一个简单的生产者/消费者例子

import java.util.ArrayList;
import java.util.List;

class Plate {
	private List<Object> apples = new ArrayList<Object>();
	
	public synchronized void putApple(Object apple) {
		if(apples.size() > 0) {
			try {
				wait();
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
		
		apples.add(apple);
		notify();
		System.out.println("放入了一个苹果");
	}
	
	public synchronized void getApple() {
		if(apples.size() == 0) {
			try {
				wait();
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
		
		Object apple = apples.get(0);
		apples.clear();
		notify();
		System.out.println("拿到一个苹果");
	}
}

class Add implements Runnable {

	private Plate applePlate;
	
	private Object apple = new Object();
	
	public Add(Plate applePlate) {
		this.applePlate = applePlate;
	}
	
	@Override
	public void run() {
		for(int i=0; i<5;i++) {
			
			applePlate.putApple(apple);
		}
	}
	
}

class Get implements Runnable {

	private Plate applePlate;
	
	public Get(Plate applePlate) {
		this.applePlate = applePlate;
	}
	
	@Override
	public void run() {
		for(int i=0; i<5;i++) {
			applePlate.getApple();
		}
	}
	
}
public class SynchroTest {

	public static void main(String args[]) {
		
		Plate myPlate = new Plate();
		
		new Thread(new Get(myPlate)).start();
		new Thread(new Add(myPlate)).start();
	}
}