Java tutorial
//package com.java2s; /* * Copyright 2008-2016 the original author or authors. * * 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.Arrays; import java.util.Collections; import java.util.HashSet; import java.util.Set; public class Main { @SafeVarargs public static <T> Set<T> newSet(T... values) { if (values == null) { return Collections.emptySet(); } return new HashSet<>(Arrays.asList(values)); } }