线程初学

class MyThread implements Runnable{
	int i = 100;
	public void run(){
		while(true){
			synchronized(this){
			//Thread.currentThread()获取当前代码在哪个线程中运行，会返回线程对象（Thread对象）
			System.out.println(Thread.currentThread().getName() + i);
			i--;
			//让线程让出CPU，使所有线程重新竞争CPU
			Thread.yield();
			if(i<0)
				break;
			}
		}
	}
}

class Test{
	public static void main(String[] args){
		MyThread mythread = new MyThread();
		
		//生成两个Thread对象，但是这两个Thread对象共用同一个线程体
		Thread t1 = new Thread(mythread);
		Thread t2 = new Thread(mythread);
		
		//每一个名字都有名字，可以通过Thread对象的setName()方法设置线程名字
		t1.setName("线程a");
		t2.setName("线程b");
		
		//分别启动两个线程
		t1.start();
		t2.start();
	}
}

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synchronized用法同步锁（锁代码块）

class Service{
	public void fun1(){
		synchronized(this){
			try{
				Thread.sleep(3 * 1000);
			}
			catch(Exception e){
				System.out.println(e);
			}
			System.out.println("fun1");
		}
	}
	
	public void fun2(){
		synchronized(this){
			System.out.println("fun2");
		}
	}
}

class MyThread1 implements Runnable{
	private Service service;
	
	public MyThread1(Service service){
		this.service = service;
	}
	
	public void run(){
		service.fun1();
	}
}

class MyThread1 implements Runnable{
	private Service service;
	
	public MyThread1(Service service){
		this.service = service;
	}
	
	public void run(){
		service.fun2();
	}
}

class Test{
	public static void main(String[] args){
		Service service = new Service();
		Thread t1 = new Thread(new MyThread1(service));
		Thread t2 = new Thread(new MyThread2(service));
		
		t1.start();
		t2.start();
	}
}

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synchronized用法同步锁（锁方法）