反转数组

 

新数组 arr2[i]=arr1[arr1.length-1-i]  要减去1 否则超出范围

import java.util.Scanner;
public class For02{
    public static void main(String[] args){
    
    //Scanner myScanner = new Scanner(System.in);
    System.out.println("反转数组");
    
    //int num = myScanner.nextInt();
    //int [] arr = {4,-1,9,10,23};
    
    
    int [] arr1 ={1,2,3};
    //新开辟一个空间
    int [] arr2= new int[arr1.length];
    
    for(int i=0;i<arr1.length;i++){
        arr2[i]=arr1[arr1.length-1-i];//将arr1里的值赋值给arr2
    }
    
    for(int i=0;i<arr1.length;i++){
        System.out.println(arr2[i]);
    }

    
}//结束主方法                                          
}//结束程序