What is Synchronization in Java

What is Synchronization in Java

Synchronization in java is the capability to control the access of multiple threads to any shared resource.

Example :

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package JavaPractice; import java.util.Date; public class TestSynchronization { public static void main(String[] args) { // TODO Auto-generated method stub Table obj = new Table(); MyThread1 th1 = new MyThread1(obj, true); // true for Synchronization MyThread2 th2 = new MyThread2(obj, true); th1.start(); th2.start(); } } class Table { // method not Synchronization void printTable(int n) { for (int i = 1; i <= 5; i++) { System.out.println(n * i); try { Thread.sleep(400); } catch (Exception e) { System.out.println(e); } } } // method is Synchronization synchronized void printTableSynchronization(int n) { for (int i = 1; i <= 5; i++) { System.out.println(n * i); try { Thread.sleep(400); } catch (Exception e) { System.out.println(e); } } } } class MyThread1 extends Thread { Table t; boolean isCallSynchronization; MyThread1(Table t, boolean isCallSynchronization) { this.t = t; this.isCallSynchronization = isCallSynchronization; } public void run() { if (this.isCallSynchronization) { System.out.println(new Date()); t.printTableSynchronization(5); System.out.println(new Date()); } else { System.out.println(new Date()); t.printTable(5); System.out.println(new Date()); } } } class MyThread2 extends Thread { Table t; boolean isCallSynchronization; MyThread2(Table t, boolean isCallSynchronization) { this.t = t; this.isCallSynchronization = isCallSynchronization; } public void run() { if (this.isCallSynchronization) { System.out.println(new Date()); t.printTableSynchronization(100); System.out.println(new Date()); } else { System.out.println(new Date()); t.printTable(100); System.out.println(new Date()); } } }