Here you can find the source of waitFor(Future
public static <T> T waitFor(Future<T> future) throws ExecutionException
//package com.java2s; /*/*from ww w. j av a2 s . c o m*/ * Copyright Terracotta, Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.util.concurrent.ExecutionException; import java.util.concurrent.Future; public class Main { public static <T> T waitFor(Future<T> future) throws ExecutionException { boolean interrupted = false; try { while (true) { try { return future.get(); } catch (InterruptedException e) { interrupted = true; } } } finally { if (interrupted) { Thread.currentThread().interrupt(); } } } }