ThreadD.java

public class ThreadD extends Thread {
    private int time1 = 1;
    private static boolean setting1 = false;

    public synchronized int getTime1() {
        while (setting1) {
            try {
                wait();
            } catch (InterruptedException e) {
            }
        }
        return time1;
    }

    public synchronized void setTime1(int t) {
        this.time1 = t;
        setting1 = false;
        notifyAll();
    }

    public void run() {
        number();
    }

    public void number() {
        while (true) {
            for (; getTime1() < 16; ) {
                System.out.print(time1 + ", ");
                setTime1(time1 + 1);
                try {
                    sleep(750);
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
            }
        }
    }
}
class ThreadA extends Thread{
    ThreadD timer1;
    public ThreadA(ThreadD t){
        this.timer1 = t;
    }

    public void run(){
        synchronized(timer1){
            while(true){
                try {timer1.wait();} catch (InterruptedException e) {e.printStackTrace();}
                if((timer1.getTime1() % 3 == 0) && (timer1.getTime1() % 5 != 0)){
                    System.out.print("fizz, ");
                    timer1.setTime1(timer1.getTime1()+1);
                }
            }
        }
    }
}
class ThreadB extends Thread{
    ThreadD timer1;
    public ThreadB(ThreadD t){
        this.timer1 = t;
    }

    public void run(){
        synchronized(timer1){
            while(true){
                try {timer1.wait();} catch (InterruptedException e) {e.printStackTrace();}
                if(timer1.getTime1() % 5 == 0){
                    System.out.print("buzz, ");
                    timer1.setTime1(timer1.getTime1()+1);
                }
            }
        }
    }
}
class ThreadC extends Thread{
    ThreadD timer1;
    public ThreadC(ThreadD t){
        this.timer1 = t;
    }

    public void run(){
        synchronized(timer1){
            while(true){
                try {timer1.wait();} catch (InterruptedException e) {e.printStackTrace();}
                if((timer1.getTime1() % 3 == 0) && (timer1.getTime1() % 5 == 0)){
                    System.out.print("fizzbuzz, ");
                    timer1.setTime1(timer1.getTime1()+1);
                }
            }
        }
    }
}

class BuzzerTester {
    public static synchronized void main(String[] args) {

        ThreadD timer1 = new ThreadD();
        ThreadA t1 = new ThreadA(timer1);
        ThreadB t2 = new ThreadB(timer1);
        ThreadC t3 = new ThreadC(timer1);

            timer1.start();
            t1.start();
            t2.start();
            t3.start();

        }
    }