复制一个数组

1.开辟一个新的空间

2.将旧数组内的数值赋值到新数组中

import java.util.Scanner;
public class For02{
    public static void main(String[] args){
    
    //Scanner myScanner = new Scanner(System.in);
    System.out.println("复制数组");
    
    //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];
    arr2 [0]=3;
    for(int i=0;i<arr1.length;i++){
        arr2[i]=arr1[i];//将arr1里的值赋值给arr2
    }
    
        

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