J2SE学习笔记（7）多线程

多线程在Java中，一个应用程序可以包含多个线程。每个线程执行特定的任务，并可与其他线程并发执行。多线程使系统的空转时间最少，提高CPU利用率。多线程编程环境用方便的模型隐藏CPU在任务间切换的事实。

public class FirstThread implements Runnable ...{
    public static void main(String[] args) ...{
        //创建线程对象
        Thread first=new Thread(new FirstThread());
        System.out.println(first.isAlive());//线程是否激活
        first.start();//启动线程
        System.out.println(first.isAlive());//线程是否激活
        Thread.sleep(1000*5);    //休眠5秒

            //计时器    }

    public void run() ...{
        System.out.println("thread running...");
    }
}

           Timer timer=new Timer(true);
            timer.schedule(new FirstThread (),1000*5,1000*10);

public class PropertyThread extends Thread ...{
    private int property;
    private String name;
    public PropertyThread(String name,int property)...{
        this.property = property;
        this.name = name;
        
        this.setPriority(property);
        this.setName(name);
        this.start();
        
    }
    public void run() ...{
        
        for (int i = 0; i < 3; i++) ...{
            
            System.out.println(this.name+":"+this.property);
            try ...{
                Thread.sleep(1);
            } catch (InterruptedException e) ...{
                e.printStackTrace();
            }
        }
        
    }
}
public class PropertyTest ...{

    public static void main(String[] args) ...{
                                           //访问级别
        PropertyThread p1=new PropertyThread("p1",Thread.NORM_PRIORITY);
        PropertyThread p2=new PropertyThread("p2",Thread.MAX_PRIORITY);
        PropertyThread p3=new PropertyThread("p3",Thread.MIN_PRIORITY);
    }

}