在Java中分配对象ID的优雅方式 [英] Elegant way to assign object id in Java

问题描述

我有一个对象类... lat说苹果。

I have a class for objects ... lat's say apples.

每个苹果对象都有一个唯一的标识符（id）...我该如何确保（优雅高效）新创建的具有唯一ID。

Each apple object mush have a unique identifier (id)... how do I ensure (elegantly and efficiently) that newly created has unique id.

谢谢

推荐答案

在你的Apple类中有一个 static int nextId 并在你的构造函数中增加它。

have a static int nextId in your Apple class and increment it in your constructor.

它可能是谨慎确保您的递增代码是原子的，因此您可以执行类似的操作（使用AtomicInteger）。这将保证如果两个对象完全同时创建，它们不会共享相同的Id。

It would probably be prudent to ensure that your incrementing code is atomic, so you can do something like this (using AtomicInteger). This will guarantee that if two objects are created at exactly the same time, they do not share the same Id.

public class Apple {
    static AtomicInteger nextId = new AtomicInteger();
    private int id;

    public Apple() {
        id = nextId.incrementAndGet();
   }
}

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