Java Static Synchronization

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When a static method is synchronized, then the lock will be on the class not on the object.

Syntax

 synchronized static Method_Name() {
// statements
}
Static synchronized

Problem

If you're using two objects object1 and object2 which shared the class. In this situation, D1 and D2 or D3 and D4 didn't interfere because of the synchronized method. But D1 and D3, or D2 and D4 can be interference because of D1 or D2 acquires the lock and D3 or D4 acquires another lock. To solve this problem static synchronization is needed.

Example:

 class Calculate {
     synchronized static void show(int n) {
        try {
            for(int i=1;i<=3;i++){  
                System.out.println(n*i);
                Thread.sleep(500);
            }
        } catch(InterruptedException e) {
            System.out.println("Interrupted");
        }
    }
}
class Data implements Runnable {
    int n;
    Calculate ca;
    Thread t;
    public Data(Calculate c, int num) {
        ca = c;
        n = num;
        t = new Thread(this);
        t.start();
    }
    public void run() {
        ca.show(n);
    }
}
public class StaticSynchronization{
    public static void main(String args[]) {
        Calculate ca = new Calculate();
        Data d1= new Data(ca, 10);
        Data d2= new Data(ca, 100);
        try {
            d1.t.join();
            d2.t.join();
        } catch(InterruptedException e) {
            System.out.println("Interrupted");
        }
    }
}
Run ›
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