交换原语的Java方法 [英] Java method to swap primitives

问题描述

如果没有可以通过引用传递的方法，我该如何在Java中使我的交换函数生效?有人可以给我一个密码吗?

how do I make my swap function in java if there is no method by which we can pass by reference? Could somebody give me a code?

swap(int a, int b)
{
     int temp = a;
     a = b;
     b = temp;
}

但是，由于Java通过值传递参数，因此更改不会反映出来.

But the changes wont be reflected back since java passes parameters by value.

推荐答案

您无法创建方法交换，因此调用swap(x,y)后将交换x和y的值.您可以通过交换它们的内容来为可变类创建此类方法¹，但这不会更改其对象标识，因此您无法为此定义通用方法.

You can't create a method swap, so that after calling swap(x,y) the values of x and y will be swapped. You could create such a method for mutable classes by swapping their contents¹, but this would not change their object identity and you could not define a general method for this.

但是，您可以编写一种方法来交换数组或列表中的两个项目(如果需要的话).

You can however write a method that swaps two items in an array or list if that's what you want.

¹例如，您可以创建一个包含两个列表的交换方法，执行该方法后，列表x将具有列表y的先前内容，列表y将具有列表x的先前内容.

¹ For example you could create a swap method that takes two lists and after executing the method, list x will have the previous contents of list y and list y will have the previous contents of list x.

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