T1: sinh ngau nhien 1 so tu nhien N (0->20)
Neu rad: chan -> T2: in ra binh phuong
Neu ra: le -> T3: in so lap phuong

T1:.....6.....              ......3.......                .......1........
T2:           ......36......
T3:                                       ......9.........                .......1......
T4:
T5:
T6:
T7:
T8:

Trong TH dong 3 Thread -> xu ly nhu the nao???

#Main.java

/*
 * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
 * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
 */
package java2.lesson05;

/**
 *
 * @author diepvan
 */
public class Main {
    public static void main(String[] args) {
        SharedData sharedData = new SharedData();
        
        Thread1 t1 = new Thread1(sharedData);
        Thread2 t2 = new Thread2(sharedData);
        Thread3 t3 = new Thread3(sharedData);
        
        t1.start();
        t2.start();
        t3.start();
    }
}

#SharedData.java

/*
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 * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
 */
package java2.lesson05;

/**
 *
 * @author diepvan
 */
public class SharedData {
    public static final int THREAD_1 = 1;
    public static final int THREAD_2 = 2;
    public static final int THREAD_3 = 3;
    
    int currentThread = THREAD_1;
    
    int rad;
    boolean live = true;

    public int getRad() {
        return rad;
    }

    public void setRad(int rad) {
        this.rad = rad;
    }

    public int getCurrentThread() {
        return currentThread;
    }

    public void setCurrentThread(int currentThread) {
        this.currentThread = currentThread;
    }

    public boolean isLive() {
        return live;
    }

    public void setLive(boolean live) {
        this.live = live;
    }
    
    
}

#Thread1.java

/*
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 * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
 */
package java2.lesson05;

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

/**
 *
 * @author diepvan
 */
public class Thread1 extends Thread{
    SharedData sharedData;

    public Thread1(SharedData sharedData) {
        this.sharedData = sharedData;
    }
    
    @Override
    public void run() {
        try {
            Thread.sleep(100);
        } catch (InterruptedException ex) {
            Logger.getLogger(Thread1.class.getName()).log(Level.SEVERE, null, ex);
        }
        
        Random random = new Random();
        
        for (int i = 0; i < 20; i++) {
            synchronized (sharedData) {
                int rad = random.nextInt(20);
                sharedData.setRad(rad);
                System.out.println("T1: " + rad);
                
                if(rad % 2 == 0) {
                    sharedData.setCurrentThread(SharedData.THREAD_2);
                } else {
                    sharedData.setCurrentThread(SharedData.THREAD_3);
                }
                sharedData.notifyAll();
                try {
                    while(sharedData.getCurrentThread() != SharedData.THREAD_1) {
                        sharedData.wait();
                    }
                } catch (InterruptedException ex) {
                    Logger.getLogger(Thread1.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
        
        sharedData.setLive(false);
        
        synchronized (sharedData) {
            sharedData.notifyAll();
        }
        System.out.println("T1 stop");
    }
    
}

#Thread2.java

/*
 * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
 * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
 */
package java2.lesson05;

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

/**
 *
 * @author diepvan
 */
public class Thread2 extends Thread {

    SharedData sharedData;

    public Thread2(SharedData sharedData) {
        this.sharedData = sharedData;
    }

    @Override
    public void run() {
        while (sharedData.isLive()) {
            synchronized (sharedData) {
                sharedData.notifyAll();
                try {
                    while(sharedData.getCurrentThread() != SharedData.THREAD_2 && sharedData.isLive()) {
                        sharedData.wait();
                    }
                    if(!sharedData.isLive()) {
                        break;
                    }
                } catch (InterruptedException ex) {
                    Logger.getLogger(Thread1.class.getName()).log(Level.SEVERE, null, ex);
                }

                int rad = sharedData.getRad();
                System.out.println("T2: " + rad * rad);
                
                sharedData.setCurrentThread(SharedData.THREAD_1);
            }
        }
        
        synchronized (sharedData) {
            sharedData.notifyAll();
        }
        System.out.println("T2 stop");
    }

}

#Thread3.java

/*
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 */
package java2.lesson05;

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

/**
 *
 * @author diepvan
 */
public class Thread3 extends Thread{
    SharedData sharedData;

    public Thread3(SharedData sharedData) {
        this.sharedData = sharedData;
    }
    
    @Override
    public void run() {
        while (sharedData.isLive()) {
            synchronized (sharedData) {
                sharedData.notifyAll();
                try {
                    while(sharedData.getCurrentThread() != SharedData.THREAD_3 && sharedData.isLive()) {
                        sharedData.wait();
                    }
                    if(!sharedData.isLive()) {
                        break;
                    }
                } catch (InterruptedException ex) {
                    Logger.getLogger(Thread1.class.getName()).log(Level.SEVERE, null, ex);
                }

                int rad = sharedData.getRad();
                System.out.println("T3: " + rad * rad * rad);
                
                sharedData.setCurrentThread(SharedData.THREAD_1);
            }
        }
        
        System.out.println("T3 stop");
    }
    
}