符只能有一个空格

查看代码
package java_works;

import java.util.Scanner;

public class java_10011 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		String str = sc.nextLine();
		guiFanhua(str);
	}
	public static void guiFanhua(String s) {
		s=s.trim();                      //去除字符串首尾空格字符
		StringBuffer sb = new StringBuffer();
		int flag;
		for(int i=0;i<s.length();i++)
		{
			flag = 0;
			if(s.charAt(i)!=' ')
				sb.append(s.charAt(i));
			else {
				flag = 1;
			}try {
				if(s.charAt(i)==' '&&s.charAt(i+1)!=' ') {
					sb.append(' ');
				}
			}catch(Exception e) {
				continue;
			}
		}
		System.out.println(sb);
	}
}

12、输入M和N,然后计算一个球从M米高度自由下落,每次落地后反跳回原高度的一半,再落下,再反弹。计算它在第N次落地时共经过多少米?第N次落地时反弹多高

查看代码
package java_works;

import java.util.Scanner;

public class java_10012 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int M = sc.nextInt();
		int N = sc.nextInt();
		Solve(M,N);
	}
	public static void Solve(int a,int b) {
		double L = 0.0,H = 0.0;
		for(int i=1;i<b;i++)
		{
			L=L+a/(Math.pow(2, i-1));
		}
		H=a/(Math.pow(2,b));
		System.out.printf("%.5f\n",L+a);
		System.out.printf("%.5f",H);
	}

}

13、输入正整数N,用1,2,3,..,N数字给N个学生编号,N个学生围成一圈。然后从第1个人开始报数(从 1 到 5 报数),凡报到 5的人退出圈子,问最后留下的是原来第几号的那位?

查看代码
package java_works;

import java.util.Scanner;

public class java_10013 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int N = -1;
		N = sc.nextInt();
		Solves(N);
	}
	public static void Solves(int a) {
		int[] b = new int[a];
		for(int i=0;i<a;i++)
		{
			b[i]=i+1;
		}
		int currentNum = 1;
		int count = b.length;
		for(int i=0;;i++)
		{
			if(count==1) {
				break;
			}
			if(i>=b.length) {
				i=0;
			}
			if(b[i]==0) {
				continue;
			}
			if(currentNum % 5 == 0) {
				count--;
				b[i]=0;
			}
			if(currentNum == 5) {
				currentNum = 1;
			}
			else {
				currentNum++;
			}
		}
		for(int i=0;i<b.length;i++)
		{
			if(b[i]!=0) {
				System.out.println(b[i]);
			}
		}
	}

}

14、输入某年某月某日,输出这一天是这一年的第几天。要特别注意闰年的判断,并且处理好闰年的情况输入一行字符串,统计并输出字符串中每个字符出现的次数

查看代码
package java_works;

import java.util.Scanner;

import java.util.GregorianCalendar;

public class java_10014 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int year = 0,month = 0, day = 0;
		year = sc.nextInt();
		month = sc.nextInt();
		day = sc.nextInt();
		Solves(year,month,day);
	}
	public static void Solves(int n,int y,int r) {
		GregorianCalendar gre = new GregorianCalendar();//判断是否为闰年的方法
		boolean isLeapYear = gre.isLeapYear(n);//返回值是true,说明是润年,若返回值是false,则不是闰年
		int ap = isLeapYear?29:28;//判断2月份的天数
		int days=0;
		switch(y) {
		case 1:
			days=r;
			break;
		case 2:
			days=31+r;
			break;
		case 3:
			days=31+ap+r;
			break;
		case 4:
			days=31+ap+31+r;
			break;
		case 5:
			days=31+ap+31+30+r;
			break;
		case 6:
			days=31+ap+31+30+31+r;
			break;
		case 7:
			days=31+ap+31+30+31+30+r;
			break;
		case 8:
			days=31+ap+31+30+31+30+31+r;
			break;
		case 9:
			days=31+ap+31+30+31+30+31+31+r;
			break;
		case 10:
			days=31+ap+31+30+31+30+31+31+30+r;
			break;
		case 11:
			days=31+ap+31+30+31+30+31+31+30+31+r;
			default:
				days=31+ap+31+30+31+30+31+31+30+31+30+r;
		}
		System.out.println(days);
	}

}

15、输入一行字符串,统计并输出字符串中每个字符出现的次数

查看代码
package java_works;

import java.util.Iterator;

import java.util.Scanner;

import java.util.TreeMap;

import java.util.Set;

public class java_10015 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		String str = sc.nextLine();
		char[] ch = str.toCharArray();
		method(ch);
		int blank = 0;
		for(int i=0;i<ch.length;i++)
		{
			if(ch[i]==' ')
				blank++;
		}
		System.out.println("空格:"+blank);
	}
	public static void method(char[] array) {
		//初始化一个长度为26的整型数组,初始值全为0,记录字符串中各个字符出现的次数
		int[] temp = new int[26];
		for(int i=0;i<temp.length;i++)
		{
			temp[i]=0;
		}
		//遍历字符数组,将其值对应的ASCII值作为整型数组下标
		for(int i=0;i<array.length;i++)
		{
			if(array[i]>='a'&&array[i]<='z')
			{
				temp[array[i]-'a']++;
			}
		}
		//打印输出每个小写英文字母及出现的次数
		for(int i=0;i<temp.length;i++)
		{
			System.out.println((char)(i+'a')+":"+temp[i]);
		}
	}
}	

16、输入一行字符串,输出最先出现重复的字符

查看代码
package java_works;

import java.util.Scanner;

public class java_10016 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		String str = sc.nextLine();
		getFirstIndex(str);
	}
	public static void getFirstIndex(String s) {
		String[] a = s.split("");
		for(int i=0;i<a.length;i++) {
			int num = 0;
			int index = 0;
			while(index<=i) {
				if(a[index].equals(a[i])) {
					num++;
				}
				index++;
			}
			if(num>1) {
				System.out.println(a[i]);
				break;
			}
		}
		
