Here you can find the source of asSet(T... elements)
public static <T> Set<T> asSet(T... elements)
//package com.java2s; //License from project: Apache License import java.util.*; public class Main { public static <T> Set<T> asSet(T... elements) { Set<T> toReturn = new HashSet<>(); toReturn.addAll(Arrays.asList(elements)); return toReturn; }//from ww w. j av a 2s . co m public static <T> List<T> asList(T... elements) { List<T> toReturn = new ArrayList<>(); toReturn.addAll(Arrays.asList(elements)); return toReturn; } }