java的Future用法
首先,Future是一个接口,该接口用来返回异步的结果。
package com.itbuluoge.mythread; import java.util.ArrayList; import java.util.concurrent.Callable; import java.util.concurrent.ExecutionException; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import java.util.concurrent.Future; import java.util.concurrent.TimeUnit; class TaskWithResult implements Callable<String> { public String call() throws Exception { // TODO Auto-generated method stub Thread.sleep(1000); return "OK"; } } public class CallableDemo { /** * @param args * @throws Exception * @throws InterruptedException */ public static void main(String[] args) throws InterruptedException, Exception { // TODO Auto-generated method stub ExecutorService exec=Executors.newCachedThreadPool(); Future<String> st=exec.submit(new TaskWithResult()); /*同步结果,并且设置超时时间*/ System.out.println(st.get(10000, TimeUnit.MILLISECONDS)); System.out.println("over"); } }
输出结果
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