tester.java

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//*** Tester.java
class Top{
  public Top(){System.out.println("Top()");}
}
class Mid extends Top{
  public Mid(){System.out.println("Mid()");}
}
class Bot extends Mid{
  public Bot(){System.out.println("Bot()");}
}
public class Tester{
  public static void main(String args[]){
    new Bot();
  }
}