线程的实现方式(java)

最新推荐文章于 2025-01-19 22:41:34 发布

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#java #多线程

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本文详细介绍了在Java中创建线程的三种常见方法：继承Thread类、实现Runnable接口及实现Callable接口。通过具体示例代码展示了每种方法的特点及使用场景。

1.继承Thread类来实现

package Thread;

public class ThreadDemo1 extends Thread{
    @Override
    public void run() {
        System.out.println("run:"+Thread.currentThread().getName());
    }

    public static void main(String[] args) throws InterruptedException {
        ThreadDemo1 threadDemo1 = new ThreadDemo1();
        threadDemo1.setName("自定义线程");
        threadDemo1.start();
        sleep(100);
        System.out.println(Thread.currentThread().getName());

    }
}

输出结果：

1.由于main线程在执行，所以先执行完main线程再去执行自定义线程

2.如果main线程sleep了那么结果显然就相反了

2.实现Runnable接口

package Thread;

public class ThreadDemo2 implements Runnable{
    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName());
    }

    public static void main(String[] args) throws InterruptedException {
        Thread thread = new Thread(new ThreadDemo2());
        thread.setName("自定义线程");
        thread.start();
        //Thread.sleep(100);
        System.out.println(Thread.currentThread().getName());
    }
}

与第一种方法相比除了写法不同，原理是一样的，输出结果不再展示

3.实现Callable接口

package Thread;

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;

public class ThreadDemo3 implements Callable {
    @Override
    public Object call() throws Exception {
        System.out.println("输出哈哈哈");
        //这里是返回值
        return "自定义线程";
    }

    public static void main(String[] args) throws ExecutionException, InterruptedException {
        FutureTask futureTask = new FutureTask(new ThreadDemo3());
        Thread thread = new Thread(futureTask);
        thread.start();
       //System.out.println(futureTask.get());
    }

}

注释掉get方法的输出：