JAVA EE: Java Tutorial: Java Synchronization (Synchronization in java

Tuesday 7 February 2017

Java Tutorial: Java Synchronization (Synchronization in java | synchronized block in java_V1)

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Java Tutorial: Java Synchronization (Synchronization in java | synchronized block in java_V1)

Table.java

public class Table
{
    public void printTable(int n)
    {

        /*
         * Synchronized block
         */
        synchronized (this)
        {
            System.out.println("Thread Name = "
                    + Thread.currentThread().getName());
            for (int i = 1; i <= 5; i++)
            {
                System.out.println(n * i);
                try
                {
                    Thread.sleep(1000);
                }
                catch (Exception e)
                {
                    System.out.println(e);
                }
            }
        }
    }
}

Thread1.java

public class Thread1 extends Thread
{
    private Table t;

    public Thread1(Table t,String threadName)
    {
        super(threadName);
        this.t = t;
    }

    public void run()
    {
        t.printTable(5);
    }

}

Thread2.java

public class Thread2 extends Thread
{
    private Table t;

    public Thread2(Table t,String threadName)
    {
        super(threadName);
        this.t = t;
    }

    public void run()
    {
        t.printTable(50);
    }

}

SynchronizationDemo.java

import java.io.IOException;

public class SynchronizationDemo
{

    public static void main(String[] args) throws IOException
    {
        Table tableObj = new Table();
        Thread1 t1 = new Thread1(tableObj,"Thread 1");
        Thread2 t2 = new Thread2(tableObj,"Thread 2");
        t1.start();
        t2.start();
    }

}

Output

-------------------------------------
If printTable method has synchronized block,
then below will be the output:
-------------------------------------

Thread Name = Thread 1
5
10
15
20
25
Thread Name = Thread 2
50
100
150
200
250

-----------------------------------------
If printTable method does not have synchronized block,
then below will be the output:
-----------------------------------------
Thread Name = Thread 2
50
Thread Name = Thread 1
5
100
10
150
15
200
20
25
250