Different ways of retrieving values from a JavaMap

Different ways of retrieving values from a JavaMap

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

import java.util.Map.Entry;

import java.util.Set;

public class MapSample {

public static void main(String[] args){

Map<Integer,String> hp = new HashMap<Integer,String>();

hp.put(1001, "BALA");

hp.put(1002, "Gopi");

hp.put(1002, "Gopis");

hp.put(1003, "Shiva");

hp.put(1004, "Nambuthiri");

hp.put(1005, "MaxOut");

hp.put(1007, "MaxIn");

hp.put(1009, "Jev");

hp.put(1017, "BALA");

System.out.println();

System.out.println("+++++++++++++++++Using entrySet");

Set<Entry<Integer,String>> entrySet = hp.entrySet();

for(Entry entry : entrySet){

System.out.print( entry.getKey()+":"+entry.getValue()+",");

}

System.out.println();

System.out.println("+++++++++++++++++Using Iterator");

Iterator<Entry<Integer,String>> it = hp.entrySet().iterator();

while(it.hasNext()){

System.out.print(it.next());

System.out.print(",");

}

System.out.println();

System.out.println("+++++++++++++++++Using map.values");

for(String str : hp.values()){

System.out.print(str+",");

}

System.out.println();

System.out.println("+++++++++++++++++Using map.keySets");

for(Integer str : hp.keySet()){

System.out.print(str+",");

}

}

}