Apache Commons Lang v3 Source Code Files

Apache Commons Lang 3 is the 3rd version of Apache Commons Lang, which provides a host of helper utilities for the java.lang API.

Apache Commons Lang 3 Source Code files are provided in both binary packge (commons-lang3-3.12.0-bin.zip) and source package (commons-lang3-3.12.0-src.zip). You can download them at Apache Commons Lang Website.

Apache Commons Lang 3 Source Code has no dependencies and is compatible with Java 8 and newer versions. You can compile it to generate your own version of Apache Commons Lang 3 JAR file.

You can also browse the source code below:

✍: FYIcenter

org/apache/commons/lang3/builder/Builder.java

/*
 * 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.lang3.builder;

/**
 * <p>
 * The Builder interface is designed to designate a class as a <em>builder</em>
 * object in the Builder design pattern. Builders are capable of creating and
 * configuring objects or results that normally take multiple steps to construct
 * or are very complex to derive.
 * </p>
 *
 * <p>
 * The builder interface defines a single method, {@link #build()}, that
 * classes must implement. The result of this method should be the final
 * configured object or result after all building operations are performed.
 * </p>
 *
 * <p>
 * It is a recommended practice that the methods supplied to configure the
 * object or result being built return a reference to {@code this} so that
 * method calls can be chained together.
 * </p>
 *
 * <p>
 * Example Builder:
 * <pre><code>
 * class FontBuilder implements Builder&lt;Font&gt; {
 *     private Font font;
 *
 *     public FontBuilder(String fontName) {
 *         this.font = new Font(fontName, Font.PLAIN, 12);
 *     }
 *
 *     public FontBuilder bold() {
 *         this.font = this.font.deriveFont(Font.BOLD);
 *         return this; // Reference returned so calls can be chained
 *     }
 *
 *     public FontBuilder size(float pointSize) {
 *         this.font = this.font.deriveFont(pointSize);
 *         return this; // Reference returned so calls can be chained
 *     }
 *
 *     // Other Font construction methods
 *
 *     public Font build() {
 *         return this.font;
 *     }
 * }
 * </code></pre>
 *
 * Example Builder Usage:
 * <pre><code>
 * Font bold14ptSansSerifFont = new FontBuilder(Font.SANS_SERIF).bold()
 *                                                              .size(14.0f)
 *                                                              .build();
 * </code></pre>
 *
 *
 * @param <T> the type of object that the builder will construct or compute.
 *
 * @since 3.0
 */
@FunctionalInterface
public interface Builder<T> {

    /**
     * Returns a reference to the object being constructed or result being
     * calculated by the builder.
     *
     * @return the object constructed or result calculated by the builder.
     */
    T build();
}

org/apache/commons/lang3/builder/Builder.java

Or download all of them as a single archive file:

File name: commons-lang3-3.12.0-sources.jar
File size: 651724 bytes
Release date: 2020-01-22
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Download and Install commons-lang3-3.8.1-bin.zip

Download Apache Commons Lang v3 Source Package

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