Java: Check whether the character immediately before and after a specified character is same in a given string

Last update on December 21 2024 09:44:07 (UTC/GMT +8 hours)

Write a Java program to check whether the character immediately before and after a specified character is the same in a given string.

Visual Presentation:

Sample Solution:

Java Code:

import java.util.*;

// Define a class named Main
public class Main {

  // Method to check if characters before and after '#' are the same
  public boolean leftAndRightSame(String stng) {
    int l = stng.length(); // Get the length of the given string 'stng'
    boolean found = true; // Initialize a boolean variable 'found' as true

    // Loop through each character in the given string 'stng'
    for (int i = 0; i < l; i++) {
      String tmpString = stng.substring(i, i + 1); // Extract each character of 'stng' individually

      // Check if the character is '#', and it's not the first or last character
      if (tmpString.equals("#") && i > 0 && i < l - 1) {
        // Check if the character before '#' is equal to the character after '#'
        if (stng.charAt(i - 1) == stng.charAt(i + 1)) {
          found = true; // Set 'found' to true if characters before and after '#' are the same
        } else {
          found = false; // Set 'found' to false if characters before and after '#' are different
        }
      }
    }
    return found; // Return the result whether characters before and after '#' are the same or not
  }

  // 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 = "moon#night"; // Given string

    // Display the given string and the result of checking characters before and after '#'
    System.out.println("The given string is: " + str1);
    System.out.println("The before and after character are same: " + m.leftAndRightSame(str1));
  }
}

Sample Output:

The given string is: moon#night
The before and after character are same: true

The given string is: bat##ball
The before and after character are same: false

The given string is: #moon#night
The before and after character are same: true

Flowchart:

Java Code Editor:

Improve this sample solution and post your code through Disqus

Previous: Write a Java program to create a new string from a given string after removing the 2nd character from the substring of length three starting with 'z' and ending with 'g' presents in the said string.
Next: Write a Java program to check whether two strings of length 3 and 4 appear in same number of times in a given string.