3种启动线程的方式

1.继承 thread 类
继承 thread 类,并重写 run 方法

public void MyThread extends Thread{
    private int i;    
    @Override
    public void run(){
        for (; i < 10;i++)
        {
            System.out.println(getName() + "\t" + i);
        }
    }
}

测试：

public class MyTest{
    public static void main(String[] args){
        for (int i = 0;i < 10;i++){
            System.out.println(Thread.currentThread.getName() + "\t" + i);
            if (i == 5){
                MyThread t1 = new MyThread();
                MyThread t2 = new MyThread();
                t1.start();
                t2.strat();
            }
        }
    }
}

2.实现 Runnable 接口

    public class MyRunThread implements Runnable{
        private int i;
        public void run(){
            for (;i < 20; i++){
                System.out.println(Thread.currentThread().getName()+" "+i);
                if(i==20)
                {
                    System.out.println(Thread.currentThread().getName()+"执行完毕");
                }
            }
        }
    }

测试：

public class MyTest{
    public static void main(String[] args){
        for (int i = 0;i < 10;i++){
            System.out.println(Thread.currentThread.getName() + "\t" + i);
            if (i == 5){
                MyRunThread myThread = new MyThread();
                Thread t1 = new Thread(myThread,"1");
                Thread t2 = new Thread(myThread,"2");
                t1.start();
                t2.strat();
            }
        }
    }
}

3.实现 Callable 接口

public class MyCallThread implements Callable<Integer>{
    private int i;
    public Integer call() throw Exception{
        for (;i < 20;i++){
            System.out.println(Thread.currentThread().getName()+""+i);
        }
        return i;
    }
}

测试：

public class MyTest{
    public static void main(String[] args){
        MyCallThread t1 = new MyCallThread();
        FutureTask<Integer> f = new FutureTask<>(t1);
        Thread t2 = new Thread(f,"新线程")；
        t2.start();
        try{
            System.out.println(f.get());
        }catch(Exception e) {
            // TODO: handle exception
        }
    }
}