JAVA线程的三种简单实现

JAVA并发编程的书有很多，对我胃口的就这一本：《Java并发编程从入门到精通》。

不厚，但从入门讲起。

今天实践了三种线程的简单实现。

ThreadA

package demo.thread;

public class ThreadA extends Thread {
	public void run() {
		super.run();
		try {
			Thread.sleep(500L);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		System.out.println("This is thread A.");
	}

}

ThreadB

package demo.thread;

public class ThreadB implements Runnable {
	public void run() {
		try {
			Thread.sleep(600L);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		System.out.println("This is thread B.");
	}

}

ThreadC

package demo.thread;

import java.util.concurrent.Callable;

public class ThreadC implements Callable<String> {
	public String call() throws Exception {
		try {
			Thread.sleep(500L);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		System.out.println("This is thread C.");
		return "thread C";
	}

}

ThreadMain

package demo.thread;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;

public class ThreadMain {
	public static void main(String[] args) {
		ThreadA threadA = new ThreadA();
		threadA.start();

		ThreadB threadB = new ThreadB();
		new Thread(threadB).start();

		ThreadC threadC = new ThreadC();
		FutureTask<String> future = new FutureTask<String>(threadC);
		new Thread(future).start();

		System.out.println("This is main thread.");
		System.out.println("This is main thread begin.");

		try {
			System.out.println("threadC return value: " + future.get());
		} catch (InterruptedException e) {
			e.printStackTrace();
		} catch (ExecutionException e) {
			e.printStackTrace();
		}

		System.out.println("This is main thread end.");
	}

}

输出样子