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Java Collection, TreeMap Exercises: Search a key in a Tree Map

Java Collection, TreeMap Exercises: Exercise-3 with Solution

Write a Java program to search a key in a Tree Map.

Sample Solution:-

Java Code:

import java.util.*;  
public class Example3 {  
   public static void main(String args[]){  
  
  // Create a tree map
   TreeMap<String,String> tree_map1=new TreeMap<String,String>();      
  
  // Put elements to the map 
  tree_map1.put("C1", "Red");
  tree_map1.put("C2", "Green");
  tree_map1.put("C3", "Black");
  tree_map1.put("C4", "White"); 
    
  System.out.println(tree_map1);
        if(tree_map1.containsKey("C1")){
            System.out.println("The Tree Map contains key C1");
        } else {
            System.out.println("The Tree Map does not contain key C1");
        }
        if(tree_map1.containsKey("C5")){
            System.out.println("The Tree Map contains key C5");
        } else {
            System.out.println("The TreeMap does not contain key C5");
        }
    }
}

Sample Output:

{C1=Red, C2=Green, C3=Black, C4=White}                                 
The Tree Map contains key C1                                           
The TreeMap does not contain key C5

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