在Java中从另一个类访问变量的实例 [英] Accessing an instance of a variable from another class in Java

问题描述

可以从Java中的另一个类访问一个类中的变量的实例。

Is it possible to access an instance of a variable in one class from another class in Java.

假设您在A类中有以下类型：

Let's say you have the following in Class A:

private BlockingQueue<byte[]> buffer = new LinkedBlockingQueue<byte[]>();

我想对此类中的队列进行更改，然后可以使用另一个类。

I want to make changes to the queue in this class and then be able to use to access it from another class.

如何从另一个类访问缓冲区的实例？是否可能？

How would i access the instance of buffer from another class? Is it even possible?

推荐答案

添加getter：

public class Whatever {

    private BlockingQueue<byte[]> buffer = new LinkedBlockingQueue<byte[]>();

    public BlockingQueue<byte[]> getBuffer() {
        return buffer;
    }
}

然后如果你有一个Whatever的实例：

Then if you have an instance of Whatever:

Whatever w = new Whatever();
BlockingQueue<byte[]> buffer = w.getBuffer();

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