What's wrong with the following program (if any)?

a.Nothing is wrong with the program


b.Adding similar key values to a Hashmap results in an exception


c.The constructor method PMs() is wrong


d.The size() method is wrong





import java.util.*;


public class PMs {


private Map m = new HashMap();


public void PMs() {


m.put("Nehru", "Jawaharlal");


m.put("Nanda", "Gulzarilal");


m.put("Shastri", "Lal Bahadur");


m.put("Gandhi", "Indira");


m.put("Desai", "Morarji");


m.put("Singh", "Charan");


m.put("Gandhi", "Rajiv");


m.put("Singh", "Vishwanath Pratap");


m.put("Shekhar", "Chandra");


m.put("Rao", "Narasimha");


m.put("Vajpayee", "Atal Behari");


m.put("Gowda", "Deve");


m.put("Gujaral", "Inder Kumar");


m.put("Singh", "Manmohan");


}


public int size() { return m.size(); }


public static void main(String args[]) {


PMs primeministers = new PMs();


System.out.println("Prime ministers with different last name = " + primeministers.size());


}


}

What's wrong with the following program (if any)?
Hi program will compile


o/p


Prime ministers with different last name = 0





i find your logic wrong at





public int size() { return m.size(); }


public static void main(String args[]) {


PMs primeministers = new PMs();


System.out.println("Prime ministers with different last name = " + primeministers.size());


}





instead of doing this you can use something like





import java.util.*;


import java.util.HashMap;


public class PMs {





public static void main(String args[]) {


Map m = new HashMap();








m.put("Nehru", "Jawaharlal");


m.put("Nanda", "Gulzarilal");


m.put("Shastri", "Lal Bahadur");


m.put("Gandhi", "Indira");


m.put("Desai", "Morarji");


m.put("Singh", "Charan");


m.put("Gandhi", "Rajiv");


m.put("Singh", "Vishwanath Pratap");


m.put("Shekhar", "Chandra");


m.put("Rao", "Narasimha");


m.put("Vajpayee", "Atal Behari");


m.put("Gowda", "Deve");


m.put("Gujaral", "Inder Kumar");


m.put("Singh", "Manmohan");





Iterator it = m.keySet().iterator();


while (it.hasNext()) {


System.out.println("Prime ministers with different last name =" + it.next());


}


}


}





hope this helps


Cheers:)
Reply:why dont you learn java and answer it yourself
Reply:all this greek to me