Java 8 lambdas和匿名内部类之间的性能差异

问题描述

在Java 8之前，lambda功能可以通过使用匿名内部类来实现。例如：

Before Java 8, lambda functionality could be achieved by using anonymous inner classes. For example:

interface Lambda {
    void doStuff();
}

// ...

public void doWithCallback(Lambda callback) {
    // ...
    callback.doStuff();
}

// ...

doWithCallback(new Lambda { 
    public void doStuff() { 
        // ... 
    } 
});

在性能方面，仍然使用这种方法和使用新的Java 8 lambdas ？

In terms of performance, is there a difference between still using this approach and using the new Java 8 lambdas?

推荐答案

Oracle发布了一项比较Lambdas和匿名类之间性能的研究

Oracle has posted a study comparing performance between Lambdas and anonymous classes

请参阅Sergey Kuksenko的，这是74个幻灯片长度。

See JDK 8: Lambda Performance Study by Sergey Kuksenko, which is 74 slides long.

摘要：加热缓慢，但当JIT内嵌时，最坏的情况与匿名类一样快，但可以更快。

Summary: slow to warm up but when JIT inlines it worst case just as fast as anonymous class but can be faster.

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