我想让两个数组具有相同的值 [英] I want to have two arrays to have the same values

问题描述

我想在Java中将 array2 设置为 array1 ，如下所示，但这不起作用.

I want to set array2 to array1 in Java alike below but it doesn't work.

int[] array1 = new int[3]{1,2,3};
int[] array2 = new int[3];
array2 = array1;

这有什么问题?

推荐答案

将 array1 的引用分配给 array2 时，会创建一个 shallow 数组的副本；这两个引用指向同一数组.我假设您想要一个 deep 副本，并且可以使用

When you assign the reference of array1 to array2 you create a shallow copy of the array; the two references point to the same array. I assume you wanted a deep copy and you can use Arrays.copyOf(int[], int) to get one. Also, you don't need new[] and an explicit size. That could look something like

int[] array1 = { 1, 2, 3 };
int[] array2 = Arrays.copyOf(array1, array1.length);

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