This question involves a class that manages text with signatures. A SignedText object stores a signature string and provides methods to work with that signature.

Signature Format

A signature is created from a person's first name and last name. The signature consists of the entire first name followed by the first character of the last name.

For example, if the first name is "Ada" and the last name is "Lovelace", the signature would be "AdaL".

Class Requirements

You will write the complete SignedText class with:

• Constructor: Takes a first name and last name, creates the signature
• getSignature(): Returns the signature string
• addSignature(String text): Adds or removes signature from text based on rules below

addSignature Method Rules

The addSignature method takes a text string and returns a modified version according to these rules:

1. If the text starts with the signature, return the text with the signature removed from the beginning
2. Otherwise, if the text ends with the signature, return the text with the signature removed from the end
3. Otherwise, return the text with the signature appended to the end

Example Execution

Precondition: The last name parameter will always have length ≥ 1.

Write the complete SignedText class, including:

• Any necessary instance variables
• A constructor that takes two String parameters: first name and last name
• The getSignature method
• The addSignature method

Your implementation must meet all specifications described above and match the example behavior shown in the table.

Write Your Solution

Check Your Code

public class SignedText
{
    private String signature;
    
    public SignedText(String firstName, String lastName)
    {
        signature = firstName + lastName.substring(0, 1);
    }
    
    public String getSignature()
    {
        return signature;
    }
    
    public String addSignature(String text)
    {
        if (text.startsWith(signature))
        {
            return text.substring(signature.length());
        }
        else if (text.endsWith(signature))
        {
            return text.substring(0, text.length() - signature.length());
        }
        else
        {
            return text + signature;
        }
    }
}