JavaRocksPrinter.java

package ca.bazlur;

public class JavaRocksPrinter {
    private final int times;

    public JavaRocksPrinter(int times) {
        this.times = times;
    }

    public void printJava(Runnable action) {
        for (int i = 0; i < times; i++) {
            action.run();
        }
    }

    public void printRocks(Runnable action) {
        for (int i = 0; i < times; i++) {
            action.run();
        }
    }


    public static void main(String[] args) throws InterruptedException {
        var javaRocks = new JavaRocks(10);

        var javaPrinter = Thread.ofPlatform()
                .unstarted(() -> javaRocks.printJava(() -> System.out.print("Java ")));
        var rocksPrinter = Thread.ofPlatform()
                .unstarted(() -> javaRocks.printRocks(() -> System.out.print("Rocks!\n")));

        javaPrinter.start();
        rocksPrinter.start();

        javaPrinter.join();
        rocksPrinter.join();
    }
}


//Output: 
//Java Rocks!
//Java Rocks!
//Java Rocks!
//Java Rocks!
//Java Rocks!
//Java Rocks!
//Java Rocks!
//Java Rocks!
//Java Rocks!
//Java Rocks!

https://gist.github.com/rxrav/a52bf9e207d0c6cc22ba7d2390da431b