线程的创建：
Thread()
Thread(String name)
Thread(Runnable target)
Thread(Runnable target, String name)

线程的方法:
//启动线程
void start()
//线程休眠
static void sleep(long millis)
static void sleep(long millis, int nanos)
//使其他线程等待至当前线程终止
void join();
void join(long millis);
void join(long millis, int nanos);
//当前线程释放资源
static void yield()
//获取当前运行的线程引用
static Thread currentThread()

Thread And Runnable 的简单实现

public class Actress implements Runnable{
    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName() +" I am an actress");
        int count = 0;
        boolean keepRunning = true;
        while(keepRunning) {
            System.out.println(Thread.currentThread().getName()+ " appear "+count++);
            System.out.println(Thread.currentThread().getName()+" finish acting");
            if(count == 100) {
                keepRunning = false;
            }
            try {
                Thread.sleep(200);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

}

public class Actor extends Thread {
    public void run() {
        System.out.println(getName() +" I am an actor");
        int count = 0;
        boolean keepRunning = true;
        while(keepRunning) {
            System.out.println(getName()+ " appear "+count++);
            System.out.println(getName()+" finish acting");
            if(count == 100) {
                keepRunning = false;
            }
            try {
                Thread.sleep(200);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    public static void main(String[] args) {
        Thread act = new Actor();
        act.setName("Mr Thread");
        act.start();
        Thread actress = new Thread(new Actress(), "MS.Runnable");
        actress.start();
    }
}