Java Tree Program

Question

I need to create a tree program using Java. I am unable to do this and ran out of ideas. It should use a for-loop and substring. Here is an example for a "sample" string:

          S
         SAS
        SAMAS
       SAMPMAS
      SAMPLPMAS
     SAMPLELPMAS
          S
          A
          M
          P 
          L
          E

Here is what i have got so far:

    Scanner input = new Scanner(System.in);

    String userWord, reverse = "";
    int size;

    System.out.print("Enter a word that is less than or equal to 10 characters: ");
    userWord = input.next();

    userWord = userWord.toUpperCase();

    size = userWord.length()-1;

    for (int i = 1; i <= userWord.length() + 1; i++) {
        System.out.print(userWord.substring(0, i));
        System.out.println(userWord.substring(0,i-1));
    }

Thanks for any help.

Answer 1

public static void main (String[] args) throws java.lang.Exception
{
    Scanner input = new Scanner(System.in);

    String userWord, reverse = "";
    int size;
    StringBuilder padding = new StringBuilder();

    System.out.print("Enter a word that is less than or equal to 10 characters: ");
    userWord = input.next();

    userWord = userWord.toUpperCase();
    reverse = new StringBuffer(userWord).reverse().toString();
    size = userWord.length();

    for(int i = 0; i < size; i++){
        padding.append(" ");
    }

    for (int i = 1; i <= size; i++) {
        System.out.print(padding.substring(0, size-i));
        System.out.print(userWord.substring(0, i));
        if(i > 1){
            System.out.println(reverse.substring(size+1-i, size));  //2 >= i  
        }else{
            System.out.println("");
        }
    }
    String pad = padding.substring(0, size-1).toString();
    for(int i = 0; i < size; i++){
        System.out.println(pad + userWord.charAt(i));
    }
}

Answer 2

You are currently using one for loop. You would need two. the first would go through the col and then row

for (int x = 1; x <= input; x++)
{
    for (int y = 0; y < x; y++)
    {
        System.out.print( // enter what you need here);
    }
    System.out.println();
}

Does that make any sense? Let me know if you still have problems