Here you can find the source of addTo(Collection l, Object... os)
public static <T extends Collection> T addTo(Collection l, Object... os)
//package com.java2s; /*/*from w w w . j a va 2 s . c om*/ * Copyright (c) 2013 GigaSpaces Technologies Ltd. All rights reserved * * 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.Collection; import java.util.Collections; public class Main { public static <T extends Collection> T addTo(Collection l, Object... os) { Collections.addAll(l, os); return (T) l; } }