数组分配到新的变量，改变原有的变化新

问题描述

int[] test = {0,1,2,3,4,5};
    int[] before = test;
    System.out.println(before[2]);
    test[2] = 65;
    System.out.println(before[2]);

第一的System.out打印 2 ，它应该，但第二次打印的 65 。我一直在这门语言了一年多的编程并据我知道这不是假设发生！任何帮助吗？

The first System.out prints 2 and it should, but the second prints 65. I have been programming for over a year in this language and as far as I know this is NOT suppose to happen! Any help?

    int first = 9;
    int second = first;
    System.out.println(second);
    first = 10;
    System.out.println(second);

在code以上版画 9 两条线路上。

推荐答案

当你做之前=测试; ，之前仅仅是参考测试阵列，否新阵列已创建并分配给测试。所以，当你前的值[I] 你基本上看测试[I] 和副价​​值反之亦然。 之前就是测试的别名。这就是为什么在第二次印刷你得到65

When you do before = test;, before is just a reference to test array, NO new array has been created and assigned to test. So when you look the value of before[i] you basically look at the value of test[i] and vice versa. before is just an alias of test. That's why in the second print you get 65.

从在Java中文本 STRONG>的书，它一定会帮助你。

Check this text from Thinking in Java book, it will definitely help you.

这篇关于数组分配到新的变量，改变原有的变化新的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！