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Java Collection, TreeMap Exercises: Associate the specified value with the specified key in a TreeMap

Java Collection, TreeMap Exercises: Exercise-1 with Solution

Write a Java program to associate the specified value with the specified key in a Tree Map.

Sample Solution:-

Java Code:

import java.util.*;  
public class Example1 {  
  public static void main(String args[]){  
   // Create a tree map
   TreeMap<Integer,String> tree_map=new TreeMap<Integer,String>();      
  // Put elements to the map 
  tree_map.put(1, "Red");
  tree_map.put(2, "Green");
  tree_map.put(3, "Black");
  tree_map.put(4, "White");
  tree_map.put(5, "Blue");
    
   for (Map.Entry<Integer,String> entry : tree_map.entrySet())
   {
    System.out.println(entry.getKey() + "=>" + entry.getValue());
   }
 }  
}

Sample Output:

1=>Red                                                                 
2=>Green                                                               
3=>Black                                                               
4=>White                                                               
5=>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