Here you can find the source of asSet(T... element)
public static <T> Set<T> asSet(T... element)
//package com.java2s; /*// w w w . j a v a 2 s .co m * Copyright 2002-2006,2009 The Apache Software Foundation. * * 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.Collections; import java.util.HashSet; import java.util.Set; public class Main { public static <T> Set<T> asSet(T... element) { HashSet<T> elements = new HashSet<T>(element.length); Collections.addAll(elements, element); return elements; } }