java线程之——synchronized的注意细节

package javaBase;

public class JB_052_Synchronized {
	public static void main(String[] args) {
		Resource_052 rs = new Resource_052();
		
		Thread t1 = new Thread(new Thread1_052(rs));  //调用synchronized方法的线程
		Thread t0 = new Thread(new Thread0_052(rs));  //调用普通方法的线程
		Thread t2 = new Thread(new Thread2_052(rs));  //调用另一个synchronized方法的线程
		Thread t3 = new Thread(new Thread3_052(rs));  //调用synchronized static 方法的线程
		Thread t4 = new Thread(new Thread4_052(rs));  //调用static方法的线程
		
		Thread t5 = new Thread(new Thread5_052(rs));  //调用锁class方法的线程
		
		t1.start();  //调用了synchronized方法
		try{
			System.out.println("调用synchronized方法的thread1启动后主程序等待2秒，确保在其它线程执行之前thread1获得对象锁");
			Thread.sleep(2000);
		}catch(InterruptedException e){
			e.printStackTrace();
		}
		t0.start();   //调用了普通方法  //可以 
		t2.start();   //调用了另一个synchronized方法   //不行
		t3.start();   //调用了synchronized static 方法  //可以
		t4.start();  //调用了static方法   //可以
		
		
		//锁class
		try{
			System.out.println("主程序等待10秒，等前面的线程除thread1和被阻塞的线程外都执行完成，后面的代码将做锁class测试....");
			Thread.sleep(10000);
			System.out.println("10秒等待完。");
		}catch(InterruptedException e){
			e.printStackTrace();
		}
		//thread5中会置flag=false终止thread1
		t5.start();
		try{
			System.out.println("主程序等待10秒，确保thread5获得class的对象锁，确保thread1和被阻塞的线程都终止。");
			Thread.sleep(10000);
			System.out.println("10秒等待完。");
		}catch(InterruptedException e){
			e.printStackTrace();
		}
		 
		t0 = new Thread(new Thread0_052(rs));  //普通方法
		t2 = new Thread(new Thread2_052(rs));  //另一个synchronized方法
		t3 = new Thread(new Thread3_052(rs));  //synchronized static 方法
		t4 = new Thread(new Thread4_052(rs));  //static方法
		
		t0.start();   //调用了普通方法  //可以 
		t2.start();   //调用了另一个synchronized方法   //不行
		t3.start();   //调用了synchronized static 方法  //不可以
		t4.start();  //调用了static方法   //可以
	}
}


class Resource_052{
	public boolean flag = true;
	
	public void method0(){
		System.out.println("this is a ordinary method——method0.");
	}
	synchronized public void method1(){
		while(flag){
			System.out.println("this is a synchronized method——method1.");
			try{
				Thread.sleep(2000);
			}catch(InterruptedException e){
				e.printStackTrace();
			}
		}
	}
	synchronized public void method2(){
		System.out.println("this is the second synchronized method——method2.");
	}
	synchronized public static void method3(){
		System.out.println("this is a  synchronized static method——method3.");
	}
	public static void method4(){
		System.out.println("this is a  ordinary static method——method4.");
	}
	
	public void method5(){
		synchronized(Resource_052.class){
			while(true){
				System.out.println("this is a  synchronized static method——method5.");
				try {
					Thread.sleep(2000);
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
			}
			}
	}
	
	synchronized public static void method6(){   //与method5等价
		while(true){
			System.out.println("this is a  synchronized static method——method6.");
			try {
				Thread.sleep(2000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
	}
	
}

class Thread1_052 implements Runnable{
	private Resource_052 rs;
	/**
	 * constructor
	 * @param rs
	 */
	public Thread1_052(Resource_052 rs){
		this.rs = rs;
	}
	@Override
	public void run(){
		this.rs.method1();  //调用synchronized方法
	}
}
class Thread0_052 implements Runnable{
	private Resource_052 rs;
	/**
	 * constructor
	 * @param rs
	 */
	public Thread0_052(Resource_052 rs){
		this.rs = rs;
	}
	@Override
	public void run(){
		this.rs.method0();  //调用普通方法
	}
}
class Thread2_052 implements Runnable{
	private Resource_052 rs;
	/**
	 * constructor
	 * @param rs
	 */
	public Thread2_052(Resource_052 rs){
		this.rs = rs;
	}
	@Override
	public void run(){
		this.rs.method2();  //调用另一个synchronized方法
	}
}
class Thread3_052 implements Runnable{
	private Resource_052 rs;
	/**
	 * constructor
	 * @param rs
	 */
	public Thread3_052(Resource_052 rs){
		this.rs = rs;
	}
	@Override
	public void run(){
		this.rs.method3();  //调用synchronized static方法
	}
}
class Thread4_052 implements Runnable{
	private Resource_052 rs;
	/**
	 * constructor
	 * @param rs
	 */
	public Thread4_052(Resource_052 rs){
		this.rs = rs;
	}
	@Override
	public void run(){
		this.rs.method4();  //调用普通static方法
	}
}
class Thread5_052 implements Runnable{
	private Resource_052 rs;
	/**
	 * constructor
	 * @param rs
	 */
	public Thread5_052(Resource_052 rs){
		this.rs = rs;
	}
	@Override
	public void run(){
		rs.flag=false;
		this.rs.method5();  //调用锁Class的方法
		try {
			Thread.sleep(2000);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}
}