Question

April 22, 2019 at 00:23 Submit a java program that utilizes Hash Maps. Write three functions for your program. Pass a String to the first function to Add a Color to the Hashmap Pass the Key to the second function to check if a certain Key is present in the Hashmap. Your function should output whether the key is present or not. Pass a Color String to the third function to check if a certain Color is present in the Hashmap. You function should output whether the color is present or not y na

Answer 1

//######################### PGM START ###################################

import java.util.HashMap;

public class HashMapImplementation {
   //hash map with integer key and string value
   private static HashMap<Integer,String> colorMap = new HashMap<>();
   private static int key=1;
  
   //function to add color to hash map
   public static void addColor(String c) {
       colorMap.put(key,c);
       System.out.println("Added ("+key+","+c+") to hash map");
       key++;
   }
  
   //function to check if a key is present in hash map
   public static void checkKey(int n) {
       if(colorMap.containsKey(n)) {
           System.out.println("Key "+n+" is present");
       }else {
           System.out.println("Key "+n+" is not present");
       }
   }
   //function to check if a color is present in hash map
   public static void checkColor(String c) {
       if(colorMap.containsValue(c)) {
           System.out.println("Color "+c+" is present");
       }else {
           System.out.println("Color "+c+" is not present");
       }
   }
  
   //main function
   public static void main(String[] args) {
      
       //adding colors to hash map
       addColor("orange");
       addColor("black");
       addColor("white");
       addColor("blue");
      
       //checking a key is in hash map
       checkKey(2);
       checkKey(5);
      
       //checking a color is in hash map
       checkColor("blue");
       checkColor("purple");
   }

}

//##################################### PGM END ################################

OUTPUT
#########

Added (1,orange) to hash map Added (2,black) to hash map Added (3,white) to hash map Added (4,blue) to hash map Key 2 is present Key 5 is not present Color blue is present Color purple is not present