我们可以在java中调整数组的大小吗？ [英] can we resize an array in java?

问题描述

我们可以在java中调整数组大小吗？如果没有，请解释一下：

can we resize an array in java? if not, explain this:

    int arr[] = new int[1];
    arr[0]=-10;
    //arr[1]=1;
    arr=new int[2];  //Explain this
    arr[0]=-1;
    arr[1]=1;
    System.out.println(arr[0]+" "+arr[1]);

推荐答案

就我而言，调整阵列大小是不可能的关注。

Resizing an array is impossible, as far as I'm concerned.

要理解代码的工作原理，您需要了解数组是引用类型。 arr 包含对实际数组的引用，如下所示：

To understand why your code works, you need to understand that arrays are reference types. arr holds an reference to the actual array, like this:

      holds                points to
arr ----------> reference -----------> array object

在这一行：

arr=new int[2];

你最后没有对数组对象做任何事情。你基本上是在说：

You are not doing anything to the array object at the very end there. You're basically saying:

嘿 arr 。我不希望你再持有那个引用。放开并按住此引用（这是一个长度为2的数组）！

Hey arr. I don't want you to hold that reference anymore. Let go and hold this reference (which is an array with length 2)!

会发生什么那个长度为1的原始数组对象呢？您询问。这就是GC到位的地方。在某些时候，会收集没有引用指向的对象。

"What happens to the original array object with length 1 then?" you asked. This is where the GC comes into place. At some point, objects that has no reference pointing to, are collected.

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