package cn.temp.temp;import java.util.concurrent.ForkJoinPool;import java.util.concurrent.RecursiveTask;// F:\myeclipseWorker\temp\bin\cn\temp\temp// java -classpath .; cn.temp.temp.Temp// java -classpath . cn.temp.temp.Temppublic class Temp {    public static void main(String[] args) throws Exception {        long start;        int count = 20;                start = System.currentTimeMillis();        int value = a(count);        System.out.println(value);        System.out.println("用时：" + (System.currentTimeMillis() - start) + " ms");        start = System.currentTimeMillis();        ForkJoinPool pool = new ForkJoinPool();        Task task = new Task(count);        pool.invoke(task);        System.out.println(task.getRawResult());        System.out.println("用时：" + (System.currentTimeMillis() - start) + " ms");    }    public static int a(int j) {        if (j <= 2)            return 1;        return a(j - 2) + a(j - 1);    }}@SuppressWarnings("serial")class Task extends RecursiveTask
     
       {    int    i;    Task(int i) {        super();        this.i = i;    }    @Override    protected Integer compute() {        if (i <= 2)            return 1;        Task t1 = new Task(i - 1);        Task t2 = new Task(i - 2);        invokeAll(t1, t2);        return t1.getRawResult() + t2.getRawResult();    }}