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Commons Collections example source code file (Unmodifiable.java)

This example Commons Collections source code file (Unmodifiable.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Collections tags/keywords

unmodifiable, unmodifiable

The Commons Collections Unmodifiable.java source code

/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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.
 */
package org.apache.commons.collections;

/**
 * Marker interface for collections, maps and iterators that are unmodifiable.
 * <p>
 * This interface enables testing such as:
 * <pre>
 * if (coll instanceof Unmodifiable) {
 *   coll = new ArrayList(coll);
 * }
 * // now we know coll is modifiable
 * </pre>
 * Of course all this only works if you use the Unmodifiable classes defined
 * in this library. If you use the JDK unmodifiable class via java util Collections
 * then the interface won't be there.
 *  
 * @since Commons Collections 3.0
 * @version $Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $
 *
 * @author Stephen Colebourne
 */
public interface Unmodifiable {
    // marker interface - no methods to implement
}

Other Commons Collections examples (source code examples)

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