Java创建线程的方式

创建线程的方法

1. 直接使用Thread

public class Test1 {

    public static void main(String[] args) {

        // 1.创建线程
        Thread t = new Thread() {
            // 2. 线程要执行的任务
            @Override
            public void run() {
                System.out.println(Thread.currentThread().getName() + " running...");
            }
        };

        t.start();

        System.out.println(Thread.currentThread().getName() + " running...");
    }

}

2. 使用Runnable配合Thread

线程和任务分离开来

public class Test2 {

    public static void main(String[] args) {

        // 线程要执行的任务
        Runnable runnable = new Runnable() {
            @Override
            public void run() {
                System.out.println(Thread.currentThread().getName() + " running...");
            }
        };

        // 2. 创建线程
        new Thread(runnable).start();

        System.out.println(Thread.currentThread().getName() + " running...");
    }

}

Runnable的创建也可以使用lambda表达式来处理：

@Test
public void test2() {
    Runnable runnable = () -> {
        System.out.println(Thread.currentThread().getName() + " running...");
    };
}

3. 使用FutureTask、Callable、Thread组合获取线程返回值

public class Test3 {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        FutureTask<Integer> futureTask = new FutureTask<>(new Callable<Integer>() {
            @Override
            public Integer call() throws Exception {
                Thread.sleep(1000);
                return 100;
            }
        });

        Thread t = new Thread(futureTask, "futureTask thread");
        t.start();

        System.out.println(futureTask.get());
    }
}