	}
	
}

17、输入一个正整数N,对它进行质因数分解并输出结果。例如:输入 90,打印出 90=2*3*3*5

查看代码
package java_works;

import java.util.Scanner;

public class java_10017 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int N = -1;
		N = sc.nextInt();
		Solve(N);
	}
	public static void Solve(int a) {
		System.out.print(a+"=");
		for(int i=2;i<a+1;i++) {
			while(a%i==0&&a!=i) {
				a/=i;
				System.out.print(i+"*");
			}
			if(a==i) {
				System.out.println(i);
				break;
			}
		}
	}
}

18、输入一个正整数N,输出[1, N]之间的“完数”。“完数”就是如果这个数恰好等于它的因子之和,则这个数就称为"完数",例如6=1+2+3

查看代码
package java_works;

import java.util.Scanner;

public class java_10018 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int N = -1;
		N = sc.nextInt();
		Solve(N);
	}
	public static void Solve(int a) {
		
		for(int i=1;i<a;i++)
		{
			int sum = 0;
			for(int j=1;j<=i/2;j++)
			{
				if(i % j == 0)
				{
					sum+=j;
				}
			}
			if(sum == i)
			{
				System.out.print(i+" ");
			}
			
		}
		
	}
}

19、输入一行字符串,按照规格压缩,输出压缩后的字符串。压缩规格为:相同字符连续,则压缩为“字符+数字个数”,如"iamaaaaaAbcCCdD压缩为"iama5AbcC2dD"。

查看代码
package java_works;

import java.util.Scanner;

public class java_10019 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		String str = sc.nextLine();
		compressStr(str);
	}
	public static void compressStr(String s) {
		StringBuilder sb = new StringBuilder();
		int count = 1;
		char c1=s.charAt(0);
		for(int i=1;i<s.length();i++)
		{
			char c2 = s.charAt(i);
			if(c1 == c2) {
				count++;
				continue;
			}
			if(count>1) {
				sb.append(c1).append(count);
			}else {
				sb.append(c1);
			}
			c1 = c2;
			count = 1;
		}
		if(count >1) {
			sb.append(c1).append(count);
		}else {
			sb.append(c1);
		}
		System.out.println(sb.toString());
	}
}

20、指令分割。输入正整数N,然后输入N行字符串,每一行字符串为一条指令。

查看代码
package java_works;

import java.util.Scanner;

public class java_10020 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int N = -1;
		N = Integer.parseInt(sc.nextLine());
		String[] a = new String[N];
		for(int i=0;i<N;i++)
		{
			a[i] = sc.nextLine().replace(" ","");
		}
		sc.close();
		String[] singleArr = {"printi","jg","jl","je","jne","jmp"};
		String[] doubleArr = {"mov","add","sub","mul","div","cmp"};
		for(int i=0;i<N;i++) {
			int flag = 0;
			for(String tmp:singleArr)
			{
				if(a[i].indexOf(":"+tmp)>0)
				{
					flag = 1;
					String[] tmpStrArr = a[i].split(":"+tmp);
					System.out.println("LineNo="+tmpStrArr[0]);
					System.out.println("OP="+tmp);
					System.out.println("N1="+tmpStrArr[1]);
				}
			}
			if(flag == 0){
				for(String tmp:doubleArr)
				{
					if(a[i].indexOf(":"+tmp)>0) {
						flag = 2;
						String[] tmpStrArr = a[i].split(":"+tmp);
						System.out.println("LineNo="+tmpStrArr[0]);
						System.out.println("OP="+tmp);
						System.out.println("N1="+tmpStrArr[1].split(",")[0]);
						System.out.println("N2="+tmpStrArr[1].split(",")[1]);
					}
				}
			}
			if(flag == 0)
				return;
		}
	}

}

21、二进制指令序列解码成字符串源代码。输入一行字符串,输入的字符串为二进制指令序列的16进制形式字符串


22、抱歉,忘记写了,题目也给忘了,索性摆烂。。。


23、输入正整数N,然后输入N*N个正整数按一行一行的顺序排列成N行N列的矩阵,要求对矩阵按垂直方向翻转,并输出结果

查看代码
import java.util.Scanner;

public class java_10023 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int[][] a = new int[N][N];
		for(int i = 0;i < N; i++)
			for(int j = 0;j < N;j++)
			{
				a[i][j] = sc.nextInt();
			}
 		//实现垂直翻转矩阵
		for(int i = N - 1;i > -1;i--)
 		{
 			for(int j = 0;j < N;j++)
 			{
 				System.out.print(a[i][j]+" ");
 			}
 			System.out.println();
 		}
 			
	}

}

24、老式手机健盘上有1, 2, ..., 8, 9, 0键,其中每个键都代表多个字母,且0代表空格。输入一行只含字母和空格的字符串,将字符串转为成手机键盘按键序号,并输出结果

查看代码
import java.util.Scanner;

public class java_10024 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		String sentence = sc.nextLine();
		char[] a = sentence.toCharArray();
		for(int i = 0;i < a.length;i++)
		{
			if(a[i] >= 97 && a[i] <= 99)
				a[i] = '2';
			else if(a[i] >= 100 && a[i] <= 102)
				a[i] = '3';
			else if(a[i] >= 103 && a[i] <= 105)
				a[i] = '4';
			else if(a[i] >= 106 && a[i] <= 108)
				a[i] = '5';
			else if(a[i] >= 109 && a[i] <= 111)
				a[i] = '6';
			else if(a[i] >= 112 && a[i] <= 115)
				a[i] = '7';
			else if(a[i] >= 116 && a[i] <= 118)
				a[i] = '8';
			else if(a[i] >= 119 && a[i] <= 122)
				a[i] = '9';
			else if(a[i] == 32)
				a[i] = '0';
			System.out.print(a[i]);
		}
	}

