【Java基础】数组的赋值和复制

1.数组赋值

arr2 = arr1;

        int[] arr1,arr2;
        arr1 = new int[]{2,3,5,7,11,13,17,19};
        arr2 = arr1;
        for (int i = 0; i < arr2.length; i++) {
            if (i%2==0){
                arr2[i] = i;
            }
        }

图示，arr1开辟连续空间，arr2 = arr1赋值操作将arr1的地址赋给arr2，两个变量共同指向一个地址，修改操作会引起改变

2.数组复制

        int[] arr1,arr2;
        arr1 = new int[]{2,3,5,7,11,13,17,19};
        arr2 = new int[arr1.length];
 
        for (int i = 0; i < arr1.length; i++) {
            arr2[i] = arr1[i];
        }

两次new操作，开辟两块连续空间