创建不可修改的收藏集

// 来 自 时 代 J a v a - N o w J a v a . c o m

//package com.nowjava;

import java.util.ArrayList;


import java.util.Collection;

import java.util.Collections;


import java.util.LinkedList;

import java.util.List;


public class Main {

    public static void main(String[] argv) {

        Collection c = java.util.Arrays.asList("asdf", "nowjava.com");

        System.out.println(unmodifiableCollection(c));/*来自 n o w j a v a . c o m - 时代Java*/

    }


    /**

     * @return an <b>UNMODIFIABLE</b> Collection&lt;T&gt;

     */

    public static <T> Collection<T> unmodifiableCollection(

            final Collection<? extends T> c) {

        return (c == null) ? Collections.<T> emptyList() : Collections

                .unmodifiableCollection(c);

    }


    public static <T> List<T> asList(final Iterable<? extends T> iterable) {

        return (iterable instanceof Collection) ? new LinkedList<T>(

                (Collection<? extends T>) iterable) : new LinkedList<T>() {

            private static final long serialVersionUID = 3109256773218160485L;

            {

                if (iterable != null) {

                    for (final T t : iterable) {

                        add(t);

                    }

                }

            }

        };

    }