}

25、输入一个正整数N,然后输入一个[2, 16]之间的数K,请把N转化为K进制的数,并输出结果

查看代码
import java.util.Scanner;

public class java_10025 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int K = sc.nextInt();
		if(K < 2 || K > 16)
			return;
		//实现任意进制之间的相互转换
		String s = Integer.toString(N,K);
		System.out.println(s.toUpperCase());
	}

}

26、用散列表(哈希表)建立城市名主健与电话号码区号的映射,

查看代码
import java.util.HashMap;

import java.util.Scanner;

public class java_10026 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		HashMap<String,String> code = new HashMap<String,String>();
		Scanner sc = new Scanner(System.in);
		int N = Integer.parseInt(sc.nextLine());
		//将城市名主键和电话号码区号建立映射存储在哈希表中
		for(int i = 0;i < N;i++)
		{
			String tempStr = sc.nextLine();
			String tempStrArr[] = tempStr.split(" ");
			code.put(tempStrArr[0], tempStrArr[1]);
		}
		int IN = Integer.parseInt(sc.nextLine());
		String[] cityKey = new String[IN];
		for(int i = 0;i < IN;i++)
		{
			String tempStr = sc.nextLine();
			cityKey[i] = tempStr;
		}
		sc.close();
		for(int i = 0;i < IN;i++)
		{
			System.out.println(cityKey[i] + " " + code.get(cityKey[i]));
		}
	}

}

27、请你定义一个类Student,表示学生,并实现相应的功能

查看代码
import java.util.*;

import java.io.*;

public class java_10027 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		class Student{
			String Name;//姓名
			Double NGrade;//平时成绩
			Double EGrade;//考试成绩
			public Student(String Name,Double NGrade,Double EGrade){
				super();
				this.Name = Name;
				this.NGrade = NGrade;
				this.EGrade = EGrade;
			}
			
			public Student() {
				// TODO Auto-generated constructor stub
			}

			public String getName() {
				return this.Name;
			}
			public void setName(String Name) {
				this.Name = Name;
			}
			public Double getNGrade() {
				return NGrade;
			}
			public void setNGrade(Double NGrade) {
				this.NGrade = NGrade;
			}
			public double sumGrade(Student s) {
				return this.NGrade * 0.3 + this.EGrade * 0.7;
			}
			public boolean CompareTS(Student s) {
				 Double in = this.sumGrade();
			        Double out = s.sumGrade();
			        if (in > out)
			            return true;
			        else if (in == out)
			            return true;
			        else
			            return false;
			}
			private Double sumGrade() {
				// TODO Auto-generated method stub
				return null;
			}

			public void ToString(Student s) {
				System.out.printf("姓名:"+s.Name+"\n平时成绩:"+s.NGrade+"\n考试成绩:"+s.EGrade+"\n总成绩:"+sumGrade(s)+"\n");
			}
		}
		
	}

}

28、哎呀,题目又没写。。。

查看代码
import java.io.*;

import java.util.*;

class Complex{
	double real;
	double image;
	public Complex(double real,double image) {
		this.real = real;
		this.image = image;
	}
	public Complex(Complex c) {
		this.real = c.real;
		this.image = c.image;
	}
	public double getReal() {
		return real;
	}
	public double getImage() {
		return image;
	}
	public void setReal(double real) {
		this.real = real;
	}
	public void setImage(double image) {
		this.image = image;
	}
	public String toString() {
		return "(" + String.format("%.5f", real) + ")" + "+" + "(" + String.format("%.5f", image) + ")" + "i";
	}
	public Complex add(Complex c) {
		return new Complex( this.real + c.real, this.image + c.image );
	}
	public Complex sub(Complex c) {
		return new Complex( this.real - c.real, this.image - c.image );
	}
	public Complex multiply( Complex C ) {
		double newa = this.real * C.real - this.image * C.image; // 新建一个 实部
		double newb = this.real * C.image + this.image * C.real; // 新建一个 虚部
		return new Complex( newa, newb );
	}
	public Complex exp( ) {
		return new Complex( Math.exp(this.real) * Math.cos(this.image),
		Math.exp(this.real) * Math.sin(this.image) );
	}
	public double abs( ) {
		return Math.sqrt( this.real * this.real + this.image * this.image );
	} 
}

29、Rectangle实体类

查看代码
import java.io.*;

import java.util.*;

class Rect {
	Double x;//X坐标
	Double y;//Y坐标
	Double L;//矩形长
	Double W;//矩形宽度
	public Rect(Double x,Double y,Double l,Double w) {
		this.x = x;
		this.y = y;
		this.L = l;
		this.W = w;
	}
	public Rect(Rect r) {
		// TODO Auto-generated constructor stub
		this.x = r.x;
		this.y = r.y;
		this.L = r.L;
		this.W = r.W;
	}
	public Double getX() {
		return this.x;
	}
	public void setX(Double x) {
		this.x = x;
	}
	public Double getY() {
		return this.y;
	}
	public void setY(Double y) {
		this.y = y;
	}
	public Double getL() {
		return this.L;
	}
	public void setL(Double l) {
		this.L = l;
	}
	public Double getW() {
		return this.W;
	}
	public void setW(Double w) {
		this.W = w;
	}
	public Double Area() {
		return L * W;
	}
	public int CompareArea(Rect r) {
		Double a = this.Area();
		Double b = r.Area();
		if(a > b)
			return 1;
		else if(a == b)
			return 0;
		else
			return -1;
	}
	public String  toString() {
		return (String.format("x:%.5f",x) +"\n" + String.format("y:%.5f", y) + "\n" + String.format("L:%.5f", L)+ "\n" + String.format("W:%.5f", W) +"\n" + String.format("面积:%.5f", this.Area()));
	}
}

