If i don't use generics then why do i need to convert it into generics ?

Question

Set set=map.entrySet();

Answer 1

Sorry, I don't understand your question. What do you want to do?

Answer 2

Set is a generic interface so if you use Set you use generic.

Answer 3

Yes, a generic interface so every implementation is a generic class. Sorry for the mistake, I fixed it ;)

Answer 4

You can:

https://code.sololearn.com/cpY85ql77YLX/?ref=app

But as Set is Iterable, it is better to use in enhanced for than use Iterator

Answer 5

/Non-generic
import java.util.*;
public class MapExample1 {
public static void main(String[] args) {
Map map=new HashMap();
//Adding elements to map
map.put(1,"Amit");
map.put(5,"Rahul");
map.put(2,"Jai");
map.put(6,"Amit");
//Traversing Map
Set set=map.entrySet();//Converting to Set so that we can traverse
Iterator itr=set.iterator();
while(itr.hasNext()){
//Converting to Map.Entry so that we can get key and value separately
Map.Entry entry=(Map.Entry)itr.next();
System.out.println(entry.getKey()+" "+entry.getValue());
}
}
}

Answer 6

set is a interface

Answer 7

public interface Set<E> extends Collection<E>

Answer 8

if we use generics then we don't need this line

Answer 9

what is generic interface ?

Answer 10

why we can't write ..Iterator i=map.entryset().iterator()