TestCreateMultipleTasks.java

package object_out;

import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.RecursiveAction;

public class TestCreateMultipleTasks {
	
	public int method(int num) {
		int processorCount = Runtime.getRuntime().availableProcessors();
		ForkJoinPool pool = new ForkJoinPool(processorCount);
		MethodImpl aMethodImpl = new MethodImpl(num);
		pool.invoke(aMethodImpl);
		return aMethodImpl.result;
	}

	public class MethodImpl extends RecursiveAction {
		private int num;
		private int result;
		private MethodImpl(int num) {
			this.num = num;
		}
		protected void compute() {
			if ((num < 10)) {
				result = method(num);
				return;
			} else {
				MethodImpl task1 = new MethodImpl(num - 1);
				MethodImpl task2 = new MethodImpl(num - 2);
				MethodImpl task3 = new MethodImpl(num - 3);
				invokeAll(task1, task2, task3);
				int i = task1.result;
				int j = task2.result;
				int k = task3.result;
				result = i + j + k;
			}
		}
		public int method(int num) {
			if (num <= 0) {
				return 0;
			} else {
				int i = method(num - 1);
				int j = method(num - 2);
				int k = method(num - 3);
				return i + j + k;
			}
		}
	}
}