JAVA.8

1.定义长度位5的整型数组,输入他们的值,用冒泡排序后输出.
package ssa;

import java.util.Scanner;

public class lianxi {
	public static void main(String[] args) {
             int[] a = new int[5];
	        int i, j;
	        int temp;
	        Scanner input = new Scanner(System.in);
	        System.out.println("请输入5个整数:");
	        for (i = 0; i < 5; i++) {
	            a[i] = input.nextInt();
	        }
	        for (i = 0; i < a.length - 1; i++) {
	            for (j = 0; j < a.length - 1 - i; j++) {
	                if (a[j] > a[j + 1]) {
	                    temp = a[j];
	                    a[j] = a[j + 1];
	                    a[j + 1] = temp;
	                }
	            }
	        }
	        System.out.println("排序后:");
	        for (i = 0; i < a.length; i++) {
	            System.out.println(a[i] + "\t");
	        }
	 
	}
	}

　　

2.定义数组{34,22,35,67,45,66,12,33},输入一个数a,查找在数组中是否存在,如果存在,输出下标,不存在输出"not found";
package ssa;

import java.util.Scanner;

public class lianxi {
	public static void main(String[] args) {
        Scanner input=new Scanner(System.in);
        int[] x={34,22,35,67,45,66,12,33};
        System.out.println("请输入一个数:");
        int a=input.nextInt();
        for(int i=0;i<x.length;i++){
            if(x[i]==a){
                System.out.println("该数存在于数组中,下标为"+i);
            }else{
                System.out.println("not found");
            }break;
        }        
	 
	}
	}

　　

3.以矩阵的形式输出一个double型二维数组（长度分别为5、4，值自己设定）的值。
package ssa;

import java.util.Scanner;

public class lianxi {
	public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int[][] a = new int[5][4];
        int m = 0;
        for (int i = 0; i < 5; i++) {
            for (int j = 0; j < 4; j++) {
                a[i][j] = m;
                m++;
            }
        }
        System.out.println("你输入的数组为:");
        for (int i = 0; i < 5; i++) {
            for (int j = 0; j < 4; j++) {
                System.out.print(a[i][j] + "\t");
            }
            System.out.println();
        }
	 
	}
	}

　　

4.定义一个二维数组(长度分别为3,4,值自己设定),求该二维数组的最大值.
package ssa;

import java.util.Scanner;

public class lianxi {
	public static void main(String[] args) {
    	Scanner input = new Scanner(System.in);
        int[][] a = new int[5][4];
        int m = 0;
        int max=0;
        for (int i = 0; i < 3; i++) {
            for (int j = 0; j < 4; j++) {
                a[i][j] = m;
                m++;
            }
        }
        for (int i = 0; i < a.length; i++) {
            for (int j = 0; j < a[i].length-1; j++) {
                if(max<a[i][j]){
                    max=a[i][j];                    
                }
            }
        }
        System.out.println("最大值是:"+max);
	 
	}
	}