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Java Object Class final void wait(long ms , int ns) method with Example

Java Object class final void wait(long ms , int ns) method: Here, we are going to learn about the final void wait(long ms , int ns) method of Object class with its syntax and example.
Submitted by Preeti Jain, on June 28, 2019

Object Class final void wait(long ms , int ns)

• This method is available in java.lang.Object.wait(long ms, int ns).
• This method causes the current thread to wait for a specified amount of time in milliseconds and nanoseconds until another thread notification by calling notify() or notifyAll() method of the object.
• This method throws an InterruptedException when other thread interrupted current thread.
• This method can't override because it is final.
• The time will be given in the method is of milliseconds and nanoseconds.

Syntax:

    final void wait(long ms, int ns){
    }

Parameter(s):

Here we are passing two-time parameter one is in milliseconds and another is in nanoseconds(How long a thread has to wait i.e. we have to mention time in milliseconds and if want extra time then we can mention time in nanoseconds as well) as a parameter in the method of the Object class.

Return value:

The return type of this method is void that means this method returns nothing after execution.

Java program to demonstrate example of Object Class wait(long ms , int ns) method

import java.lang.Object;

public class Thread1 {
    public static void main(String[] args) throws InterruptedException {

        // Create an object of Thread2

        Thread2 t2 = new Thread2();

        // By calling start() so Thread start() will exceute
        t2.start();

        Thread.sleep(1000);

        synchronized(t2) {

            System.out.println("Main thread trying to call wait()");

            // By calling wait() causes the current thread to wait 
            // for 1000 milliseconds until another   thread notification
            t2.wait(1000);

            System.out.println("Main Thread get notification here");
            System.out.println(t2.total);

        }

    }
}

class Thread2 extends Thread {

    int total = 0;

    public void run() {

        synchronized(this) {

            System.out.println("Thread t2 starts notification");

            for (int i = 0; i < 50; ++i) {

                total = total + i;
            }

            System.out.println("Thread t2 trying to given notification");

            this.notify();

        }

    }
}

Output

D:\Programs>javac Thread1.java

D:\Programs>java Thread1
Main thread trying to call wait()
Thread t2 starts notification
Thread t2 trying to given notification
Main Thread get notification here
190