#Thread4.java

/*
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package java2.lesson05;

import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author Diep.Tran
 */
public class Thread4 extends Thread {

    @Override
    public void run() {
        SharedData sharedData = SharedData.getInstance();

        synchronized (sharedData) {
            for (int i = 0; i < 10; i++) {
                sharedData.notifyAll();
                try {
                    sharedData.wait();
                } catch (InterruptedException ex) {
                    Logger.getLogger(Thread4.class.getName()).log(Level.SEVERE, null, ex);
                }

                int rand = SharedData.getInstance().getRand();
                System.out.println("T4 > " + (rand * rand));
            }
        }

        System.out.println("T4 stop");
        synchronized (sharedData) {
            sharedData.notifyAll();
        }
    }

}

#Thread3.java

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package java2.lesson05;

import java.util.Random;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author Diep.Tran
 */
public class Thread3 extends Thread {

    @Override
    public void run() {
        try {
            Thread.sleep(50);
        } catch (InterruptedException ex) {
            Logger.getLogger(Thread3.class.getName()).log(Level.SEVERE, null, ex);
        }

        SharedData sharedData = SharedData.getInstance();
        Random random = new Random();

        synchronized (SharedData.getInstance()) {
            for (int i = 0; i < 10; i++) {
                int rand = random.nextInt(10);
                System.out.println("T3 > " + rand);
                SharedData.getInstance().setRand(rand);

                sharedData.notifyAll();
                try {
                    sharedData.wait();
                } catch (InterruptedException ex) {
                    Logger.getLogger(Thread3.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }

        System.out.println("T3 stop");
        synchronized (sharedData) {
            sharedData.notifyAll();
        }
    }

}

#Thread2.java

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package java2.lesson05;

/**
 *
 * @author Diep.Tran
 */
public class Thread2 extends Thread{

    @Override
    public void run() {
        for (int i = 0; i < 10; i++) {
            SharedData.getInstance().changeX(-i);
        }
    }
    
}

#Thread1.java

/*
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package java2.lesson05;

/**
 *
 * @author Diep.Tran
 */
public class Thread1 extends Thread{

    @Override
    public void run() {
        for (int i = 0; i < 10; i++) {
            SharedData.getInstance().changeX(i);
        }
    }
    
}

#Test.java

/*
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 */
package java2.lesson05;

/**
 *
 * @author Diep.Tran
 */
public class Test {
    public static void main(String[] args) {
        Thread3 t3 = new Thread3();
        Thread4 t4 = new Thread4();
        
        t3.start();
        t4.start();
    }
}

#SharedData.java

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package java2.lesson05;

/**
 *
 * @author Diep.Tran
 */
public class SharedData {
    int x;
    int rand;
    
    private static SharedData instance = null;
    
    private SharedData() {
        
    }
    
    public synchronized static SharedData getInstance() {
        if(instance == null) {
            instance = new SharedData();
        }
        return instance;
    }
    
    //t1 & t2 -> cung goi toi function
    //t1 & t2 -> queue -> xu ly tuan
    public synchronized void changeX(int delta) {
        System.out.println("x = " + x + ", delta = " + delta);
        x+=delta;
        System.out.println(">> x = " + x);
    }

    public int getRand() {
        return rand;
    }

    public void setRand(int rand) {
        this.rand = rand;
    }
    
    
}

#Main.java

/*
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package java2.lesson05;

/**
 *
 * @author Diep.Tran
 */
public class Main {
    public static void main(String[] args) {
        Thread1 t1 = new Thread1();
        Thread2 t2 = new Thread2();
        
        t1.start();
        t2.start();
    }
}