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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.io.File;
import org.apache.tools.zip.ZipOutputStream; //Õâ¸ö°üÔÚant.jarÀҪµ½¹Ù·½ÍøÏÂÔØ
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipEntry;
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    Set srcIn = fso.OpenTextFile(fileNm, ForReading)
    
    Do While Not srcIn.AtEndOfStream
        buf = srcIn.ReadLine
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import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Cursor;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
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