30、请你定义一个类Circle,表示圆。要求实现相应的功能

查看代码
public class java_10030 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		/* 构造函数参数按顺序为:x, y, r */
		Circle rc1 = new Circle(10.01, 20.0, 30.0);
		Circle rc2 = new Circle(rc1);

		System.out.println(String.valueOf(rc1.getX()));
		System.out.println(String.valueOf(rc1.getY()));
		System.out.println(String.valueOf(rc1.getR()));

		rc2.setX(40.66);
		rc2.setY(58.18);
		rc2.setR(28.98);

		/* 比较面积,如果rc2面积更大则输出1, 相等输出0,否则输出-1; */
		System.out.println(String.valueOf(rc2.CompareCS(rc1)));
		
		/* 比较周长,如果rc2周长更长则输出1, 相等输出0,否则输出-1; */
		System.out.println(String.valueOf(rc2.CompareCL(rc1)));
		System.out.println(String.valueOf(rc2.toString()));
	}

}

31、。。。

import java.io.*;

import java.util.*;

class CUser {
	String userName;
	String passWord;
	public CUser(String u,String p) {
		this.userName = u;
		this.passWord = p;
	}
	public String getUserName() {
		return this.userName;
	}
	public void setUserName(String u) {
		this.userName = u;
	}
	public String getPassWord() {
		return this.passWord;
	}
	public void setPassWord(String p) {
		this.passWord = p;
	}
	public String Login(String InUserName,String InPassWord) {
		if(userName.equals(InUserName) && passWord.equals(InPassWord))
			return "登录成功";
		else
			return "登陆失败";
	}
}

32、。。。

查看代码
import java.io.*;

import java.util.*;

interface IReadBook {
	void ReadBook();
}
class CBauStu implements IReadBook{
	public void ReadBook() {
		System.out.println("本科生读教材");
	}
}
class CGduStu implements IReadBook{
	public void ReadBook() {
		System.out.println("硕士生读中文学术期刊");
	}
}
class CDocStu implements IReadBook{
	public void ReadBook() {
		System.out.println("博士生读外文学术期刊");
	}
}

33、直接看代码吧

查看代码
import java.io.*;

import java.util.*;

interface ICry{
	void Cry();
}
class CFrog implements ICry{
	public void Cry() {
		System.out.println("青蛙哇哇叫");
	}
}
class CDog implements ICry{
	public void Cry() {
		System.out.println("小狗汪汪叫");
	}
}
class CCat implements ICry{
	public void Cry() {
		System.out.println("小猫喵喵叫");
	}
}

34、

查看代码
public class java_10034 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Integer[] li = new Integer[] {100, 20, 32, 196, 85};
		 Integer iv = CommonFun.getMax(li);   //返回iv值为196  
		 System.out.println(iv);
		  
		 Double[] ld = new Double[] {51.0, 10.6, 165.2, 12.0, 82.0};
		 Double dv = CommonFun.getMax(ld);   //返回dv值为165.2 
		 System.out.println(dv);
	}

}

35、

import java.util.Scanner;

public class java_10035 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		String[][] Student = new String[N][6];
		for(int i = 0;i < N;i++)
		{
			int sum =0;
			for(int j = 0;j < 4;j++)
			{
				Student[i][j] = sc.next();
			}
			sum = Integer.parseInt(Student[i][1]) + Integer.parseInt(Student[i][2]) + Integer.parseInt(Student[i][3]);
			Student[i][4] = "" + sum;
			Student[i][5] = "" + i;
		}
		//排序
		for(int i = 0;i < N -1;i++)
		{
			for(int j = N -1;j > i;j--)
			{
				if(Integer.parseInt(Student[i][4]) < Integer.parseInt(Student[j][4]))
				{
					String[] tempArr = Student[i];
					Student[i] = Student[j];
					Student[j] = tempArr;
				}else if(Integer.parseInt(Student[i][4]) == Integer.parseInt(Student[j][4]))
				{
					if(Integer.parseInt(Student[i][5]) > Integer.parseInt(Student[j][5]))
					{
						String[] tempArr = Student[i];
						Student[i] = Student[j];
						Student[j] = tempArr;
					}
				}
			}
		}
		for(int i = 0;i < N;i++)
		{
			for(int j = 0;j < 5;j++)
			{
				System.out.print(Student[i][j] + " ");
			}
			System.out.println();
		}
	}
}

36、

import java.util.Scanner;

public class java_10036 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		String[][] Student = new String[N][6];
		for(int i = 0;i < N;i++)
		{
			int sum =0;
			for(int j = 0;j < 4;j++)
			{
				Student[i][j] = sc.next();
			}
			sum = Integer.parseInt(Student[i][1]) + Integer.parseInt(Student[i][2]) + Integer.parseInt(Student[i][3]);
			Student[i][4] = "" + sum;
			Student[i][5] = "" + i;
		}
		//排序
		for(int i = 0;i < N -1;i++)
		{
			for(int j = N -1;j > i;j--)
			{
				if(Integer.parseInt(Student[i][4]) < Integer.parseInt(Student[j][4]))
				{
					String[] tempArr = Student[i];
					Student[i] = Student[j];
					Student[j] = tempArr;
				}else if(Integer.parseInt(Student[i][4]) == Integer.parseInt(Student[j][4]))
				{
					if(Integer.parseInt(Student[i][1]) < Integer.parseInt(Student[j][1]))
					{
						String[] tempArr = Student[i];
						Student[i] = Student[j];
						Student[j] = tempArr;
					}else if(Integer.parseInt(Student[i][1]) == Integer.parseInt(Student[j][1])) {
						if(Integer.parseInt(Student[i][5]) > Integer.parseInt(Student[j][5]))
						{
							String[] tempArr = Student[i];
							Student[i] = Student[j];
							Student[j] = tempArr;
						}
					}
				}
			}
		}
		for(int i = 0;i < N;i++)
		{
			for(int j = 0;j < 5;j++)
			{
				System.out.print(Student[i][j] + " ");
			}
			System.out.println();
		}
	}

