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package test;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
public class TestExecutor {
public static void main(String[] args) throws Exception {
ExecutorService es = Executors.newCachedThreadPool();// 创建线程池对象
List<Future<String>> result = new ArrayList<Future<String>>();// 放结果用的集合
for (int i = 0; i < 3; i++) {
Future<String> f = es.submit(new MyCall(i));// 线程执行完成以后可以通过引用获取返回值
System.out.println("Future<String>... ..." + i);
result.add(f);
}
for (Future<String> f : result) {
System.out.println("返回值:" + f.get());// 输出返回的值
}
System.out.println("完成....");
}
}
class MyCall implements Callable<String> {
private int seq;
public MyCall(int seq) {
this.seq = seq;
}
// 抛出异常并可以拥有返回值
public String call() throws Exception {
System.out.println("执行" + seq + "," + Thread.currentThread().getName());
Thread.sleep(3000);
System.out.println("Weak up " + seq);
return "完成" + seq;// 这是返回值
}
}