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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Next: Get a set view of the keys contained in this map.
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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
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