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Ace the AP Computer Science Exam for High Schoolers

Solution Review: Message Encryption

Explore how to implement message encryption in Java by applying string methods such as toLowerCase, substring, and replace. Understand the step-by-step process of modifying strings to create encrypted messages, which is essential for mastering Java string manipulation in the AP Computer Science course.

We'll cover the following...

Rubric

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Solution

Java
class RunEncryption 
{
    public static void main(String args[]) 
    {
        // Encrypting a String
        System.out.println(encrypt("hefOP830nskdd0qSW uIm", '0', '.', "tuy83AB9"));    
    }
    // Method to encrypt the string
    public static String encrypt(String stringToBeEncrypted, char oldChar, char newChar, String extraString)
    {
        String str = stringToBeEncrypted.toLowerCase();
        String update = str.substring(0, str.length()/2) + extraString + str.substring(str.length()/2);
        return update.replace(oldChar, newChar);
    }
}

Rubric-wise

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