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class="sidebar-link">Java Memory Management</a></li><li><a href="/java/java-performance-tuning.html" class="sidebar-link">Java Performance Tuning</a></li><li><a href="/java/benchmarks.html" class="sidebar-link">Benchmarks</a></li><li><a href="/java/fileupload-to-aws.html" class="sidebar-link">FileUpload to AWS</a></li><li><a href="/java/appdynamics-and-tibco-businessworks-instrumentation-for-easy-integration.html" class="sidebar-link">AppDynamics and TIBCO BusinessWorks Instrumentation for Easy Integration</a></li><li><a href="/java/the-classpath.html" class="sidebar-link">The Classpath</a></li><li><a href="/java/resources-on-classpath.html" class="sidebar-link">Resources (on classpath)</a></li><li><a href="/java/contributors.html" class="sidebar-link">The Contributors</a></li></ul></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="apache-commons-lang"><a href="#apache-commons-lang" class="header-anchor">#</a> Apache Commons Lang</h1> <h2 id="implement-equals-method"><a href="#implement-equals-method" class="header-anchor">#</a> Implement equals() method</h2> <p>To implement the <code>equals</code> method of an object easily you could use the <code>EqualsBuilder</code> class.</p> <p>Selecting the fields:</p> <div class="language-java extra-class"><pre class="language-java"><code><span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token keyword">boolean</span> <span class="token function">equals</span><span class="token punctuation">(</span><span class="token class-name">Object</span> obj<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">if</span><span class="token punctuation">(</span><span class="token operator">!</span><span class="token punctuation">(</span>obj <span class="token keyword">instanceof</span> <span class="token class-name">MyClass</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token class-name">MyClass</span> theOther <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token class-name">MyClass</span><span class="token punctuation">)</span> obj<span class="token punctuation">;</span>
<span class="token class-name">EqualsBuilder</span> builder <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">EqualsBuilder</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
builder<span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span>field1<span class="token punctuation">,</span> theOther<span class="token punctuation">.</span>field1<span class="token punctuation">)</span><span class="token punctuation">;</span>
builder<span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span>field2<span class="token punctuation">,</span> theOther<span class="token punctuation">.</span>field2<span class="token punctuation">)</span><span class="token punctuation">;</span>
builder<span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span>field3<span class="token punctuation">,</span> theOther<span class="token punctuation">.</span>field3<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> builder<span class="token punctuation">.</span><span class="token function">isEquals</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><p>Using reflection:</p> <div class="language-java extra-class"><pre class="language-java"><code><span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token keyword">boolean</span> <span class="token function">equals</span><span class="token punctuation">(</span><span class="token class-name">Object</span> obj<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token class-name">EqualsBuilder</span><span class="token punctuation">.</span><span class="token function">reflectionEquals</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> obj<span class="token punctuation">,</span> <span class="token boolean">false</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><p>the boolean parameter is to indicates if the equals should check transient fields.</p> <p>Using reflection avoiding some fields:</p> <div class="language-java extra-class"><pre class="language-java"><code><span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token keyword">boolean</span> <span class="token function">equals</span><span class="token punctuation">(</span><span class="token class-name">Object</span> obj<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token class-name">EqualsBuilder</span><span class="token punctuation">.</span><span class="token function">reflectionEquals</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> obj<span class="token punctuation">,</span> <span class="token string">"field1"</span><span class="token punctuation">,</span> <span class="token string">"field2"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><h2 id="implement-hashcode-method"><a href="#implement-hashcode-method" class="header-anchor">#</a> Implement hashCode() method</h2> <p>To implement the <code>hashCode</code> method of an object easily you could use the <code>HashCodeBuilder</code> class.</p> <p>Selecting the fields:</p> <div class="language-java extra-class"><pre class="language-java"><code><span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token keyword">int</span> <span class="token function">hashCode</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token class-name">HashCodeBuilder</span> builder <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">HashCodeBuilder</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
builder<span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span>field1<span class="token punctuation">)</span><span class="token punctuation">;</span>
builder<span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span>field2<span class="token punctuation">)</span><span class="token punctuation">;</span>
builder<span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span>field3<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> builder<span class="token punctuation">.</span><span class="token function">hashCode</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><p>Using reflection:</p> <div class="language-java extra-class"><pre class="language-java"><code><span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token keyword">int</span> <span class="token function">hashCode</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token class-name">HashCodeBuilder</span><span class="token punctuation">.</span><span class="token function">reflectionHashCode</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> <span class="token boolean">false</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><p>the boolean parameter indicates if it should use transient fields.</p> <p>Using reflection avoiding some fields:</p> <div class="language-java extra-class"><pre class="language-java"><code><span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token keyword">int</span> <span class="token function">hashCode</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token class-name">HashCodeBuilder</span><span class="token punctuation">.</span><span class="token function">reflectionHashCode</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> <span class="token string">"field1"</span><span class="token punctuation">,</span> <span class="token string">"field2"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><h2 id="implement-tostring-method"><a href="#implement-tostring-method" class="header-anchor">#</a> Implement toString() method</h2> <p>To implement the <code>toString</code> method of an object easily you could use the <code>ToStringBuilder</code> class.</p> <p>Selecting the fields:</p> <div class="language-java extra-class"><pre class="language-java"><code><span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token class-name">String</span> <span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token class-name">ToStringBuilder</span> builder <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ToStringBuilder</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
