Phan 1:

#Main.java

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package java2.lesson05;

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

/**
 * Main Thread
 *
 * @author Diep.Tran
 */
public class Main {

    public static void main(String[] args) {
        System.out.println("Main Thread start ...");
        System.out.println("step 1");

        //Khoi tao luong moi. T1
        Thread t1 = new Thread(new Runnable() {
            @Override
            public void run() {
//                Scanner scan = new Scanner(System.in);
                //Bat dau xu ly code cua luong moi.
                for (int i = 0; i < 30; i++) {
//                    System.out.println("T1 -> enter -> ");
//                    int v1 = scan.nextInt();
                    System.out.println("T1 -> " + i);
                }
            }
        });

        //Khoi tao luong T2
        Thread t2 = new Thread(new Runnable() {
            @Override
            public void run() {
//                Scanner scan = new Scanner(System.in);
                //T2 -> xu ly khoi code trong T2
                for (int i = 0; i < 30; i++) {
                    System.out.println("T2 -> enter -> ");
//                    int v2 = scan.nextInt();
                    System.out.println("T2 -> " + 2);
                }
            }
        });
        t1.start();//Bat dau chay luong T1
        try {
            t1.join();
        } catch (InterruptedException ex) {
            Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
        }
        t2.start();//T2 bat dau chay
        System.out.println("step 2");

        System.out.println("Main Thread stop");
    }
}

#Test.java

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package java2.lesson05;

/**
 *
 * @author Diep.Tran
 */
public class Test {
    public static void main(String[] args) {
        //Khoi tao Thread : Tong cong 3 thread -> Main, T1, T2
        //Ton tai duy nhat Main thread
        System.out.println("Main -> step -> 1");//Main
        CustomThread t1 = new CustomThread();//Main
        System.out.println("Main -> step -> 2");//Main
        t1.setName("T1");//Main
        System.out.println("Main -> step -> 3");//Main
        CustomThread t2 = new CustomThread();//Main
        System.out.println("Main -> step -> 4");//Main
        t2.setName("T2");//Main
        System.out.println("Main -> step -> 5");//Main
        //Bat thread chay
        t2.start();//Main + T2 bat dau chay
        System.out.println("Main -> step -> 6");//Main + T2 (Ton tai T2)
        t1.start();//Main + T2 (Ton tai T2) + T1 (Bat dau chay)
        System.out.println("Main -> step -> 7");//Main + T2 (Co The Ton tai T2) + T1 (Co The Ton tai T1)
        for (int i = 0; i < 10; i++) {
            System.out.println("Main -> " + i);//Main + T2 (Co The Ton tai T2) + T1 (Co The Ton tai T1)
        }
        System.out.println("Stop");//Main + T2 (Co The Ton tai T2) + T1 (Co The Ton tai T1)
    }
}

#CustomThread.java

/*
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 * To change this template file, choose Tools | Templates
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 */
package java2.lesson05;

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

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

    @Override
    public void run() {
        System.out.println("Bat dau xu ly 1 luong moi -> " + getName());
        
        for (int i = 0; i < 20; i++) {
            try {
                Thread.sleep(1000);
                
                System.out.println(getName() + " -> " + i);
            } catch (InterruptedException ex) {
                Logger.getLogger(CustomThread.class.getName()).log(Level.SEVERE, null, ex);
            }
        }
    }
    
}

#TestThread02.java

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package java2.lesson05;

/**
 *
 * @author Diep.Tran
 */
public class TestThread02 extends Thread {

    boolean isAdd = false;
    SharedData sharedData;

    public TestThread02(SharedData sharedData, boolean isAdd) {
        this.isAdd = isAdd;
        this.sharedData = sharedData;
    }

    @Override
    public void run() {
        for (int i = 0; i < 30; i++) {
            if (isAdd) {
                synchronized (sharedData) {
                    sharedData.plus(1);
                }
            } else {
                synchronized (sharedData) {
                    sharedData.minus(1);
                }
            }
        }
    }
}

#MultiThreadTest01.java

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package java2.lesson05;

/**
 *
 * @author Diep.Tran
 */
public class MultiThreadTest01 {
    static class TestThread01 extends Thread {
        @Override
        public void run() {
            for (int i = 0; i < 10; i++) {
                addMore(1);
            }
        }
    }
    
    public static void main(String[] args) {
        SharedData sharedData = new SharedData();
        
        TestThread02 t1 = new TestThread02(sharedData, true);
        TestThread02 t2 = new TestThread02(sharedData, true);
        TestThread02 t3 = new TestThread02(sharedData, false);
        TestThread02 t4 = new TestThread02(sharedData, false);
        TestThread02 t5 = new TestThread02(sharedData, false);
        
        t1.start();
        t2.start();
        t3.start();
        t4.start();
        t5.start();
    }
    
    /**
     * Thuc hien kiem tra da luong tren 1 function
     */
    static void testSync01() {
        TestThread01 t1 = new TestThread01();
        TestThread01 t2 = new TestThread01();
        TestThread01 t3 = new TestThread01();
        
        t1.start();
        t2.start();
        t3.start();
    }
    
    static int count = 0;
    static synchronized void addMore(int delta) {
        System.out.println("Before: " + count + ", delta: " + delta);
        count+=delta;
        System.out.println("After: " + count);
    }
}

#SharedData.java

/*
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package java2.lesson05;

/**
 *
 * @author Diep.Tran
 */
public class SharedData {
    int count = 0;
    
    public synchronized void addMore(int delta, boolean isAdd) {
        if(isAdd) {
            plus(delta);
        } else {
            minus(delta);
        }
    }
    
    public void plus(int delta) {
        System.out.println("Before: " + count + ", delta: " + delta);
        count+=delta;
        System.out.println("After: " + count);
    }
    
    public void minus(int delta) {
        System.out.println("~~~Before: " + count + ", delta: " + delta);
        count-=delta;
        System.out.println("~~~After: " + count);
    }
}