tsld041.htm

来自「an excellent java tutorial for the ones 」· HTM 代码 · 共 59 行

HTM
59 行
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<HTML>

<HEAD>
<META HTTP-EQUIV="Context-Type" CONTEXT="text/html;charset=windows-1252">
<meta name="GENERATOR" content="Microsoft Internet Assistant for PowerPoint 97">
 <TITLE>Abstract</TITLE> 
</HEAD>

<BODY     >

 <H1>Abstract</H1> 
 <P><UL>
- Classes 
<BR><UL>
<LI> can抰 be instantiated
</UL></UL><UL>
- Methods 
<UL>
<LI> can抰 have any implementation
<LI> need implementation from their children</UL></UL></P>
<P><UL>
abstract class Shape {
<BR></UL><UL>
     protected int edges_num;	
</UL><UL>
     abstract void draw();	
</UL><UL>
}
</UL><UL>

</UL><UL>
class Star extends Shape{
</UL><UL>
	Star(int _edges) {
</UL><UL>
	edges_num = _edges;
</UL><UL>
	}
</UL><UL>
	public void draw() {}
</UL><UL>
}</UL></P>
<P></P> 
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