Repeat delayed task n times

i want to run a portion of code n times with delay of some seconds.

here is my code:

 Runnable runnable = new Runnable() {
        @Override
        public void run() {
            Log.e("myLog","Runnable()-->Run()");
               // do a task here
        }
    };

Handler handler = new Handler();
    // loop repeating task 6 times
    for (int count = 0; count < 6; count++){
        Log.e("Log","Task loop "+count);

        handler.postDelayed(runnable, 20000);    // run task after 20 seconds
    }

Problem: the for loop running all the tasks concurrently. i want to run delayed task one by one.

i found a answer at post :- Repeat a task with a time delay?

but it repeating job infinite times.

i found very close logic to my question:- Bukkit Delayed Task Inside a For Loop

but doesn't looks relevant to me

 import java.util.Timer;
 import java.util.TimerTask;
 import java.util.concurrent.TimeUnit;
 class RepeatableTask extends TimerTask{
    int repeats;
    Timer time;
    public RepeatableTask(int repeats){
        this.repeats=repeats;
    }
    void init(){
        time = new Timer();
        time.schedule(this,0,TimeUnit.MINUTES.toMillis(delayInMinutes));
    }
    void stop(){
        time.cancel();
    }
    void run(){
        if(repeats == 0){stop();}
        new Thread->{
            //task
        }
        repeats--;
    }
}

//usage
RepeatableTask taskObject = new RepeatableTask(5);
taskObject.init();