java ¶à̬(2)
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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();
&nbs
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/**
* ÓйØÈÕÆÚ¹¤¾ßÀà(extends TimeUtil)
*
* TimeUtilÖ÷Òª¹¦ÄÜÓУº
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*
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