Java Data Type Tutorial - Java Object.wait()

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Syntax

Object.wait() has the following syntax.

public final void wait()  throws InterruptedException

Example

In the following code shows how to use Object.wait() method.

//from   w  ww .  j a va  2 s  .c o m
class MyResource {
  boolean ready = false;

  synchronized void waitFor() throws Exception {
    System.out.println(Thread.currentThread().getName()
        + " is entering waitFor().");
    while (!ready)
      wait();

    System.out.println(Thread.currentThread().getName()
        + " resuming execution.");
  }

  synchronized void start() {
    ready = true;
    notify();
  }
}

class MyThread implements Runnable {
  MyResource myResource;

  MyThread(String name, MyResource so) {
    myResource = so;
    new Thread(this, name).start();
  }

  public void run() {

    try {
      myResource.waitFor();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}

public class Main {
  public static void main(String args[]) throws Exception {
    MyResource sObj = new MyResource();
    new MyThread("MyThread", sObj);
    for (int i = 0; i < 10; i++) {
      Thread.sleep(50);
      System.out.print(".");
    }
    sObj.start();
  }
}

The code above generates the following result.

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