SignedText is #2 from the from the 2025 AP Computer Science A Free Response problems.
https://apcentral.collegeboard.org/media/pdf/ap25-frq-computer-science-a.pdf
SignedText class
public class SignedText
{
private String first, last;
public SignedText(String first, String last)
{
this.first = first;
this.last = last;
}
public String getSignature()
{
if(first.length() > 0)
return first.substring(0, 1) + "-" + last;
else
return last;
}
public String addSignature(String message)
{
String signature = getSignature();
int index = message.indexOf(signature);
if(index == 0)
return message.substring(signature.length()) + signature;
else if(index == -1)
return message + signature;
else
return message;
}
}
Java files with test code
2025 AP CS Exam Free Response Solutions
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