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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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package com.softeem.demo;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.net.ServerSocket;
import java.net.Socket;
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/******************TestThread.java begin****************************/ 
public class TestThread {
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  Object obj=new Object();
  
  print p=new print(obj);
   ......
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