马士兵J2SE-第九章-多线程机制-举例、线程同步之锁

 

package com.zzk.test;

//同样一个线程类可以起两个线程
public class Test {
	public static void main(String[] args) {
		Runner r=new Runner();
		Thread t1=new Thread(r);
		Thread t2=new Thread(r);
		t1.start();
		t2.start();
	}
}


class Runner implements Runnable {
	public void run() {
		for(int i=0;i<30;i++) {
			System.out.println("No. "+i);
		}
	}
}

 

 

package com.zzk.test;

//sleep方法
public class Test {
	public static void main(String[] args) {
		Runner r=new Runner();
		Thread t=new Thread(r);
		t.start();
	}
}


class Runner implements Runnable {
	public void run() {
		for(int i=0;i<30;i++) {
			if(i%10==0 && i!=0) {
				try {
					Thread.sleep(2000);
				}catch(InterruptedException e) {}
			}
			
			System.out.println("No. "+i);
		}
	}
}

package com.zzk.test;

//正确停止一个线程
public class Test {
	public static void main(String[] args) {
		Runner r=new Runner();
		Thread t=new Thread(r);
		t.start();
		
		for(int i=0;i<100000;i++) {
			if(i%10000==0&i>0)
				System.out.println("in thread main i="+i);
		}
		System.out.println("Thread main is over");
		r.shutDown();
		
	}
}


class Runner implements Runnable {
	private boolean flag=true;
	
	public void run() {
		int i=0;
		while (flag==true) {
			System.out.print(" "+i++);
		}
	}
	
	public void shutDown() {
		flag=false;
	}
}

package com.zzk.test;

public class Test {
	public static void main(String[] args) {
		Runner r=new Runner();
		Thread t=new Thread(r);
		t.start();
		
		try {
			t.join();
		}catch(InterruptedException e) {
			
		}
		
		for(int i=0;i<50;i++) {
			System.out.println("主线程："+i);
		}
	}
}

class Runner implements Runnable {
	public void run() {
		for(int i=0;i<50;i++) {
			System.out.println("SubThread: "+i);
		}
	}
}

 

package com.zzk.test;

public class Test {
	public static void main(String[] args) {
		Thread t=new Runner();
		t.start();
		
		for(int i=0;i<50;i++) {
			System.out.println("MainThread: "+i);
		}
	}
}

class Runner extends Thread {
	public void run() {
		System.out.println(Thread.currentThread().isAlive());
		for(int i=0;i<50;i++) {
			System.out.println("SubThread: "+i);
		}
	}
}

 

package com.zzk.test;

public class Test implements Runnable {
	Timer timer=new Timer();
	public static void main(String[] args) {
		Test test=new  Test();
		Thread t1=new Thread(test); 
		Thread t2=new Thread(test);
		t1.setName("t1");
		t2.setName("t2");
		t1.start();
		t2.start();
	}
	
	public void run() {
		timer.add(Thread.currentThread().getName());
	}
	
}

//class Timer {
//	private static int num=0;
//	
//	public void add(String name) {
//		synchronized(this) {//锁定某一个东西
//			num++;
//			try {Thread.sleep(1);}
//			catch(InterruptedException e) {}
//			System.out.println(name+",你是第"+num+"个使用timer的线程");
//		}
//	}
//}


class Timer {
	private static int num=0;
	
	public synchronized void add(String name) {//锁定当前对象
		
			num++;
			try {Thread.sleep(1);}
			catch(InterruptedException e) {}
			System.out.println(name+",你是第"+num+"个使用timer的线程");
		
	}
}

输出：

t1,你是第1个使用timer的线程
t2,你是第2个使用timer的线程