Lambda表达式

Lambda表达式的形式

(parameters) -> { statements; }

parameters：参数列表，类似于方法参数。
->：箭头符号，用于分隔参数列表和Lambda表达式的主体。
{ statements; }：Lambda表达式的主体部分，类似方法体。

使用场景：
函数式接口可以使用Lambda表达式来创建接口实例。函数式接口是指只包含一个抽象方法的接口。如Runnable。

@FunctionalInterface
public interface Runnable {
    /**
     * When an object implementing interface {@code Runnable} is used
     * to create a thread, starting the thread causes the object's
     * {@code run} method to be called in that separately executing
     * thread.
     * <p>
     * The general contract of the method {@code run} is that it may
     * take any action whatsoever.
     *
     * @see     java.lang.Thread#run()
     */
    public abstract void run();
}

提交一个Runnable实例到线程池。

		ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(
                3,
                3,
                3,
                TimeUnit.MINUTES,
                new ArrayBlockingQueue<>(3)
        );

        threadPoolExecutor.submit(()->{
            System.out.println("1111111111");
        });