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:

Contribute your code and comments through Disqus.

What is the difficulty level of this exercise?

Java: Tips of the Day

Try and catch:

Java is excellent at catching errors, but it can only recover gracefully if you tell it what to do. The cascading hierarchy of attempting to perform an action in Java starts with try, falls back to catch, and ends with finally. Should the try clause fail, then catch is invoked, and in the end, there's always finally to perform some sensible action regardless of the results. Here's an example:

try {
        cmd = parser.parse(opt, args); 
        if(cmd.hasOption("help")) {
                HelpFormatter helper = new HelpFormatter();
                helper.printHelp("Hello ", opt);
        else {
                if(cmd.hasOption("shell") || cmd.hasOption("s")) {
                String target = cmd.getOptionValue("tgt");
                } // else
        } // fi
} catch (ParseException err) {
        } //catch
        finally {
                new Hello().helloWorld(opt);
        } //finally
} //try

It's a robust system that attempts to avoid irrecoverable errors or, at least, to provide you with the option to give useful feedback to the user. Use it often, and your users will thank you!

Ref: https://red.ht/3EZc9OC