Recursion String in Java and removing characters

Question

Here is what I have so far, but DrJava doesnt seem to compile it. It is supposed to print out "!olleH".. and I keep getting these errors: cannot find symbol : class Sentence, cannot find symbol : method reverse(), cannot find symbol : method getText().

public class SentenceTester
{
   public static void main(String[] args)
   {
      String greeting = new Sentence("Hello!");
      String.reverse();
      System.out.println(greeting.getText());
   }
}

I am also supposed to(once this is running) implement a recursive solution by removing the first character, reversing a sentence consisting of the remaining text, and combining the two.

I am not asking for my homework to be done but better yet a barebones code because I really dont know where to start.

Thanks

Answer 1

There is no reverse() method in String class. You can use a StringBuilder instead:

String greeting = "Hello!"
StringBuilder sb = new StringBuilder(greeting);
greeting = sb.reverse().toString();

See StringBuilder.reverse() .

Also, I don't know what the Sentence class is, but you probably can't initialize a String with it.