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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 a2 = new B();
B b = new B();
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import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
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