MyWaitNotify.java

public class MyWaitNotify {
    String myMonitorObject = "";
    boolean wasSignalled = false;

    public void doWait() {
        synchronized (myMonitorObject) {
            
            while(!wasSignalled) {
            try {
                myMonitorObject.wait();
            } catch (InterruptedException ex) {}
            wasSignalled = false;
        }
    }

    public void doNotify() {
        synchronized (myMonitorObject) {
        wasSignalled = true;
        myMonitorObject.notify();
    }
}