import java.util.*;

/**

* hashmapput

*/

public class hashmapput {

public static void main(String[] args) {

//Create an empty hash map by declaring object

// of string and integer type....

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

// adding elements to the Map

mp.put("Ram", 100);

mp.put("Krishna", 150);

System.out.println();

System.out.println("After Adding Elements");

System.out.println();

//Printing element

System.out.println(mp.get("Ram"));

System.out.println(mp.get("Krishna"));

System.out.println();

//Printing all the element in the Hashmap using for each loop...

for (Map.Entry m : mp.entrySet())

System.out.println("Key: " +m.getKey()+" Value:"+m.getValue());

int key=15;//We are searching this Key in our Hasmap..

if(mp.containsKey(key))

{

Integer val=(Integer) mp.get(key);

System.out.println("\nValue Corresponding to the given Key is "+val);

}

else{ System.out.println("The Given Key does not Exist!");}

//Putting a New value against existing Key

mp.put("Krishna",200);

System.out.println("\n\nAfter Updating Value Against Same Key");

for (Map.Entry m : mp.entrySet())

System.out.println("Key: " +m.getKey()+" Value:"+m.getValue());

//Removing the pair whose Key is Krishna

mp.remove("Krishna");

System.out.println("\n\nAfter Removing One Pair from the Hashmap");

for (Map.Entry m1 : mp.entrySet())

System.out.println("Key: " +m1.getKey()+" Value:"+m1.getValue());

//using of ifabsent it will add the entries only if the enteries is not added or not found.

mp.putIfAbsent("Balram",300);

mp.putIfAbsent("Balram",400);

System.out.println("\n\nUsing putifAbsent Method");

for (Map.Entry m2 : mp.entrySet()) //m2 is a variable (use as itrater )

System.out.println("Key: " +m2.getKey()+" Value:"

+"\""+m2.getValue()+"\"");

}

}