多线程（一）——三种实现方式

java中实现多线程的三种方式

继承Thread类

public class ExtendsThreadWay extends Thread{
    @Override
    public void run() {//重写 run 方法
        for (int i = 0; i < 10; i++) {
            System.out.println("------多线程-------" + i);
        }
    }
    public static void main(String[] args) {
        ExtendsThreadWay et = new ExtendsThreadWay();
        et.start();
        for (int i = 0; i < 10; i++) {
            System.out.println("主线程" + i);
        }
    }
}

实现Runable接口

public class AchieveRunnableWay implements Runnable{
    @Override
    public void run() {//实现接口
        for (int i = 0; i < 10; i++) {
            System.out.println("------多线程-------" + i);
        }
    }
    public static void main(String[] args) {
        Thread t = new Thread(new AchieveRunnableWay());
        t.start();
        for (int i = 0; i < 10; i++) {
            System.out.println("主线程" + i);
        }
    }

}

实现callable接口和future对象

public class AchieveCallableWay implements Callable<String> {
    @Override
    public String call() throws Exception {
        for (int i = 0; i < 10; i++) {
            System.out.println("------多线程-------" + i);
        }
        return null;
    }
    public static void main(String[] args) throws InterruptedException, ExecutionException {
        //其实就三步：1 创建Callable实例    
        //2将Callable实例设置进FutureTask实例中   
        //3将FutureTask实例作为Runnable类型设置进Thread中  
        AchieveCallableWay task = new AchieveCallableWay();
        FutureTask f = new FutureTask(task);
        new Thread(f).start();
        for (int i = 0; i < 10; i++) {
            System.out.println("主线程" + i);
        }
    }
}