Java Collection, TreeSet Exercises: Add all the elements of a specified tree set to another tree set

Java Collection, TreeSet Exercises: Exercise-3 with Solution

Write a Java program to add all the elements of a specified tree set to another tree set.

Sample Solution:

Java Code:

import java.util.TreeSet;
public class Exercise3 {
  public static void main(String[] args) {
  TreeSet<String> tree_set1 = new TreeSet<String>();
  System.out.println("Tree set1: "+tree_set1);
  TreeSet<String> tree_set2 = new TreeSet<String>();
  System.out.println("Tree set2: "+tree_set2);
   // adding treetwo to treeone
   System.out.println("Tree set1: "+tree_set1);

Sample Output:

Tree set1: [Green, Orange, Red]                                        
Tree set2: [Black, Pink, White]                                        
Tree set1: [Black, Green, Orange, Pink, Red, White] 


Flowchart: Add all the elements of a specified tree set to another tree set

Java Code Editor:

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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