Here you can find the source of asSet(int... values)
public static Set<Integer> asSet(int... values)
//package com.java2s; /*//from ww w. ja va 2 s.com * Licensed to GraphHopper and Peter Karich under one or more contributor * license agreements. See the NOTICE file distributed with this work for * additional information regarding copyright ownership. * * GraphHopper licenses this file to you 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.*; public class Main { public static Set<Integer> asSet(int... values) { Set<Integer> s = new HashSet<Integer>(); for (int v : values) { s.add(v); } return s; } }