Here you can find the source of lockAll(List
public static Stack<Lock> lockAll(List<Lock> locks)
//package com.java2s; /******************************************************************************* * Copyright (c)2014 Prometheus Consulting * * 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.// ww w. jav a2s . c om *******************************************************************************/ import java.util.List; import java.util.Stack; import java.util.concurrent.locks.Lock; public class Main { public static Stack<Lock> lockAll(List<Lock> locks) { Stack<Lock> lockedLocks = new Stack<Lock>(); for (Lock lock : locks) { if (lock.tryLock()) { lockedLocks.push(lock); } else { break; } } return lockedLocks; } }