Java多线程——之一创建线程的四种方法 - sun-sailing

来源：cnblogs　　作者：sun-sailing　　时间：2018/10/16 9:40:31　　对本文有异议

1.实现Runnable接口，重载run()

public class ThreadRunnable implements Runnable {
    public void run() {
        for (int i = 0; i < 10; i++) {
            System.out.println(Thread.currentThread() + ":" + i);
        }
    }
}
 
public class ThreadMain {
    public static void main(String[] args)
    {
        ThreadRunnable threadRunnable = new ThreadRunnable();
        threadRunnable.run();
    }
}

2.继承Thread类，复写run()

使用时通过调用Thread的start()（该方法是native），再执行创建线程的run()

不足：由于java为单继承，若使用线程类已经有个父类，则不能使用该方式创建线程。

public class ThreadEx extends Thread {
    public void run() {
        for (int i = 0; i < 10; i++) {
            System.out.println(Thread.currentThread() + ":" + i);
        }
    }
}
 
 
public class ThreadMain {
    public static void main(String[] args)
    {
        ThreadEx threadEx = new ThreadEx();
        threadEx.start();
    }
}

3.实现Callable接口，有返回值

补充：与实现Runnable接口类似，都是实现接口，不同的是该方式有返回值。

import java.util.concurrent.Callable;
 
public class ThreadCallable implements Callable {
    public Object call() throws Exception {
        for (int i = 0; i < 10; i++) {
            System.out.println(Thread.currentThread() + ":" + i);
        }
        return "succeed";
    }
}
 
 
public class ThreadMain {
    public static void main(String[] args) throws Exception
    {
        ThreadCallable threadCallable = new ThreadCallable();
        System.out.println(threadCallable.call());
    }
}