Java tutorial
//package com.java2s; /** * Copyright 2010 The Kuali Foundation Licensed under the * Educational Community 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.osedu.org/licenses/ECL-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 { private final static Set<String> properties = new HashSet<String>(); public static Set<String> getProperties() { return Collections.unmodifiableSet(properties); } }