maryland-maryland.html

来自「经典的数据结构源代码（java 实现）」· HTML 代码 · 共 45 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>Maryland <font color=#8000a0><font color=#ff8000>extends</font> </font>State {  <font color=#0000ff>Maryland</font>() { <font color = #ff0080>/* null constructor */</font> }  <font color=#8000a0><font color=#8000a0>public</font> </font><font color=#8000a0>void</font> <font color=#0000ff>printMe</font>() { System.out.<font color=#0000ff>println</font>(<font color=#008000>"Read it."</font>); }  <font color=#8000a0><font color=#8000a0>public</font> </font><font color=#8000a0>static</font> <font color=#8000a0><font color=#8000a0>void</font> </font><font color=#0000ff>main</font>(<font color=#8000a0>String</font>[] args) {    <font color=#8000a0>Region </font>mid = <font color=#8000a0><font color=#ff8000>new</font> </font><font color=#0000ff>State</font>();    <font color=#8000a0>State </font>md = <font color=#8000a0><font color=#ff8000>new</font> </font><font color=#0000ff>Maryland</font>();    <font color=#8000a0>Object </font>obj = <font color=#8000a0><font color=#ff8000>new</font> </font><font color=#0000ff>Place</font>();    <font color=#8000a0>Place </font>usa = <font color=#8000a0><font color=#ff8000>new</font> </font><font color=#0000ff>Region</font>();    md.<font color=#0000ff>printMe</font>();    mid.<font color=#0000ff>printMe</font>();<font color=#0000ff>    </font>(<font color=#0000ff></font>(Place) obj).<font color=#0000ff>printMe</font>();    obj = md;<font color=#0000ff>    </font>(<font color=#0000ff></font>(Maryland) obj).<font color=#0000ff>printMe</font>();    obj = usa;<font color=#0000ff>    </font>(<font color=#0000ff></font>(Place) obj).<font color=#0000ff>printMe</font>();    usa = md;<font color=#0000ff>    </font>(<font color=#0000ff></font>(Place) usa).<font color=#0000ff>printMe</font>();  }}<font color=#ff8000>class</font> <font color=#8000a0>State  </font><font color=#ff8000>extends</font> Region {  <font color=#0000ff>State</font>() { <font color = #ff0080>/* null constructor */</font> }  <font color=#8000a0><font color=#8000a0>public</font> </font><font color=#8000a0>void</font> <font color=#0000ff>printMe</font>() { System.out.<font color=#0000ff>println</font>(<font color=#008000>"Ship it."</font>); }}<font color=#ff8000>class</font> <font color=#8000a0>Region </font><font color=#ff8000>extends</font> Place {  <font color=#0000ff>Region</font>() { <font color = #ff0080>/* null constructor */</font> }  <font color=#8000a0><font color=#8000a0>public</font> </font><font color=#8000a0>void</font> <font color=#0000ff>printMe</font>() { System.out.<font color=#0000ff>println</font>(<font color=#008000>"Box it."</font>); }}<font color=#ff8000>class</font> <font color=#8000a0>Place </font><font color=#ff8000>extends</font> Object {  <font color=#0000ff>Place</font>() { <font color = #ff0080>/* null constructor */</font> }  <font color=#8000a0><font color=#8000a0>public</font> </font><font color=#8000a0>void</font> <font color=#0000ff>printMe</font>() { System.out.<font color=#0000ff>println</font>(<font color=#008000>"Buy it."</font>); }}</dl></body></html>

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