[Summary] Distinguish between assignment and copying of arrays

Distinguish between assignment and copying of arrays

Let's start with the conclusion: Assignment is completely different from copying! !

Summary:
1. Assignment: just give the address of array1 to array2. If you modify array2, array1 will change too!

array2 = array1; //只是把array1的地址给了array2
				 //修改array2的话array1也会变！

2. Copy:

String[] arr = new String[] {
    
    "hyj", "hxc", "hdh", "wt", "wtl", "yhp"};		
//数组的复制(区别于数组变量的赋值：arr1 = arr)
String[] arr1 = new String[arr.length];
for(int i = 0;i < arr1.length;i++){
    
    
	arr1[i] = arr[i];
}