print even and odd number using 2 thread

ThreadEvenOddPrint.java

import java.util.concurrent.atomic.AtomicInteger;

/**
 * @author Hariom Yadav
 * @since 17-Nov-2023
 */
public class ThreadEvenOddPrint {

    /**
     * thread 1 will print even and other will print odd
     * approach : take share resources atomic int and using inside both runner
     * NOTE : approach same as producer and consumer pattern, they are accessing common counter resource `AtomicInteger`
     */
    @Test
    public void foo(){
        AtomicInteger atomic = new AtomicInteger(0);

        Runnable even = () -> {
            while (true) {
                sleep(1000);
                if (atomic.get() % 2 == 0) {
                    System.out.println("Even    = " + atomic.getAndIncrement());
                }
            }
        };

        Runnable odd = () -> {
            while (true) {
                sleep(1000);
                if (atomic.get() % 2 != 0) {
                    System.out.println("Odd     = " + atomic.getAndIncrement());
                }
            }
        };

        new Thread(even).start();
        new Thread(odd).start();

        Thread.sleep(400000);
    }

    private static void sleep(int millis) {
        try {
            Thread.sleep(millis);
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        }
    }
}

approach 2, same as above but refactored logic to a class : https://gist.github.com/hocyadav/232a3129a5e0a04c215d197c908a1ac8#file-threadevenoddprint-java

producer-consumer pattern impl using 2 thread : https://gist.github.com/hocyadav/58586e209215cca3ce88c80d7c0d1dc8