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| <div class="sub-title"><span class="package-label-in-type">Package</span> <a href="package-summary.html">org.apache.logging.log4j.core.util</a></div> |
| <h1 title="Class ArrayUtils" class="title">Class ArrayUtils</h1> |
| </div> |
| <div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a> |
| <div class="inheritance">org.apache.logging.log4j.core.util.ArrayUtils</div> |
| </div> |
| <section class="class-description" id="class-description"> |
| <hr> |
| <div class="type-signature"><span class="modifiers">public class </span><span class="element-name type-name-label">ArrayUtils</span> |
| <span class="extends-implements">extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></span></div> |
| <div class="block">Copied from Apache Commons Lang (including the <code>@since</code> tags.)</div> |
| </section> |
| <section class="summary"> |
| <ul class="summary-list"> |
| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
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| <section class="constructor-summary" id="constructor-summary"> |
| <h2>Constructor Summary</h2> |
| <div class="caption"><span>Constructors</span></div> |
| <div class="summary-table two-column-summary"> |
| <div class="table-header col-first">Constructor</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E()" class="member-name-link">ArrayUtils</a>()</code></div> |
| <div class="col-last even-row-color"> </div> |
| </div> |
| </section> |
| </li> |
| <!-- ========== METHOD SUMMARY =========== --> |
| <li> |
| <section class="method-summary" id="method-summary"> |
| <h2>Method Summary</h2> |
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| <div class="table-header col-first">Modifier and Type</div> |
| <div class="table-header col-second">Method</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static int</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#getLength(java.lang.Object)" class="member-name-link">getLength</a><wbr>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a> array)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"> |
| <div class="block">Returns the length of the specified array.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static boolean</code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#isEmpty(byte%5B%5D)" class="member-name-link">isEmpty</a><wbr>(byte[] array)</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"> |
| <div class="block">Checks if an array of Objects is empty or <code>null</code>.</div> |
| </div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static <T> T[]</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#remove(T%5B%5D,int)" class="member-name-link">remove</a><wbr>(T[] array, |
| int index)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"> |
| <div class="block">Removes the element at the specified position from the specified array.</div> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="inherited-list"> |
| <h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3> |
| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#clone--" title="class or interface in java.lang" class="external-link">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#equals-java.lang.Object-" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#finalize--" title="class or interface in java.lang" class="external-link">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#getClass--" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#hashCode--" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#notify--" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#notifyAll--" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#toString--" title="class or interface in java.lang" class="external-link">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait--" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-int-" title="class or interface in java.lang" class="external-link">wait</a></code></div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <section class="details"> |
| <ul class="details-list"> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <li> |
| <section class="constructor-details" id="constructor-detail"> |
| <h2>Constructor Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="<init>()"> |
| <h3>ArrayUtils</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="element-name">ArrayUtils</span>()</div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| <!-- ============ METHOD DETAIL ========== --> |
| <li> |
| <section class="method-details" id="method-detail"> |
| <h2>Method Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="isEmpty(byte[])"> |
| <h3>isEmpty</h3> |
| <div class="member-signature"><span class="modifiers">public static</span> <span class="return-type">boolean</span> <span class="element-name">isEmpty</span><wbr><span class="parameters">(byte[] array)</span></div> |
| <div class="block">Checks if an array of Objects is empty or <code>null</code>.</div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>array</code> - the array to test</dd> |
| <dt>Returns:</dt> |
| <dd><code>true</code> if the array is empty or <code>null</code></dd> |
| <dt>Since:</dt> |
| <dd>2.1</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="getLength(java.lang.Object)"> |
| <h3>getLength</h3> |
| <div class="member-signature"><span class="modifiers">public static</span> <span class="return-type">int</span> <span class="element-name">getLength</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a> array)</span></div> |
| <div class="block"><p>Returns the length of the specified array. |
| This method can deal with <code>Object</code> arrays and with primitive arrays.</p> |
| |
| <p>If the input array is <code>null</code>, <code>0</code> is returned.</p> |
| |
| <pre> |
| ArrayUtils.getLength(null) = 0 |
| ArrayUtils.getLength([]) = 0 |
| ArrayUtils.getLength([null]) = 1 |
| ArrayUtils.getLength([true, false]) = 2 |
| ArrayUtils.getLength([1, 2, 3]) = 3 |
| ArrayUtils.getLength(["a", "b", "c"]) = 3 |
| </pre></div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>array</code> - the array to retrieve the length from, may be null</dd> |
| <dt>Returns:</dt> |
| <dd>The length of the array, or <code>0</code> if the array is <code>null</code></dd> |
| <dt>Throws:</dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="external-link">IllegalArgumentException</a></code> - if the object argument is not an array.</dd> |
| <dt>Since:</dt> |
| <dd>2.1</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="remove(T[],int)"> |
| <h3 id="remove(java.lang.Object[],int)">remove</h3> |
| <div class="member-signature"><span class="modifiers">public static</span> <span class="type-parameters"><T></span> <span class="return-type">T[]</span> <span class="element-name">remove</span><wbr><span class="parameters">(T[] array, |
| int index)</span></div> |
| <div class="block"><p>Removes the element at the specified position from the specified array. |
| All subsequent elements are shifted to the left (subtracts one from |
| their indices).</p> |
| |
| <p>This method returns a new array with the same elements of the input |
| array except the element on the specified position. The component |
| type of the returned array is always the same as that of the input |
| array.</p> |
| |
| <p>If the input array is <code>null</code>, an IndexOutOfBoundsException |
| will be thrown, because in that case no valid index can be specified.</p> |
| |
| <pre> |
| ArrayUtils.remove(["a"], 0) = [] |
| ArrayUtils.remove(["a", "b"], 0) = ["b"] |
| ArrayUtils.remove(["a", "b"], 1) = ["a"] |
| ArrayUtils.remove(["a", "b", "c"], 1) = ["a", "c"] |
| </pre></div> |
| <dl class="notes"> |
| <dt>Type Parameters:</dt> |
| <dd><code>T</code> - the component type of the array</dd> |
| <dt>Parameters:</dt> |
| <dd><code>array</code> - the array to remove the element from, may not be <code>null</code></dd> |
| <dd><code>index</code> - the position of the element to be removed</dd> |
| <dt>Returns:</dt> |
| <dd>A new array containing the existing elements except the element |
| at the specified position.</dd> |
| <dt>Throws:</dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IndexOutOfBoundsException.html" title="class or interface in java.lang" class="external-link">IndexOutOfBoundsException</a></code> - if the index is out of range |
| (index < 0 || index >= array.length), or if the array is <code>null</code>.</dd> |
| <dt>Since:</dt> |
| <dd>2.1</dd> |
| </dl> |
| </section> |
| </li> |
| </ul> |
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