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Java Collection, HashMap Exercises: Get a collection view of the values contained in this map

Java Collection, HashMap Exercises: Exercise-12 with Solution

Write a Java program to get a collection view of the values contained in this map.

Sample Solution:-

Java Code:

import java.util.*;  
public class Example12 {  
     public static void main(String args[]){  
 
  HashMap<Integer,String> hash_map= new HashMap<Integer,String>();  
    hash_map.put(1,"Red");
  hash_map.put(2,"Green");
  hash_map.put(3,"Black");
  hash_map.put(4,"White");
  hash_map.put(5,"Blue");
       
   // checking collection view of the map
   System.out.println("Collection view is: "+ hash_map.values());
 }
}

Sample Output:

Collection view is: [Red, Green, Black, White, Blue]

Java Code Editor:

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Java: Tips of the Day

getEnumMap

Converts to enum to Map where key is the name and value is Enum itself.

public static <E extends Enum<E>> Map<String, E> getEnumMap(final Class<E> enumClass) {
    return Arrays.stream(enumClass.getEnumConstants())
            .collect(Collectors.toMap(Enum::name, Function.identity()));
}

Ref: https://bit.ly/3xXcFZt