}

37、

import java.util.Scanner;

public class java_10037 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		String[][] Student = new String[N][6];
		for(int i = 0;i < N;i++)
		{
			int sum =0;
			for(int j = 0;j < 4;j++)
			{
				Student[i][j] = sc.next();
			}
			sum = Integer.parseInt(Student[i][1]) + Integer.parseInt(Student[i][2]) + Integer.parseInt(Student[i][3]);
			Student[i][4] = "" + sum;
			Student[i][5] = "" + i;
		}
		//排序
		for(int i = 0;i < N -1;i++)
		{
			for(int j = N -1;j > i;j--)
			{
				if(Integer.parseInt(Student[i][4]) < Integer.parseInt(Student[j][4]))
				{
					String[] tempArr = Student[i];
					Student[i] = Student[j];
					Student[j] = tempArr;
				}else if(Integer.parseInt(Student[i][4]) == Integer.parseInt(Student[j][4]))
				{
					if(Integer.parseInt(Student[i][1]) < Integer.parseInt(Student[j][1]))
					{
						String[] tempArr = Student[i];
						Student[i] = Student[j];
						Student[j] = tempArr;
					}else if(Integer.parseInt(Student[i][1]) == Integer.parseInt(Student[j][1])) {
						if(Integer.parseInt(Student[i][2]) < Integer.parseInt(Student[j][2]))
						{
							String[] tempArr = Student[i];
							Student[i] = Student[j];
							Student[j] = tempArr;
						}else if(Integer.parseInt(Student[i][2]) == Integer.parseInt(Student[j][2]))
							if(Integer.parseInt(Student[i][5]) > Integer.parseInt(Student[j][5]))
							{
								String[] tempArr = Student[i];
								Student[i] = Student[j];
								Student[j] = tempArr;
							}
					}
				}
			}
		}
		for(int i = 0;i < N;i++)
		{
			for(int j = 0;j < 5;j++)
			{
				System.out.print(Student[i][j] + " ");
			}
			System.out.println();
		}
	}

}

38、

import java.util.Scanner;

public class java_10038 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		String[][] Student = new String[N][6];
		for(int i = 0;i < N;i++)
		{
			int sum =0;
			for(int j = 0;j < 4;j++)
			{
				Student[i][j] = sc.next();
			}
			sum = Integer.parseInt(Student[i][1]) + Integer.parseInt(Student[i][2]) + Integer.parseInt(Student[i][3]);
			Student[i][4] = "" + sum;
			Student[i][5] = "" + i;
		}
		//排序
		for(int i = 0;i < N -1;i++)
		{
			for(int j = N -1;j > i;j--)
			{
				if(Integer.parseInt(Student[i][4]) < Integer.parseInt(Student[j][4]))
				{
					String[] tempArr = Student[i];
					Student[i] = Student[j];
					Student[j] = tempArr;
				}else if(Integer.parseInt(Student[i][4]) == Integer.parseInt(Student[j][4]))
				{
					if(Integer.parseInt(Student[i][1]) < Integer.parseInt(Student[j][1]))
					{
						String[] tempArr = Student[i];
						Student[i] = Student[j];
						Student[j] = tempArr;
					}else if(Integer.parseInt(Student[i][1]) == Integer.parseInt(Student[j][1])) {
						if(Integer.parseInt(Student[i][2]) < Integer.parseInt(Student[j][2]))
						{
							String[] tempArr = Student[i];
							Student[i] = Student[j];
							Student[j] = tempArr;
						}else if(Integer.parseInt(Student[i][2]) == Integer.parseInt(Student[j][2]))
							if(Student[i][0].compareTo(Student[j][0]) > 0)
							{
								String[] tempArr = Student[i];
								Student[i] = Student[j];
								Student[j] = tempArr;
							}
					}
				}
			}
		}
		for(int i = 0;i < N;i++)
		{
			for(int j = 0;j < 5;j++)
			{
				System.out.print(Student[i][j] + " ");
			}
			System.out.println();
		}
	}

}

39、

import java.io.*;

import java.util.Scanner;

public class java_10039 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		String str = sc.nextLine();
		int flag = -1 , i = 0;
		char[] ch = str.toCharArray();
		while(i < str.length()/2)
		{
			if(ch[i] != ch[str.length() -1 -i])
			{
				flag = 0;
				break;
			}
			i++;
		}
		if(flag ==-1)
		{
			flag = 1;
		}
		System.out.println(flag);
	}

}

40、

import java.util.Scanner;

public class java_10040 {	
	public String longStr(String s)
	{
		if(s.length() < 2)
			return s;
		int max_len = 1;
		int start = 0;
		//dp[i][j]表示s[i][j]是否是回文串
		boolean[][] dp = new boolean[s.length()][s.length()];
		//初始化,所有长度为1的字串都是回文串
		for(int i = 0;i < s.length();i++)
		{
			dp[i][i] = true;
		}
		char[] charArr = s.toCharArray();
		//递推开始
		//先枚举字串长度
		for(int l = 2;l <= s.length();l++)
		{
			//枚举左边界
			for(int i = 0;i < s.length();i++)
			{
				int j = l + i - 1;
				//如果右边越界,则退出循环
				if(j >= s.length())
					break;
				if(charArr[i] != charArr[j]) {
					dp[i][j] = false;
				}
				else {
					if(j - i < 3) {
						dp[i][j] = true;
					}
					else {
						dp[i][j] = dp[i + 1][j - 1];
					}
				}
				//只要dp[j][k] == true成立,就表示子串s[i][j]是回文
				if(dp[i][j] && j - i + 1 > max_len) {
					max_len = j - i + 1;
					start = i;
				}
			}
		}
		return s.substring(start,start + max_len);
	}
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		String str = sc.nextLine();
		java_10040 solution = new java_10040();
		System.out.println(solution.longStr(str));
	}
}

