ForkJoinTaskDemo.java

import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.ForkJoinTask;

public class ForkJoinTaskDemo {

	public static void main(String[] args) throws Exception {

		ForkJoinPool pool = ForkJoinPool.commonPool();
		System.out.println("Pool size: " + pool.getParallelism());

		ForkJoinTask<String> t1 = ForkJoinTask.adapt(() -> {
			try {
				Thread.sleep(10000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			System.out.println("T1 completed");
			return "T1 result";
		});
		ForkJoinTask<String> t2 = ForkJoinTask.adapt(() -> {
			String t1Result = t1.join();
			System.out.println("T1 result: " + t1Result);
			return "T2 result";
		});
		
		pool.submit(t1);
		pool.submit(t2);
		
		String t2Result = t2.join();
		
		System.out.println("T2 result: " + t2Result);

	}

}