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Java Collection, HashMap Exercises: Get the value of a specified key in a map

Java Collection, HashMap Exercises: Exercise-10 with Solution

Write a Java program to get the value of a specified key in a map.

Sample Solution:-

Java Code:

import java.util.*;  
public class Example10 {  
    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");
     // get value of key 3
   String val=(String)hash_map.get(3); 
   // check the value
   System.out.println("Value for key 3 is: " + val);
 }
}

Sample Output:

Value for key 3 is: Black

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