Compute If Absent metod

package POMOS;

import java.util.HashMap;

public class HashMapPomos {
    public static void main(String[] args) {
        HashMap<Integer,String> map=new HashMap<>();
        map.put(10,"Ivana");
        map.put(20,"Ivona");
        map.put(30,"Angela");

        //System.out.println("HashMap:\n"+map.toString());


        //provide value for new key which is absent with computeIfAbsent
        map.computeIfAbsent(40,value->"Sandra");

        //this will not affect anything because key 10 is present
        map.computeIfAbsent(10, value->"Ivana");

        //System.out.println("New HashMap:\n" +map.toString());

        HashMap<String,Integer> prices=new HashMap<>();
        prices.put("Shoes",200);
        prices.put("Bag",100);
        prices.put("Pants",300);

        System.out.println("Prices"+ prices.toString());
        System.out.println();

        //compute if absent value of shirt
        prices.computeIfAbsent("Shirt",value->500);

        System.out.println("New prices"+prices.toString());
        System.out.println();

    }
}