Java tutorial
//package com.java2s; /** * Copyright 2013-present febit.org (support@febit.org) * * 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.*; public class Main { public static java.util.HashSet<Object> toSet(Object... args) { java.util.HashSet<Object> set = new java.util.HashSet<>(); if (args != null) { set.addAll(Arrays.asList(args)); } return set; } public static java.util.HashSet<String> toSet(String... args) { java.util.HashSet<String> set = new java.util.HashSet<>(); if (args != null) { set.addAll(Arrays.asList(args)); } return set; } }