Java: Append the specified element to the end of a hash set

Last update on May 22 2025 13:15:52 (UTC/GMT +8 hours)

1. Append Element to HashSet

Write a Java program to append the specified element to the end of a hash set.

Sample Solution:

Java Code:

import java.util.HashSet;
  public class Exercise1 {
  public static void main(String[] args) {
     // Create a empty hash set
     HashSet<String> h_set = new HashSet<String>();
   // use add() method to add values in the hash set
          h_set.add("Red");
          h_set.add("Green");
          h_set.add("Black");
          h_set.add("White");
          h_set.add("Pink");
          h_set.add("Yellow");

   // print the hash set
   System.out.println("The Hash Set: " + h_set);
   }
}

Sample Output:

The Hash Set: [Red, White, Pink, Yellow, Black, Green]

Pictorial Presentation:

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to add an element to a HashSet and verify its presence using the contains() method.
• Write a Java program to append multiple elements to a HashSet and then convert it to a TreeSet to display the elements in sorted order.
• Write a Java program to concurrently add elements to a HashSet from multiple threads ensuring thread safety.
• Write a Java program to add an element to a HashSet, remove it, and then re-add it to observe the effect on the set's ordering.

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