public class final6 {    public static int findme(int key)       {        if ((key == 1) || (key == 3))           return (key);               else           return(key + findme(key - 1));     }       public static void main(String[] args)   {          int found;       found = findme(findme(5) + findme(4));       System.out.println(found);       return;    }   }

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Methods of StringBuilder class

The StringBuilder class can be used to create mutable strings. The methods defined in the StringBuilder class are widely used to manipulate and concatenate strings. It is a non-synchronized class which has public methods that can be accessed by multiple threads. It is not thread-safe.