3 Threads Printing numbers in sequence

Question

I am trying to write a simple code to print numbers in sequence. Scenario is like

Thread  Number
T1        1
T2        2
T3        3
T1        4
T2        5
T3          


        

Answer 1

Below is very generic code. i agree it is not good practice to use multiple threads for such cases

class MultipleThreads implements Runnable {

AtomicInteger integer;

int max_val = 100;

int remainder;
int numofThreads;

public MultipleThreads(AtomicInteger integer, int remainder, int numofThreads) {
    this.integer = integer;
    this.remainder = remainder;
    this.numofThreads = numofThreads;
}

@Override
public void run() {
    while (integer.intValue() <= max_val) {
        synchronized (integer) {

            while (integer.intValue() % numofThreads != remainder) {
                try {
                    integer.wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            if (integer.intValue() > max_val)
                break;
            System.out.println("printing :" + Thread.currentThread().getName() + " : " + integer.getAndIncrement());
            integer.notifyAll();
        }
    }
}

}

public class ThreadSynchronization {

public static void main(String[] args) {
    AtomicInteger at = new AtomicInteger(1);
    MultipleThreads th1 = new MultipleThreads(at, 1, 5);
    MultipleThreads th2 = new MultipleThreads(at, 2, 5);
    MultipleThreads th3 = new MultipleThreads(at, 3, 5);
    MultipleThreads th4 = new MultipleThreads(at, 4, 5);
    MultipleThreads th5 = new MultipleThreads(at, 0, 5);

    new Thread(th1).start();
    new Thread(th2).start();
    new Thread(th3).start();
    new Thread(th4).start();
    new Thread(th5).start();
}

}