本文关键词：Java 8， 函数式接口，lambda 。
介绍
全路径: java.lang.Runnable
该接口在 Java 8 之前就存在，从 Java 8 开始加了注解 @FunctionalInterface。一般用于多线程开发中。
源码：
@FunctionalInterface
public interface Runnable {
/**
* When an object implementing interface <code>Runnable</code> is used
* to create a thread, starting the thread causes the object's
* <code>run</code> method to be called in that separately executing
* thread.
* <p>
* The general contract of the method <code>run</code> is that it may
* take any action whatsoever.
*
* @see java.lang.Thread#run()
*/
public abstract void run();
}
示例
代码示例：
public class Main {
public static void main(String[] args) {
Runnable runnable = () -> {
System.out.println("你好");
};
runnable.run(); // 输出: 你好
}
}