Java Collection, TreeMap Exercises: Copy a Tree Map content to another Tree Map content

Java Collection, TreeMap Exercises: Exercise-2 with Solution

Write a Java program to copy a Tree Map content to another Tree Map content.

Sample Solution:-

Java Code:

import java.util.*;  
public class Example2 {  
   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");
  tree_map1.put("C5", "Blue");
   System.out.println("Tree Map 1: "+tree_map1);
   TreeMap<String,String> tree_map2 = new TreeMap<String,String>();
   tree_map2.put("A1", "Orange");
   tree_map2.put("A2", "Pink");
   System.out.println("Tree Map 2: "+tree_map2);
   System.out.println("After coping map2 to map1: "+tree_map1);   

Sample Output:

Tree Map 1: {C1=Red, C2=Green, C3=Black, C4=White, C5=Blue}            
Tree Map 2: {A1=Orange, A2=Pink}                                       
After coping map2 to map1: {A1=Orange, A2=Pink, C1=Red, C2=Green, C3=Bl
ack, C4=White, C5=Blue}

Java Code Editor:

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Java: Tips of the Day


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