41、输入正整数N和K,然后输入N个浮点数,要求输出它们中第K大的数

查看代码
import java.util.Scanner;

public class java_10041 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int K = sc.nextInt();
		Double Temp;
		Double[] Arr = new Double[N];
		for(int i = 0; i < Arr.length;i++)
		{
			Arr[i] = sc.nextDouble();
		}
		//利用冒泡排序法对数组进行排序
		for(int i = 0;i < Arr.length - 1 ;i++)
		{
			for(int j = 0;j <Arr.length - i - 1;j++)
			{
				if(Arr[j] < Arr[j + 1])
				{
					Temp = Arr[j];
					Arr[j] = Arr[j + 1];
					Arr[j + 1] = Temp;
				}
			}
		}
		System.out.printf("%.5f",Arr[K-1]);
	}

}

42、输入正整数N,然后输入N个浮点数组成的向量A,再输入N个浮点数组成的向量B,要求计算并输出A+B。

查看代码
import java.util.Scanner;

public class java_10042 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		Double[] A = new Double[N];
		Double[] B = new Double[N];
		for(int i = 0; i < N;i++)
		{
			A[i] = sc.nextDouble();
		}
		for(int i = 0; i < N;i++)
		{
			B[i] = A[i] + sc.nextDouble();
		}
		for(int i = 0;i < N;i++)
		{
			System.out.print(String.format("%.5f" + " ", B[i]));
		}
	}

}

43、输入正整数N,然后输入N个浮点数组成的向量A,再输入N个浮点数组成的向量B,要求计算并输出A-B。

查看代码
import java.util.Scanner;

public class java_10043 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		Double[] A = new Double[N];
		Double[] B = new Double[N];
		for(int i = 0; i < N;i++)
		{
			A[i] = sc.nextDouble();
		}
		for(int i = 0; i < N;i++)
		{
			B[i] = A[i] - sc.nextDouble();
		}
		for(int i = 0;i < N;i++)
		{
			System.out.print(String.format("%.5f" + " ", B[i]));
		}
	}

}

44、输入正整数N,然后输入N个浮点数组成的向量A,再输入N个浮点数组成的向量B,要求计算并输出向量A和B之间的欧氏距离

查看代码
import java.util.Scanner;

public class java_10044 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		Double[] A = new Double[N];
		Double[] B = new Double[N];
		Double sum = 0.0;
		for(int i = 0;i < N;i++)
		{
			A[i] = sc.nextDouble();
		}
		for(int i = 0;i < N;i++)
		{
			 B[i]= sc.nextDouble();
			sum += Math.pow(A[i] - B[i] , 2);
		}
		sum = Math.sqrt(sum);
		System.out.println(String.format("%.5f",sum));
	}

}

45、输入正整数N和K,然后输入一个由N个浮点数组成的向量A,再输入K个同样维度的向量,要求在K个向量中找出与向量A的欧氏距离最小的向量,并输出找到的向量与向量A的欧氏距离

查看代码
import java.util.Scanner;

public class java_10045 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int K = sc.nextInt();
		Double[] A = new Double[N];
		
		for(int i = 0;i < A.length;i++)
		{
			A[i] = sc.nextDouble();
		}
		Double[][] B = new Double[K][N];
		for(int i = 0;i < B.length;i++)
		{
			for(int j = 0;j < B[i].length;j++)
			{
				B[i][j] = sc.nextDouble();
			}
		}
		//求欧氏距离
		
		Double[] V = new Double[K];
		for(int i = 0;i < K;i++)
		{
			double value = 0;
			for(int j = 0;j < N;j++)
			{
				value += Math.pow(A[j] - B[i][j],2);
			}
			V[i] = Math.sqrt(value);
		}
		//寻找与向量A的欧氏距离最小的向量
		double minValue = V[0];
		for(int i = 1 ;i < V.length;i++)
		{
			if(V[i] < minValue)
				minValue = V[i];
		}
		System.out.printf("%.5f",minValue);
	}
}

46、输入正整数N和K,然后输入K个向量,其中每个向量由N个浮点数组成。现要求在K个向量中找出欧氏距离最小的两个向量,并输出找到的这两个向量之间的欧氏距离

查看代码
import java.util.Scanner;

public class java_10046 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int K = sc.nextInt();
		double sum = 0.0;
		double minSum = Double.MAX_VALUE;
		int minI = -1;
		int minJ = -1;
		Double[][] data= new Double[K][N];
		for(int i = 0;i < K;i++)
		{
			for(int j = 0 ;j < N;j++)
			{
				data[i][j] = sc.nextDouble();
			}
		}
		for(int i = 0 ;i < K;i++)
		{
			for(int j = i + 1;j < K;j++)
			{
				sum = 0.0;
				for(int m = 0;m < N;m++)
				{
					sum = sum + Math.pow(data[i][m] - data[j][m],2);
				}
				sum = Math.sqrt(sum);
				if(sum < minSum)
				{
					minSum = sum;
					minI =i;
					minJ = j;
				}
			}
		}
		System.out.format("%.5f",minSum);
	}
}

