Java: Create a new tree set, add some colors and print out the tree set

Last update on May 22 2025 13:15:46 (UTC/GMT +8 hours)

1. Create and Print TreeSet

Write a Java program to create a tree set, add some colors (strings) and print out the tree set.

Sample Solution:

Java Code:

import java.util.TreeSet;
public class Exercise1 {
  public static void main(String[] args) {
  TreeSet<String> tree_set = new TreeSet<String>();
  tree_set.add("Red");
  tree_set.add("Green");
  tree_set.add("Orange");
  tree_set.add("White");
  tree_set.add("Black");
  System.out.println("Tree set: ");
  System.out.println(tree_set);
 }
}

Sample Output:

Tree set:                                                              
[Black, Green, Orange, Red, White]

Flowchart:

For more Practice: Solve these Related Problems:

Write a Java program to create a TreeSet of color names, add duplicate values, and then print the set to verify that duplicates are eliminated.
Write a Java program to create a TreeSet of colors and then use a custom Comparator to sort them by the length of the color name.
Write a Java program to create a TreeSet of colors and add elements in random order, then print the set to demonstrate its natural ordering.
Write a Java program to create a TreeSet of colors, convert each color to lowercase before insertion, and then display the sorted unique set.

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