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style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>项目。</span></p>
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<p class=MsoNormal><span lang=EN-US><span style='mso-tab-count:1'> </span></span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>项目取名</span><span lang=EN-US>EMMA</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>选上创建单独的原文件夹和输出文件夹。</span></p>
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<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>选择下一步，在第一个选项</span> <span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>源</span> <span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>里点击新建文件夹。</span></p>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>依次新建</span><span lang=EN-US>doc</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>，</span><span lang=EN-US>report</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>，</span><span lang=EN-US>lib</span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>文件夹。再选上所有的文件夹（这里图中忘记选择</span><span
lang=EN-US>bin</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>文件夹了。因此下面的工程目录里看不到</span><span
lang=EN-US>bin</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>文件夹，不过其实该文件夹是存在的）。</span></p>
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<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>没有选择</span><span lang=EN-US>bin</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>文件夹的工程目录是这样的。</span></p>
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<p class=MsoNormal><span lang=EN-US><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>3</span><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>．现在让我没开始建</span><span
lang=EN-US>junit</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>的测试对象类，这里以稍微复杂的的</span><span
lang=EN-US>Stack</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>类为例。</span></p>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>选重</span><span lang=EN-US>src</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>文件夹右击，选择新建</span><span lang=EN-US>class</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>。把包名添上</span><span lang=EN-US>util</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>，类名为</span><span lang=EN-US>Stack</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>。如下图。其他不变。</span></p>
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<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>编写好的</span><span lang=EN-US>Stack</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>代码如下。</span></p>
<p class=MsoNormal><span lang=EN-US>package util;</span></p>
<p class=MsoNormal><span lang=EN-US>import java.util.*;</span></p>
<p class=MsoNormal><span lang=EN-US><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>/**</span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>* The <code>Stack2</code> class represents a
last-in-first-out </span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>* (LIFO) stack of objects. It extends class
<tt>Vector</tt> with five </span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>* operations that allow a vector to be treated as a stack.
The usual </span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>* <tt>push</tt> and <tt>pop</tt>
operations are provided, as well as a</span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>* method to <tt>peek</tt> at the top item on the
stack, a method to test </span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>* for whether the stack is <tt>empty</tt>, and a
method to <tt>search</tt> </span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>* the stack for an item and discover how far it is from the
top.</span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>* <p></span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>* When a stack is first created, it contains no items. </span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>*/</span></p>
<p class=MsoNormal><span lang=EN-US>public class Stack extends Vector {</span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>/**</span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>* Creates an empty Stack2.</span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>*/</span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>public Stack() {</span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>}</span></p>
<p class=MsoNormal><span lang=EN-US><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>/**</span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>* Pushes an item onto the top of this
stack. This has exactly </span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>* the same effect as:</span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>* <blockquote><pre></span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>*
addElement(item)</pre></blockquote></span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>*</span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>* @param<span style="mso-spacerun:
yes"> </span>item<span style="mso-spacerun: yes">
</span>the item to be pushed onto this stack.</span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>* @return<span style="mso-spacerun:
yes"> </span>the <code>item</code> argument.</span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>* @see<span style="mso-spacerun:
yes"> </span>java.util.Vector#addElement</span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>*/</span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span><span style="mso-spacerun: yes"> </span>public
Object push(Object item) {</span></p>
<p class=MsoNormal><span lang=EN-US><span style='mso-tab-count:1'> </span>addElement(item);</span></p>
<p class=MsoNormal><span lang=EN-US><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><span style='mso-tab-count:1'> </span>return
item;</span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>}</span></p>
<p class=MsoNormal><span lang=EN-US><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>/**</span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>* Removes the object at the top of this
stack and returns that </span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>* object as the value of this function. </span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>*</span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>* @return<span style="mso-spacerun:
yes"> </span>The object at the top of this stack (the
last item </span></p>
<p class=MsoNormal><span lang=EN-US><span style="mso-spacerun:
yes"> </span>*<span style="mso-spacerun:
yes">
</span>of the <tt>Vector</tt> object).</span></p>
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