多线程创建的三种方式

多线程的实现三种方式:
1 继承thread类,重写run方法
继承thread方法就可以i调用thread类的start方法,,start方法调用java natvie start0();
这个是调用操作系统的方法,start方法

class Mythread01 extends  Thread{
    @Override
    public void run(){
        System.out.println("iii");
    }}
public class Mythread {
    public static void main(String[] args) {
        Mythread01 my = new Mythread01();
        my.start();
    }


}

2 实现runnable接口
接口实现是没有start方法,但是多线程必须采用start方法,所以需要调用new thread(mythread)
再调用start方法.

class MyThread implements  Runnable{
    private Integer ticket=10;
    @Override
    public void  run() {
        synchronized (this) {
            for (int i = 0; i < 10; i++) {
                System.out.println("zhgee" + i);
                System.out.println(ticket);
                ticket--;
                if (ticket<0){
                    break;
                }
            }
        }
    }
}
public class RunnableDemo {
    public static void main(String[] args) {
        MyThread myThread=new MyThread();
        new Thread(myThread).start();
        new Thread(myThread).start();
    }
}

thread类是runnable的接口子类,可以有效避免单继承的局限性
runnable接口可以很好的体现数据共享概念
如果继承thread类,那么就可以继承sart方法,runnable接口中,需要构建thread对象调用thread的start方法

3 实现callable接口

class CallableThread implements Callable<String> {
    private Integer ticket = 10;

    @Override
    public String call() throws Exception {
        synchronized (this) {
            for (int i = 0; i < 10; i++) {
                System.out.println("zhgee" + i);
                System.out.println(ticket);
                ticket--;
                if (ticket < 0) {
                    break;
                }
            }
            return "票卖完了";
        }

    }
}
public class CallableDemo {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        CallableThread callableThread=new CallableThread();
        CallableThread callableThread1=new CallableThread();
        FutureTask<String> futureTask=new FutureTask(callableThread);
        FutureTask<String> futureTask1=new FutureTask(callableThread1);
        new Thread(futureTask).start();
        new Thread(futureTask1).start();
        System.out.println(futureTask.get());
        System.out.println(futureTask1.get());

    }

}