Question

public class recursionExcercise4
{

  public static void main (String[] args)
  {
    boolean statement=false;
    String ch="";
    String a="I am bubbles who is a little slugger and loves apple and yellow."
    BacktoBacks(a,ch,statement);
  }

  public static void BacktoBacks(String sentence, String ch, boolean statement)
  {
    String newLine="",word="";
    System.out.print(sentence.charAt(0));
    if(sentence.charAt(0)=='.') System.out.println();

    if(sentence.length()>1)
    {
      int num=sentence.substring(1).indexOf(" ");
      word = sentence.substring(0,num);
      System.out.println(word);
    }
    BacktoBacks(newLine,ch,statement);
  }
}

That is the code.

The lines inside the if statement loop were added by me so you can change that but nothing else can be changed. The if statement on top must remain there. Also, I am trying to avoid loops as it makes it too easy then. Any way to do this? I tried it but need help.

The objective is to print out the words from the string that have double letters. This should also be printed backwards. So like this:

Yellow
Apple
Slugger
Little
Bubbles

Your help is much appreciated.
Thanks!!

Answer 1

So you need a function to check whether a word contains double letters,

public boolean hasDoubleLetters(String word){
    // test
}

and based on its outcome, print the word after the recursive call. And you have to pass the correct argument to the recursive call.