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<div class="subTitle">org.apache.axis2.util</div>
<h2 title="Class ArrayStack" class="title">Class ArrayStack</h2>
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<pre>public class <span class="strong">ArrayStack</span>
extends <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/ArrayList.html?is-external=true" title="class or interface in java.util">ArrayList</a></pre>
<div class="block">An implementation of the <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Stack.html?is-external=true" title="class or interface in java.util"><code>Stack</code></a> API that is based on an <code>ArrayList</code>
instead of a <code>Vector</code>, so it is not synchronized to protect against multi-threaded
access. The implementation is therefore operates faster in environments where you do not need to
worry about multiple thread contention.
<p/>
The removal order of an <code>ArrayStack</code> is based on insertion order: The most recently
added element is removed first. The iteration order is <i>not</i> the same as the removal order.
The iterator returns elements from the bottom up, whereas the <a href="../../../../org/apache/axis2/util/ArrayStack.html#remove()"><code>remove()</code></a> method removes
them from the top down.
<p/>
Unlike <code>Stack</code>, <code>ArrayStack</code> accepts null entries.</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../serialized-form.html#org.apache.axis2.util.ArrayStack">Serialized Form</a></dd></dl>
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<td class="colOne"><code><strong><a href="../../../../org/apache/axis2/util/ArrayStack.html#ArrayStack()">ArrayStack</a></strong>()</code>
<div class="block">Constructs a new empty <code>ArrayStack</code>.</div>
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<td class="colOne"><code><strong><a href="../../../../org/apache/axis2/util/ArrayStack.html#ArrayStack(int)">ArrayStack</a></strong>(int&nbsp;initialSize)</code>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/axis2/util/ArrayStack.html#empty()">empty</a></strong>()</code>
<div class="block">Return <code>true</code> if this stack is currently empty.</div>
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<td class="colFirst"><code><a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/axis2/util/ArrayStack.html#get()">get</a></strong>()</code>
<div class="block">Returns the element on the top of the stack.</div>
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<tr class="altColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/axis2/util/ArrayStack.html#peek()">peek</a></strong>()</code>
<div class="block">Returns the top item off of this stack without removing it.</div>
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<tr class="rowColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/axis2/util/ArrayStack.html#peek(int)">peek</a></strong>(int&nbsp;n)</code>
<div class="block">Returns the n'th item down (zero-relative) from the top of this stack without removing it.</div>
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<td class="colFirst"><code><a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/axis2/util/ArrayStack.html#pop()">pop</a></strong>()</code>
<div class="block">Pops the top item off of this stack and return it.</div>
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<td class="colFirst"><code><a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/axis2/util/ArrayStack.html#push(java.lang.Object)">push</a></strong>(<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;item)</code>
<div class="block">Pushes a new item onto the top of this stack.</div>
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<tr class="altColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/axis2/util/ArrayStack.html#remove()">remove</a></strong>()</code>
<div class="block">Removes the element on the top of the stack.</div>
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<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/axis2/util/ArrayStack.html#search(java.lang.Object)">search</a></strong>(<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;object)</code>
<div class="block">Returns the one-based position of the distance from the top that the specified object exists
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<h4>ArrayStack</h4>
<pre>public&nbsp;ArrayStack()</pre>
<div class="block">Constructs a new empty <code>ArrayStack</code>. The initial size is controlled by
<code>ArrayList</code> and is currently 10.</div>
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<h4>ArrayStack</h4>
<pre>public&nbsp;ArrayStack(int&nbsp;initialSize)</pre>
<div class="block">Constructs a new empty <code>ArrayStack</code> with an initial size.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>initialSize</code> - the initial size to use</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - if the specified initial size is negative</dd></dl>
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<pre>public&nbsp;boolean&nbsp;empty()</pre>
<div class="block">Return <code>true</code> if this stack is currently empty.
<p/>
This method exists for compatibility with <code>java.util.Stack</code>. New users of this
class should use <code>isEmpty</code> instead.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>true if the stack is currently empty</dd></dl>
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<h4>peek</h4>
<pre>public&nbsp;<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;peek()
throws <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/EmptyStackException.html?is-external=true" title="class or interface in java.util">EmptyStackException</a></pre>
<div class="block">Returns the top item off of this stack without removing it.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the top item on the stack</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/EmptyStackException.html?is-external=true" title="class or interface in java.util">EmptyStackException</a></code> - if the stack is empty</dd></dl>
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<pre>public&nbsp;<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;peek(int&nbsp;n)
throws <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/EmptyStackException.html?is-external=true" title="class or interface in java.util">EmptyStackException</a></pre>
<div class="block">Returns the n'th item down (zero-relative) from the top of this stack without removing it.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>n</code> - the number of items down to go</dd>
<dt><span class="strong">Returns:</span></dt><dd>the n'th item on the stack, zero relative</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/EmptyStackException.html?is-external=true" title="class or interface in java.util">EmptyStackException</a></code> - if there are not enough items on the stack to satisfy this
request</dd></dl>
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<h4>pop</h4>
<pre>public&nbsp;<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;pop()
throws <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/EmptyStackException.html?is-external=true" title="class or interface in java.util">EmptyStackException</a></pre>
<div class="block">Pops the top item off of this stack and return it.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the top item on the stack</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/EmptyStackException.html?is-external=true" title="class or interface in java.util">EmptyStackException</a></code> - if the stack is empty</dd></dl>
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<h4>push</h4>
<pre>public&nbsp;<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;push(<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;item)</pre>
<div class="block">Pushes a new item onto the top of this stack. The pushed item is also returned. This is
equivalent to calling <code>add</code>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>item</code> - the item to be added</dd>
<dt><span class="strong">Returns:</span></dt><dd>the item just pushed</dd></dl>
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<pre>public&nbsp;int&nbsp;search(<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;object)</pre>
<div class="block">Returns the one-based position of the distance from the top that the specified object exists
on this stack, where the top-most element is considered to be at distance <code>1</code>. If
the object is not present on the stack, return <code>-1</code> instead. The
<code>equals()</code> method is used to compare to the items in this stack.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>object</code> - the object to be searched for</dd>
<dt><span class="strong">Returns:</span></dt><dd>the 1-based depth into the stack of the object, or -1 if not found</dd></dl>
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<h4>get</h4>
<pre>public&nbsp;<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;get()</pre>
<div class="block">Returns the element on the top of the stack.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the element on the top of the stack</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/EmptyStackException.html?is-external=true" title="class or interface in java.util">EmptyStackException</a></code> - if the stack is empty</dd></dl>
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<h4>remove</h4>
<pre>public&nbsp;<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;remove()</pre>
<div class="block">Removes the element on the top of the stack.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the removed element</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/EmptyStackException.html?is-external=true" title="class or interface in java.util">EmptyStackException</a></code> - if the stack is empty</dd></dl>
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