1. Introduction

In this blog post, we will explore a simple Java program that checks whether a given string starts with a specified prefix. This is a fundamental operation in string manipulation, often used for categorizing, sorting, or filtering strings based on their beginning sequences.

2. Program Steps

1. Define the main method which serves as the entry point of the program.

2. Initialize the string we want to check and the prefix.

3. Use the startsWith method of the String class to determine whether the string starts with the specified prefix.

4. Print the result.

3. Code Program

public class PrefixChecker {

    public static void main(String[] args) {
        // Step 2: Initialize the string we want to check and the prefix
        String mainString = "JavaProgrammingLanguage";
        String prefix = "Java";

        // Step 3: Use the startsWith method to check if the string starts with the specified prefix
        boolean startsWithPrefix = mainString.startsWith(prefix);

        // Step 4: Print the result
        System.out.println("Does the main string start with the specified prefix? " + startsWithPrefix);
    }
}

Output:

Does the main string start with the specified prefix? true

4. Step By Step Explanation

– Step 1: The program begins execution from the main method.

– Step 2: We initialize the mainString with the value "JavaProgrammingLanguage" and the prefix with the value "Java".

– Step 3: The startsWith method of the String class is invoked on mainString with prefix as the argument. The result is a boolean value indicating whether mainString starts with prefix.

– Step 4: Finally, we print out the result to the console.

This Java program is a simple demonstration of how to use the startsWith method for checking if a string starts with a certain prefix, which is useful in various programming scenarios.