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I'm just allowed to change Mutated.java . Is there a way to do it?

Main.java

public class Main {
public static void main(String[] args) throws Exception {
Original object = new Original();
System.out.print(object.doit());
}
}

Original.java

Hello

I have a external jar library that has many classes and methods. My question is, how can I rewrite a existing method without changing the library?

Ex:

(External jar)
Class Original{...