Java: Iterate through all elements in a tree set

Last update on May 22 2025 13:14:27 (UTC/GMT +8 hours)

2. Iterate TreeSet Elements

Write a Java program to iterate through all elements in a tree set.

Sample Solution:

Java Code:

import java.util.TreeSet;
public class Exercise2 {
  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");
  // Print the tree list
  for (String element : tree_set) {
    System.out.println(element);
    }
 }
}

Sample Output:

Black                                                                  
Green                                                                  
Orange                                                                 
Red                                                                    
White 

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to iterate over a TreeSet using an Iterator and print each element along with its hash code.
• Write a Java program to iterate through a TreeSet using a for-each loop and conditionally print only those elements that start with a vowel.
• Write a Java program to traverse a TreeSet using Java 8 streams and print each element in uppercase.
• Write a Java program to iterate over a TreeSet in reverse order by converting it to a descending set and then printing each element.

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