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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...{} 
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        A a1 = new A();
        A a2 = new B();
        B b = new B();


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import java.util.*;
public class bycomma{
 public static String[] splitStringByComma(String source){
   if(source==null||source.trim().equals(""))
    ......

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package com.softeem.demo;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
/**
*@authorleno
*µ¥×Óģʽ£¬±£Ö¤ÔÚÕû¸öÓ¦ÓÃÆÚ¼äÖ»¼ÓÔØÒ ......

[vb]ʹÓÃvbͳ¼Æ.javaµÄÐÐÊý

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    Set srcIn = fso.OpenTextFile(fileNm, ForReading)
    
    Do While Not srcIn.AtEndOfStream
        buf = srcIn.ReadLine
 &nbs ......

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import java.awt.Color;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionAdapter;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
......
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