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Synchronized method in java


Synchronized method:

A method declared with synchronized keyword is known as synchronized method. A synchronized method can be static or non-static.

Example: multithreading example without synchronization.

MultiThreadExample.java

/**
 * This program is used to show the multithreading 
 * example without synchronization.
 * @author codesjava
 */
class PrintTable{    
	//not-synchronized method.
	public void printTable(int n){  
       System.out.println("Table of " + n);
       for(int i=1;i<=10;i++){
           System.out.println(n*i);  
           try{  
        	 Thread.sleep(500);  
           }catch(Exception e){
        	 System.out.println(e);
           }  
        }       
     }   
}  
 
class MyThread1 extends Thread{  
    PrintTable pt;  
    MyThread1(PrintTable pt){  
    	this.pt=pt;  
    }  
    public void run(){ 
    	pt.printTable(2);  
    }        
}  
 
class MyThread2 extends Thread{  
	PrintTable pt;  
	MyThread2(PrintTable pt){  
		this.pt=pt;  
	}  
	public void run(){  
		pt.printTable(5);  
	}  
}  
 
public class MultiThreadExample{  
    public static void main(String args[]){
    	//creating PrintTable object.
    	PrintTable obj = new PrintTable();  
 
    	//creating threads.
	    MyThread1 t1=new MyThread1(obj);  
	    MyThread2 t2=new MyThread2(obj);  
 
	    //start threads.
	    t1.start();  
	    t2.start();  
    }  
}

Output:

Table of 5
Table of 2
2
5
4
10
6
15
8
20
10
25
12
30
14
35
16
40
18
45
50
20

Download this example.

Example: Non-static synchronized method.

MultiThreadExample.java

/**
 * This program is used to show the multithreading 
 * example with synchronization.
 * @author codesjava
 */
class PrintTable{    
	//synchronized method.
    public synchronized void printTable(int n){  
       System.out.println("Table of " + n);
       for(int i=1;i<=10;i++){
           System.out.println(n*i);  
           try{  
        	 Thread.sleep(500);  
           }catch(Exception e){
        	 System.out.println(e);
           }  
        }       
    }  
}  
 
class MyThread1 extends Thread{  
    PrintTable pt;  
    MyThread1(PrintTable pt){  
    	this.pt=pt;  
    }  
    public void run(){ 
    	pt.printTable(2);  
    }        
}  
 
class MyThread2 extends Thread{  
	PrintTable pt;  
	MyThread2(PrintTable pt){  
		this.pt=pt;  
	}  
	public void run(){  
		pt.printTable(5);  
	}  
}  
 
public class MultiThreadExample{  
    public static void main(String args[]){
    	//creating PrintTable object.
    	PrintTable obj = new PrintTable();  
 
    	//creating threads.
	    MyThread1 t1=new MyThread1(obj);  
	    MyThread2 t2=new MyThread2(obj);  
 
	    //start threads.
	    t1.start();  
	    t2.start();  
    }  
}

Output:

Table of 2
2
4
6
8
10
12
14
16
18
20
Table of 5
5
10
15
20
25
30
35
40
45
50

Download this example.
 
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