doprotected.java

java手机程序开发随书光盘源代码

import javax.microedition.midlet.*;

public class DoProtected extends MIDlet{

	int data = 0;
	SetThread setThread;
	GetThread getThread;
	Monitor monitor;
	boolean settable = false;

	public DoProtected(){
		setThread = new SetThread();
		getThread = new GetThread();
		monitor = new Monitor();
	}	

	public void startApp(){
		getThread.start();
		setThread.start();
	}

	public void pauseApp(){
	}

	public void destroyApp(boolean unconditional){
	}
	
	class SetThread extends Thread{
	
		public void run(){
			while(data != 10){
				monitor.set();
			}
			System.out.println("SetThread Exit!");
		}	
	}
	class GetThread extends Thread{
	
		public void run(){
			while(data != 10){
				for(int i=0;i<1000;i++){}
				monitor.get();
			}
			System.out.println("GetThread Exit!");
		}	
	}
	
	class Monitor{
	
		public synchronized void set(){
			while(!settable){	
				try{
					wait();
				}
				catch(Exception ex){}
			}
			data++;
			System.out.println("Set data = "+data);	
			settable = false;
			notify();		
		}
		
		public synchronized void get(){
			while(settable){		
				try{
					wait();
				}
				catch(Exception ex){}
			}
			System.out.println("Get data = "+data);
			settable = true;
			notify();
		}
	}
}