Java: Create a new string repeating every character twice of a given string

Last update on December 21 2024 10:03:06 (UTC/GMT +8 hours)

Write a Java program to create a string containing every character twice of a given string.

Visual Presentation:

Sample Solution:

Java Code:

import java.util.*;

// Define a class named Main
public class Main {

  // Method to repeat each character in the given string 'stng' twice
  public String repeatAllTwice(String stng) {
    int l = stng.length(); // Get the length of the given string 'stng'
    String newstring = ""; // Initialize an empty string to store the new string

    // Loop through each character of the string
    for (int i = 0; i < l; i++) {
      // Append the character at index 'i' in 'stng' twice to the 'newstring'
      newstring += stng.substring(i, i + 1) + stng.substring(i, i + 1);
    }
    return newstring; // Return the new string with characters repeated twice
  }

  // 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 = "welcome"; // Given string

    // Display the given string and the new string with characters repeated twice
    System.out.println("The given string is: " + str1);
    System.out.println("The new string is: " + m.repeatAllTwice(str1));
  }
}

Sample Output:

The given string is: welcome
The new string is: wweellccoommee

Flowchart:

Java Code Editor:

Improve this sample solution and post your code through Disqus

Previous: Write a Java program to check whether the string 'red' and 'blue' appear in same number of times in a given string.
Next: Write a Java program to make a new string from two given string in such a way that, each character of two string will come respectively.