Replace multiple consecutive occurrences of a character with a single occurrence

Question

I am making a natural language language processing application in Java, I am using data from IMDB and Amazon.

I came across a certain dataset which has words like

Answer 1

Try using loop,

 String word="Stoooppppd";
    StringBuilder res=new StringBuilder();
    char first=word.charAt(0);
    res.append(first);
    for (int i = 1; i < word.length(); i++) {
        char ch=word.charAt(i);
        if(ch!=first){
           res.append(ch);
        }
       first=ch;
    }
    System.out.println(res);