Java: Repeat a specific number of characters for specific number of times from the last part of a string

Last update on May 21 2025 12:49:59 (UTC/GMT +8 hours)

78. Repeat Last N Characters

Write a Java program to repeat a specific number of characters for a specific number of times from the last part of a given string.

Visual Presentation:

Sample Solution:

Java Code:

import java.util.*;

// Define a class named Main
public class Main {
  
  // Method to repeat the last 'no_repeat' characters of a string 'stng' 'no_repeat' times
  public String lastNchrRepeat(String stng, int no_repeat) {
    int l = stng.length(); // Get the length of the given string 'stng'
    String new_word = ""; // Initialize an empty string to store the resulting word

    // Loop 'no_repeat' times to concatenate the last 'no_repeat' characters of 'stng' 'no_repeat' times
    for (int i = 0; i < no_repeat; i++) {
      new_word += stng.substring(l - no_repeat, l); // Extract the last 'no_repeat' characters of 'stng' and concatenate them to 'new_word'
    }
    return new_word; // Return the concatenated string
  }

  // Main method to execute the program
  public static void main(String[] args) {
    Main m = new Main(); // Create an instance of the Main class

    String str1 = "string"; // Given string
    int no_char = 3; // Number of times to repeat the last characters

    // Display the given string and the number of times to repeat
    System.out.println("The given string is: " + str1);
    System.out.println("The new string after repetition: " + m.lastNchrRepeat(str1, no_char));
  }
}

Sample Output:

The given string is: string
The new string after repetition: inginging

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to extract the last k characters of a string and repeat them n times to form a new string.
• Write a Java program to replicate the ending segment of a string a given number of times.
• Write a Java program to take the last part of a string and duplicate it multiple times, then concatenate the results.
• Write a Java program to repeat a substring from the end of a string, ensuring the repeated segment has a fixed length.

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