synchronize two threads in java

I have two threads in my java programme, one is main thread and other thread is thread A which is spawned in main thread. now i want main thread to start thread A and wait till thread A has executed some part of its code in run method and thread A should suspend itself. main thread should then start running, run few lines of code and then again thread A should start from where it has stopped and vice versa. this should happen for n number of times. I am trying as belows:

Thread A class:

public class ThreadA implements Runnable {
    boolean suspended = false;
    boolean stopped = false;
    synchronized void stop() {
        stopped = true;
        suspended = false;
        notify();
    }
    synchronized void suspend() {
        suspended = true;
    }
    synchronized void resume() {
        suspended = false;
        notify();
    }
    void job() throws InterruptedException {
        for (int i = 0; i < 5; i++)
            synchronized (this) {
                System.out.println("performing job.");
                suspend();
                while (suspended) {
                    notify();
                    suspended = false;
                }
            }
    }
    @Override
    public void run() {
        try {
            job();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

MainThread:

public class MainThread {
    public static void main(String[] args) throws InterruptedException {
        ThreadA a1=new ThreadA();
        Thread t1=new Thread(a1);
        synchronized (t1) {
            t1.start();
            for (int i = 0; i < 5; i++) {
                t1.wait();
                System.out.println("perform some action");
                a1.resume();
            }

        }
    }
}

Expected output:

performing job.
perform some action
performing job.
perform some action
performing job.
perform some action
performing job.
perform some action
performing job.
perform some action

Actual output:

performing job.
performing job.
performing job.
performing job.
performing job.
perform some action

I don’t know why the whole for loop is getting executed in Thread A even when i’ve issued a notify() signal in job method.

Answer

Here is more simplified way

public class TwoThread {

    public static void main(String[] args) throws InterruptedException {
        ThreadA a1 = new ThreadA();
        Thread t1 = new Thread(a1);

        synchronized (a1) {
            t1.start();
            for (int i = 0; i < 5; i++) {
                a1.wait();
                System.out.println("perform some action " + i);
                a1.notify();
            }

        }
    }
}

public class ThreadA implements Runnable {
    boolean suspended = false;
    boolean stopped = false;

    void job() throws InterruptedException {
        for (int i = 0; i < 5; i++)
            synchronized (this) {
                System.out.println("performing job. " + i);
                notify();
                wait();
            }
    }

    public void run() {
        try {
            job();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

    }

}