JAvaカスタムタスククラスタイミング実行タスク例callableとfutureインタフェースの使用方法
package com.yao;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
public class CallableAndFuture {
/**
* , Callable
*/
public static class MyCallableClass implements Callable {
//
private int flag = 0;
public MyCallableClass(int flag) {
this.flag = flag;
}
public String call() throws Exception {
if (this.flag == 0) {
// flag 0,
return "flag = 0";
}
if (this.flag == 1) {
// flag 1,
try {
while (true) {
System.out.println("looping......");
Thread.sleep(2000);
}
} catch (InterruptedException e) {
System.out.println("Interrupted");
}
return "false";
} else {
// falg 0 1,
throw new Exception("Bad flag value!");
}
}
}
public static void main(String[] args) {
// 3 Callable
MyCallableClass task1 = new MyCallableClass(0);
MyCallableClass task2 = new MyCallableClass(1);
MyCallableClass task3 = new MyCallableClass(2);
//
ExecutorService es = Executors.newFixedThreadPool(3);
try {
// , Future ,
// Future
Future future1 = es.submit(task1);
// , get ,
System.out.println("task1: " + future1.get());
Future future2 = es.submit(task2);
// 5 , 。
Thread.sleep(5000);
System.out.println("task2 cancel: " + future2.cancel(true));
// ,
//
Future future3 = es.submit(task3);
System.out.println("task3: " + future3.get());
} catch (Exception e) {
System.out.println(e.toString());
}
//
es.shutdownNow();
}
}