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///////////////////////////////// fichier A.java ///////////////////////////////// 
 
class A implements runnable {
 
    int num;
    Thread thread;
 
    public A() {
        Singleton.incrNum();
    }
 
    public synchronized void initNum() {
        num = Singleton.getInstance();
        Singleton.incrNum();
    }
 
    public void run() 
	{
		try {
			isReady();
		}
		catch (InterruptedException e) {
			e.printStackTrace();
		}
		// action a faire.
	}
 
 
    public synchronized void isReady() throws InterruptedException {
	if (num != 1) {
	    wait();
	}
	else {
	    notifyAll();
	}
    }
 
    public static void main(String[] args)  {
		A a = new A();
		a.thread.start();
	}
 
}
 
 
////////////////////////////// fichier Singleton.java ////////////////////////////// 
 
class Singleton {
 
    private static Singleton instance;
    private int num;
    private int[] tab;
 
    private Singleton(){
		tab = new int[2];
		num = 0;
    }
 
    public synchronized static Singleton getInstance() {
	if (instance == null)
		return instance = new Singleton();
	return instance;
    } 
 
 
    public int getNum() {
	return num;
    }
 
 
    public int getTab(int indice) {
	return tab[indice];
    }
 
 
    public void setTab(int indice, int val) {
	tabPorts[indice] = val;
    }
 
    public synchronized void incrNum() {
	num++;
    }
} | 
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