polytest.java

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class Emp{
  public void hi(){System.out.println("Hi,Emp!");}
}
class Temp extends Emp{
  public void hi(){System.out.println("Hi,Temp!");}
}
class Mang extends Emp{
  public void hi(){System.out.println("Hi,Mang!");}
}
class CorpOff extends Mang{
  public void hi(){System.out.println("Hi,CorpOff!");}
}

class PloyTest{
  public static void main(String args[])
  {
    Emp t;
    
    t = new Emp();
    t.hi();
    t = new Temp();
    t.hi();
    t = new Mang();
    t.hi();
    t = new CorpOff();
    t.hi();
  }
}