47、。。。


48、。。。

import java.util.Scanner;

public class java_10048 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		Double[] M = new Double[N];
		Double[] A = new Double[N];
		Double[] B = new Double[N];
		Double[] R = new Double[N];
		for(int i = 0;i < N;i++)
		{
			M[i] = sc.nextDouble();
		}
		for(int i = 0;i < N;i++)
		{
			A[i] = sc.nextDouble();
		}
		for(int i = 0;i < N;i++)
		{
			B[i] = sc.nextDouble();
		}
		for(int i = 0;i < N;i++)
		{
			if(M[i] < 0.5)
			{
				R[i] = A[i];
			}
			else
			{
				R[i] = B[i];
			}
		}
		for(int i = 0;i < N;i++)
		{
			System.out.format("%.5f" + " ", R[i]);
		}
	}

}

49、。。。

import java.util.Scanner;
	
	public class java_10049 {
	
		public static void main(String[] args) {
			// TODO Auto-generated method stub
			Scanner sc = new Scanner(System.in);
			int N1 = sc.nextInt();
			int C1 = sc.nextInt();
			int N2 = sc.nextInt();
			int C2 = sc.nextInt();
			Double[][] A = new Double[N1][C1];
			Double[][] B = new Double[N2][C2];
			for(int i = 0;i < N1;i++)
			{
				for(int j = 0;j < C1;j++)
				{
					A[i][j] = sc.nextDouble();
				}
			}
			for(int i = 0;i < N2;i++)
			{
				for(int j = 0;j < C2;j++)
				{
					B[i][j] = sc.nextDouble();
				}
			}
			for(int i = 0;i < N1;i++)
			{
				for(int j = 0;j < C2;j++)
				{
					Double sum = 0.0;
					for(int k = 0;k < C1;k++)
					{
						sum = sum + A[i][k]*B[k][j];
					}
					System.out.format("%.5f" + " ", sum);
				}
				System.out.println();
			}
		}
	
	}

50、51、没写啊哈哈哈哈哈哈


52、。。。

import java.util.Scanner;

public class java_10052 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int C = sc.nextInt();
		Double[][] M = new Double[N][C];
		Double[][] A = new Double[N][C];
		Double[][] B = new Double[N][C];
		Double[][] R = new Double[N][C];
		for(int i = 0;i < N;i++)
		{
			for(int j = 0;j < C;j++)
			{
				M[i][j] = sc.nextDouble();
			}
		}
		for(int i = 0;i < N;i++)
		{
			for(int j = 0;j < C;j++)
			{
				A[i][j] = sc.nextDouble();
			}
		}
		for(int i = 0;i < N;i++)
		{
			for(int j = 0;j < C;j++)
			{
				B[i][j] = sc.nextDouble();
			}
		}
		
		for(int i = 0;i < N;i++)
		{
			for(int j = 0;j < C;j++)
			{
				if(M[i][j] < 0.5)
				{
					R[i][j] = A[i][j];
				}
				else
				{
					R[i][j] = B[i][j];
				}
			}
		}
		for(int i = 0;i < N;i++)
		{
			for(int j = 0;j < C;j++)
			{
				System.out.format("%.5f" + " ", R[i][j]);
			}
			System.out.println();
		}
	}

}

53、。。

import java.util.Scanner;

public class java_10053 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int[][] data = new int[N][N];
		for(int i = 0;i < N;i++)
		{
			for(int j = 0;j < N;j++)
			{
				data[i][j] = sc.nextInt();
			}
		}
		for(int i = 0;i < N;i++)
		{
			for(int j = N - 1;j > -1;j--)
			{
				System.out.print(data[i][j] + " ");
			}
			System.out.println();
		}
	}

}

54、。。。

import java.util.Scanner;

public class java_10054 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int[][] data = new int[N][N];
		for(int i = 0;i < N;i++)
		{
			for(int j = 0;j < N;j++)
			{
				data[i][j] = sc.nextInt();
			}
		}
		for(int i = N - 1;i > -1;i--)
		{
			for(int j = N - 1;j > -1;j--)
			{
				System.out.print(data[j][i] + " ");
			}
			System.out.println();
		}
	}

}

55、。。。

import java.util.Scanner;

public class java_10055 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int[][] data = new int[N][N];
		for(int i = 0;i < N;i++)
		{
			for(int j = 0;j < N;j++)
			{
				data[i][j] = sc.nextInt();
			}
		}
		for(int i = 0;i < N;i++)
		{
			for(int j = N - 1;j > -1;j--)
			{
				System.out.print(data[j][i] + " ");
			}
			System.out.println();
		}
	}

}

56、

import java.util.Scanner;

public class java_10055 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int[][] data = new int[N][N];
		for(int i = 0;i < N;i++)
		{
			for(int j = 0;j < N;j++)
			{
				data[i][j] = sc.nextInt();
			}
		}
		for(int i = 0;i < N;i++)
		{
			for(int j = N - 1;j > -1;j--)
			{
				System.out.print(data[j][i] + " ");
			}
			System.out.println();
		}
	}

}

57、忘写了 OvO


58、

import java.util.Scanner;

public class java_10058 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int count = 0;
		String str = sc.nextLine();
		for(int i = 0;i < str.length();i++)
		{
			if(count < 0)
				break;
			String temp = str.substring(i,i + 1);
			if(temp.equals("("))
				count ++;
			if(temp.equals(")"))
				count --;
		}
		if(count == 0)
			System.out.println(1);
		else
			System.out.println(0);
	}

