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  • Synchronized block

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    Synchronized block:

    Synchronized block is mainly used when there is a sharing of resources and it is used to lock an object for any shared resource so that at a particular time only one object can use that resource. By using synchronized block only one thread can use that resource at a particular time. It eliminates thread interference and consistency problem.

    Example:

        class Table{  
          
         void printTable(int n){  
           synchronized(this){//synchronized block  
             for(int i=1;i<=5;i++){  
              System.out.println(n*i);  
              try{  
               Thread.sleep(400);  
              }catch(Exception e){System.out.println(e);}  
             }  
           }  
         }//end of the method  
        }  
          
        class Thread1 extends Thread{  
        Table t;  
        Thread1(Table t){  
        this.t=t;  
        }  
        public void run(){  
        t.printTable(5);  
        }  
          
        }  
        class Thread2 extends Thread{  
        Table t;  
        Thread2(Table t){  
        this.t=t;  
        }  
        public void run(){  
        t.printTable(100);  
        }  
        }  
          
        public class SynchronizedBlock1{  
        public static void main(String args[]){  
        Table obj = new Table();//only one object  
        Thread1 t1=new Thread1(obj);  
        Thread2 t2=new Thread2(obj);  
        t1.start();  
        t2.start();  
        }  
        }  

    Output:

           5
           10
           15
           20
           25
           100
           200
           300
           400
           500

    Synchronized block can  throw  java.lang.NullPointerException if expression provided to block as parameter evaluates to null.

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