Java: Read a string and returns after removing a specified character and its immediate left and right characters

Last update on March 17 2025 13:22:45 (UTC/GMT +8 hours)

Write Java program to read a string and return after removing specified characters and their immediate left and right adjacent characters.

Visual Presentation:

Java String Exercises: Read a string and returns after removing a specified character and its immediate left and right characters.

Sample Solution:

Java Code:

import java.util.*;

// Define a class named Main
public class Main {

    // Method to exclude '#' character considering some conditions from the input string
    public String excludeHash(String stng) {
        int len = stng.length(); // Get the length of the input string
        String resultString = ""; // Initialize an empty string to store the result

        // Iterate through each character in the input string
        for (int i = 0; i < len; i++) {
            // If the current character is the first character and it is not '#', append it to the resultString
            if (i == 0 && stng.charAt(i) != '#')
                resultString += stng.charAt(i);

            // If the current character is not '#' and the previous character and current character both are not '#', append it to the resultString
            if (i > 0 && stng.charAt(i) != '#' && stng.charAt(i - 1) != '#')
                resultString += stng.charAt(i);

            // If the current character is '#' and the previous character is not '#', remove the last character from resultString
            if (i > 0 && stng.charAt(i) == '#' && stng.charAt(i - 1) != '#')
                resultString = resultString.substring(0, resultString.length() - 1);
        }
        return resultString; // Return the modified 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 = "test#string"; // Input string

        // Display the given string and the new string using excludeHash method
        System.out.println("The given strings is: " + str1);
        System.out.println("The new string is: " + m.excludeHash(str1));
    }
}

Sample Output:

The given strings is: test#string
The new string is: testring

The given strings is: test##string
The new string is: testring

The given strings is: test#the#string
The new string is: teshtring

Flowchart:

Flowchart: Java String Exercises - Read a string and returns after removing a specified character and its immediate left and right characters.

For more Practice: Solve these Related Problems:

Write a Java program to remove occurrences of a specific character along with its immediate left and right neighbors.
Write a Java program to delete a target character and its adjacent characters using iterative processing.
Write a Java program to filter out a specified character and the characters directly adjacent to it from a string.
Write a Java program to remove a designated character along with one character on its left and right, handling overlapping cases.

Java Code Editor:

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Next: Write a Java program to return the substring that is between the first and last appearance of the substring 'toast' in the given string,or return the empty string if substirng 'toast' does not exists.