}

59、

import java.util.Scanner;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;
import java.util.Stack;

public class java_10059 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		@SuppressWarnings("resource")
		Scanner sc=new Scanner(System.in);
		String str=sc.nextLine();
		BigDecimal result=cal(str);
		System.out.format("%.5f\n",result);
	}
	public static BigDecimal cal(String str)
	{
		List<String> list=new ArrayList<>();
		char[] arr=str.toCharArray();
		StringBuffer sb=new StringBuffer();
		for(char c:arr)
		{
			if(c>='0'&&c<='9') {
				sb.append(c);
			}else if(c=='.')
			{
				if(sb.indexOf(".")>0)
				{
					throw new RuntimeException("非法字符");
				}
				sb.append(c);
			}
			else if(c=='+'||c=='-'||c=='*'||c=='/'||c=='('||c==')') {
				if(sb.length()>0)
				{
					list.add(sb.toString());
					sb.setLength(0);
				}
				list.add(c+"");
			}
			else if(c==' ')
			{
				continue;
			}else {
				throw new RuntimeException("非法字符");
			}
		}
		if(sb.length()>0)
		{
			list.add(sb.toString());
		}
		List<String> strList =new ArrayList<>();
		Stack<String> stack=new Stack<>();
		String temp;
		for(String s:list)
		{
			if(s.equals("("))
			{
				stack.push(s);
			}
			else if(s.equals(")")) {
				while(!(temp=stack.pop()).equals("("))
				{
					strList.add(temp);
				}
			}
			else if (s.equals("*")||s.equals("/")) {
				while(!stack.isEmpty()) {
					temp=stack.peek();
					if(temp.equals("*")||temp.equals("/"))
					{
						stack.pop();
						strList.add(temp);
					}else {
						break;
					}
				}
				stack.push(s);
			}else if(s.equals("+")||s.equals("-"))
			{
				while(!stack.isEmpty()) {
					temp=stack.peek();
					if(!temp.equals("("))
					{
						stack.pop();
						strList.add(temp);
					}else {
						break;
					}
				}
				stack.push(s);
			}
			else {
				strList.add(s);
			}
		}
		while(!stack.isEmpty()) {
			strList.add(stack.pop());
		}
		Stack<BigDecimal>newStack=new Stack<>();
		for(String s:strList)
		{
			if(s.equals("+")||s.equals("-")||s.equals("*")||s.equals("/")) {
				BigDecimal b1=newStack.pop();
				BigDecimal b2=newStack.pop();
				switch(s){
					case "+":
					    newStack.push(b2.add(b1));
					    break;
					case "-":
						newStack.push(b2.subtract(b1));
						break;
					case "*":
						newStack.push(b2.multiply(b1));
						break;
					case "/":
						newStack.push(b2.divide(b1,9,BigDecimal.ROUND_HALF_UP));
						break;
				}
			}
			else {
				newStack.push(new BigDecimal(s));
			}
		}
		return newStack.peek();
	}

}

60、

import java.util.Scanner;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;
import java.util.Stack;

public class java_10060{
    public static void main(String[] args) throws Exception{
    	@SuppressWarnings("resource")
		Scanner sc=new Scanner(System.in);
		String str=sc.nextLine().replace(" ", "");
		BigDecimal result=cal(str);
		System.out.format("%.5f\n",result);
	}
	public static BigDecimal cal(String str)
	{
		List<String> list=new ArrayList<>();
		char[] arr=str.toCharArray();
		StringBuffer sb=new StringBuffer();
		for(char c:arr)
		{
			if(c>='0'&&c<='9') {
				sb.append(c);
			}else if(c=='.')
			{
				if(sb.indexOf(".")>0)
				{
					throw new RuntimeException("非法字符");
				}
				sb.append(c);
			}
			else if(c=='+'||c=='-'||c=='*'||c=='/'||c=='('||c==')') {
				if(sb.length()>0)
				{
					list.add(sb.toString());
					sb.setLength(0);
				}
				list.add(c+"");
			}
			else if(c==' ')
			{
				continue;
			}else {
				throw new RuntimeException("非法字符");
			}
		}
		if(sb.length()>0)
		{
			list.add(sb.toString());
		}
		List<String> strList =new ArrayList<>();
		Stack<String> stack=new Stack<>();
		String temp;
		for(String s:list)
		{
			if(s.equals("("))
			{
				stack.push(s);
			}
			else if(s.equals(")")) {
				while(!(temp=stack.pop()).equals("("))
				{
					strList.add(temp);
				}
			}
			else if (s.equals("*")||s.equals("/")) {
				while(!stack.isEmpty()) {
					temp=stack.peek();
					if(temp.equals("*")||temp.equals("/"))
					{
						stack.pop();
						strList.add(temp);
					}else {
						break;
					}
				}
				stack.push(s);
			}else if(s.equals("+")||s.equals("-"))
			{
				while(!stack.isEmpty()) {
					temp=stack.peek();
					if(!temp.equals("("))
					{
						stack.pop();
						strList.add(temp);
					}else {
						break;
					}
				}
				stack.push(s);
			}
			else {
				strList.add(s);
			}
		}
		while(!stack.isEmpty()) {
			strList.add(stack.pop());
		}
		Stack<BigDecimal>newStack=new Stack<>();
		for(String s:strList)
		{
			if(s.equals("+")||s.equals("-")||s.equals("*")||s.equals("/")) {
				BigDecimal b1=newStack.pop();
				BigDecimal b2=newStack.pop();
				switch(s){
					case "+":
					    newStack.push(b2.add(b1));
					    break;
					case "-":
						newStack.push(b2.subtract(b1));
						break;
					case "*":
						newStack.push(b2.multiply(b1));
						break;
					case "/":
						newStack.push(b2.divide(b1,9,BigDecimal.ROUND_HALF_UP));
						break;
				}
			}
			else {
				newStack.push(new BigDecimal(s));
			}
		}
		return newStack.peek();
    }
}

 

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