builder<span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span>field1<span class="token punctuation">)</span><span class="token punctuation">;</span>
builder<span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span>field2<span class="token punctuation">)</span><span class="token punctuation">;</span>
builder<span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span>field3<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> builder<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><p>Example result:</p> <div class="language-java extra-class"><pre class="language-java"><code><span class="token class-name"><span class="token namespace">ar<span class="token punctuation">.</span>com<span class="token punctuation">.</span>jonat<span class="token punctuation">.</span>lang<span class="token punctuation">.</span></span>MyClass</span><span class="token annotation punctuation">@dd7123</span><span class="token punctuation">[</span><span class="token generics"><span class="token punctuation"><</span><span class="token keyword">null</span><span class="token punctuation">></span></span><span class="token punctuation">,</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token boolean">false</span><span class="token punctuation">]</span>
</code></pre></div><p>Explicitly giving names to the fields:</p> <div class="language-java extra-class"><pre class="language-java"><code><span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token class-name">String</span> <span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token class-name">ToStringBuilder</span> builder <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ToStringBuilder</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
builder<span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span><span class="token string">"field1"</span><span class="token punctuation">,</span>field1<span class="token punctuation">)</span><span class="token punctuation">;</span>
builder<span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span><span class="token string">"field2"</span><span class="token punctuation">,</span>field2<span class="token punctuation">)</span><span class="token punctuation">;</span>
builder<span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span><span class="token string">"field3"</span><span class="token punctuation">,</span>field3<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> builder<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><p>Example result:</p> <div class="language-java extra-class"><pre class="language-java"><code><span class="token class-name"><span class="token namespace">ar<span class="token punctuation">.</span>com<span class="token punctuation">.</span>jonat<span class="token punctuation">.</span>lang<span class="token punctuation">.</span></span>MyClass</span><span class="token annotation punctuation">@dd7404</span><span class="token punctuation">[</span>field1<span class="token operator">=</span><span class="token generics"><span class="token punctuation"><</span><span class="token keyword">null</span><span class="token punctuation">></span></span><span class="token punctuation">,</span>field2<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">,</span>field3<span class="token operator">=</span><span class="token boolean">false</span><span class="token punctuation">]</span>
</code></pre></div><p>You could change the style via parameter:</p> <div class="language-java extra-class"><pre class="language-java"><code><span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token class-name">String</span> <span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token class-name">ToStringBuilder</span> builder <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ToStringBuilder</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span>
<span class="token class-name">ToStringStyle</span><span class="token punctuation">.</span>MULTI_LINE_STYLE<span class="token punctuation">)</span><span class="token punctuation">;</span>
builder<span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span><span class="token string">"field1"</span><span class="token punctuation">,</span> field1<span class="token punctuation">)</span><span class="token punctuation">;</span>
builder<span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span><span class="token string">"field2"</span><span class="token punctuation">,</span> field2<span class="token punctuation">)</span><span class="token punctuation">;</span>
builder<span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span><span class="token string">"field3"</span><span class="token punctuation">,</span> field3<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> builder<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><p>Example result:</p> <div class="language-java extra-class"><pre class="language-java"><code><span class="token class-name"><span class="token namespace">ar<span class="token punctuation">.</span>com<span class="token punctuation">.</span>bna<span class="token punctuation">.</span>lang<span class="token punctuation">.</span></span>MyClass</span><span class="token annotation punctuation">@ebbf5c</span><span class="token punctuation">[</span>
field1<span class="token operator">=</span><span class="token generics"><span class="token punctuation"><</span><span class="token keyword">null</span><span class="token punctuation">></span></span>
field2<span class="token operator">=</span><span class="token number">0</span>
field3<span class="token operator">=</span><span class="token boolean">false</span>
<span class="token punctuation">]</span>
</code></pre></div><p>There are some styles, for example JSON, no Classname, short, etc ...</p> <p>Via reflection:</p> <div class="language-java extra-class"><pre class="language-java"><code><span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token class-name">String</span> <span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token class-name">ToStringBuilder</span><span class="token punctuation">.</span><span class="token function">reflectionToString</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><p>You could also indicate the style:</p> <div class="language-java extra-class"><pre class="language-java"><code><span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token class-name">String</span> <span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token class-name">ToStringBuilder</span><span class="token punctuation">.</span><span class="token function">reflectionToString</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> <span class="token class-name">ToStringStyle</span><span class="token punctuation">.</span>JSON_STYLE<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div></div> <footer class="page-edit"><div class="edit-link"><a href="https://github.com/devtut/generate/edit/master/docs/java/apache-commons-lang.md" target="_blank" rel="noopener noreferrer">Edit this page on GitHub</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <!----></footer> <div class="page-nav"><p class="inner"><span class="prev">
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