Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (c) 2002-2012 Alibaba Group Holding Limited.
 * All rights reserved.
 *
 * 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.Collection;

import java.util.HashSet;

public class Main {

    public static <T> HashSet<T> createHashSet() {
        return new HashSet<T>();
    }

    public static <T, V extends T> HashSet<T> createHashSet(V... args) {
        if (args == null || args.length == 0) {
            return new HashSet<T>();
        } else {
            HashSet<T> set = new HashSet<T>(args.length);

            for (V v : args) {
                set.add(v);
            }

            return set;
        }
    }

    public static <T> HashSet<T> createHashSet(Iterable<? extends T> c) {
        HashSet<T> set;

        if (c instanceof Collection<?>) {
            set = new HashSet<T>((Collection<? extends T>) c);
        } else {
            set = new HashSet<T>();
            iterableToCollection(c, set);
        }

        return set;
    }

    private static <T> void iterableToCollection(Iterable<? extends T> c, Collection<T> list) {
        for (T element : c) {
            list.add(element);
        }
    }
}