1 Java中有几种方式创建线程

1 Java中有几种方式创建线程

四种

一 继承 thread 类

public class ZhouyuThread extends Thread{
    public static void main(String[] args){
        ZhouyuThread thread = new ZhouyuThread();
        thread.start();
    }

    @Override
    public void run(){
        System.out.println("hello zhouyu");
    }
}

重写run方法而不是start方法 缺点单继

 

二 实现 runnable 接口

public class ZhouyuThread implements Runnable{
    public static void main(String[] args){
        Thread thread = new Thread (new ZhouyuThread());
        thread.start();
    }

    public void run(){
        System.out.println("hello zhouyu");
    }
}

 

 匿名内部类

public class ZhouyuThread {
    public static void main(String[] args){
        Thread thread = new Thread (new Runable(){
            public void run(){
                System.out.println("hello zhouyu");
            }
        });
        thread.start();
    }

}                

 

 runnable是函数式接口 只有一个润方法 可以利用lambda 表达式 这是java8 的行动性

public class ZhouyuThread{
    public static void main(String[] args){
        Thread thread = new Thread(() -> System.out.print("hello zhouyv"));
        thread.start();
}    

总而言之 实现runnable接口

 

三 实现 callable 接口

区别 Runnable 这个可以拿到结果

public class ZhouyuThread implements Callable<String> {
    public static void main(String[] args)throws ExecutionException,InterruptedException{
　　 　　//FutureTask 接口继承了 Runable 和 Future
        FutureTask<String> futureTask =new FutureTask<>(new ZhouyuThread());
        Thread thread = new Thread (futureTask);
        thread.start();
　　　　 //阻塞式拿到结果 没结果当前线程会被挂起
        String result =  futureTask.get();
        System.out.println(result);
    }

    @Override
    public String call(){
        return "hello zhouyu";
    }
}

四 利用线程池创建线程

public class ZhouyuThread implements Runnable {
    public static void main(String[] args)throws ExecutionException,InterruptedException{
        ExecutorService executorService = Executors.newFixedThreadPool(10);
        executorService .execute(new ZhouyuThread());
    }

    @Override
    public void run(){
        System.out.println("hello zhouyu");
    }
}