第六次JAVA作业

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 snippet;
import java.util.*;
public class text {
     public static void main(String[] args) {
         Scanner input = new Scanner(System.in);
         int arr[]= {12,31,15,23,38};
         for(int i=0;i<4;i++){
           for(int a=0;a<4-i;a++){
                 if(arr[a]>arr[a+1]){
                 int j=arr[a];
                 arr[a]=arr[a+1];
                 arr[a+1]=j; 
                 }
         }
          
     }
         for(int i=0;i<5;i++){
             System.out.println(arr[i]);
         }
     }
 
     }
        

 

 

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 snippet;
import java.util.*;
public class text {
     public static void main(String[] args) {
         Scanner sc=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=sc.nextInt();
            for(int i=0;i<x.length;i++){
                if(x[i]==a){
                    System.out.println("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 snippet;
import java.util.*;
public class text {
     public static void main(String[] args) {
         Scanner sc = new Scanner(System.in);
            int[][] a = new int[5][4];
            for (int i = 0; i < 5; i++) {
                for (int j = 0; j < 4; j++) {
                    a[i][j] = sc.nextInt();
                }
            }
            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]);
                }
                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 snippet;
import java.util.*;
public class text {
	 public static void main(String[] args) {
		 Scanner sc = new Scanner(System.in);
		 
	        int[][] a = new int[5][4];
	        int max=0;
	        for (int i = 0; i < 3; i++) {
	            for (int j = 0; j < 4; j++) {
	                a[i][j] = sc.nextInt();
	            }
	        }
	        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);
	    }
	    }