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Ô­ÎÄ£ºhttp://blog.csdn.net/thinkghoster/archive/2008/04/19/2307001.aspx
class
 A
...
{
         
public
 String show(D obj)
...
{
                
return
 (
"
A and D
"
);
         }
 
         
public
 String show(A obj)
...
{
                
return
 (
"
A and A
"
);
         }
 
}
 
class
 B 
extends
 A
...
{
         
public
 String show(B obj)
...
{
                
return
 (
"
B and B
"
);
         }
         
public
 String show(A obj)
...
{
                
return
 (
"
B and A
"
);
         }
 
}
class
 C 
extends
 B
...
{}
 
class
 D 
extends
 B
...
{}
A a1 
=
 
new
 A();
        A a2 
=
 
new
 B();
        B b =
new
 B();
        C c 
=
 
new
 C(); 
        D d 
=
 
new
 D(); 
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