如何在Java中将可执行块作为参数传递？ [英] How do you pass an executable block as a parameter in Java?

问题描述

有没有办法将可执行块作为参数传递给静态方法？有可能吗？例如，我有这个方法

Is there a way to pass an executable block as a parameter to a static method? Is it possible at all? For example I have this method

public static void someMethod(boolean flag, Block block1, BLock block2) {
    //some other code
    if(flag)
        block1.execute();
    else block2.execute();
    //some other code
}

或类似的东西。它实际上比这更复杂，我只是简化了问题。我正在尝试重构我的项目，我创建了一个包含我的类使用的静态方法的通用实用程序类。

or something like that. It's actually more complicated than this, I just simplified the question. I am trying to refactor my project and I created a generic utility class that contains static methods that my classes use.

推荐答案

你可以使用 Runnable 对象：

public static void someMethod(boolean flag, Runnable block1, Runnable block2) {
    //some other code
    if(flag)
        block1.run();
    else block2.run();
    //some other code
}

然后你可以用以下方式调用它：

Then you can call it with:

Runnable r1 = new Runnable() {
    @Override
    public void run() {
        . . .
    }
};
Runnable r2 = . . .
someMethod(flag, r1, r2);

编辑（抱歉，@ Bohemian）：在Java 8中，可以使用lambdas简化调用代码：

EDIT (sorry, @Bohemian): in Java 8, the calling code can be simplified using lambdas:

someMethod(flag, () -> { /* block 1 */ }, () -> { /* block 2 */ });

您仍然声明 someMethod 相同办法。 lambda语法只是简化了如何创建和传递 Runnable s。

You'd still declare someMethod the same way. The lambda syntax just simplifies how to create and pass the Runnables.

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