elementiterator-iterator.html

来自「经典的数据结构源代码(java 实现)」· HTML 代码 · 共 30 行

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<html><head><title>Code Fragment</title></head><body text=#000000><center></center><br><br><dl><dd><pre><font color=#8000a0>public</font> <font color=#8000a0><font color=#ff8000>class</font> </font>ElementIterator&lt;E&gt; <font color=#8000a0><font color=#ff8000>implements</font> </font>Iterator&lt;E&gt; {  <font color=#8000a0><font color=#8000a0>protected</font> </font>PositionList&lt;E&gt; list; <font color=#ff0080>// the underlying list</font>  <font color=#8000a0><font color=#8000a0>protected</font> </font>Position&lt;E&gt; cursor; <font color=#ff0080>// the next position</font>  <font color = #ff0080>/** Creates an element iterator over the given list. */</font>  <font color=#8000a0><font color=#8000a0>public</font> </font><font color=#0000ff>ElementIterator</font>(PositionList&lt;E&gt; L) {    list = L;    cursor =<font color=#0000ff> </font>(list.<font color=#0000ff>isEmpty</font>())? null : list.<font color=#0000ff>first</font>();  }  <font color=#8000a0><font color=#8000a0>public</font> </font><font color=#8000a0>boolean</font> <font color=#0000ff>hasNext</font>() { <font color=#ff8000>return</font><font color=#0000ff> </font>(cursor != null);  }  <font color=#8000a0><font color=#8000a0>public</font> </font>E <font color=#0000ff>next</font>() <font color=#8000a0><font color=#ff8000>throws</font> </font>NoSuchElementException {    <font color=#ff8000>if</font><font color=#0000ff> </font>(cursor == null)      <font color=#8000a0><font color=#ff8000>throw</font> </font><font color=#ff8000>new</font> <font color=#0000ff>NoSuchElementException</font>(<font color=#008000>"No next element"</font>);    <font color=#8000a0>E </font>toReturn = cursor.<font color=#0000ff>element</font>();    cursor =<font color=#0000ff> </font>(cursor == list.<font color=#0000ff>last</font>())? null : list.<font color=#0000ff>next</font>(cursor);    <font color=#8000a0><font color=#ff8000>return</font> </font>toReturn;  }}</dl></body></html>

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