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Java example source code file (Immutable.java)

This example source code file (Immutable.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 tags/keywords

annotation, documented, immutable, runtime, the

The Immutable.java example 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.
 * ====================================================================
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
package org.apache.http.annotation;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

 * The class to which this annotation is applied is immutable.  This means that
 * its state cannot be seen to change by callers, which implies that
 * <ul>
 * <li> all public fields are final, 
 * <li> all public final reference fields refer to other immutable objects, and 
 * <li> constructors and methods do not publish references to any internal state
 *      which is potentially mutable by the implementation. </li>
 * </ul>
 * Immutable objects may still have internal mutable state for purposes of performance
 * optimization; some state variables may be lazily computed, so long as they are computed
 * from immutable state and that callers cannot tell the difference.
 * <p>
 * Immutable objects are inherently thread-safe; they may be passed between threads or
 * published without synchronization.
 * <p>
 * Based on code developed by Brian Goetz and Tim Peierls and concepts
 * published in 'Java Concurrency in Practice' by Brian Goetz, Tim Peierls,
 * Joshua Bloch, Joseph Bowbeer, David Holmes and Doug Lea.
@Retention(RetentionPolicy.CLASS) // The original version used RUNTIME
public @interface Immutable {

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