Thread: Program not printing anything

So I've gotten help already with this program, but I can't seem to get it to print. I know I have to call the methods containing the println statements, but I'm not sure how to go about this. Below is my program. It is supposed to read a string, and then print out the letters in the string and how many times that letter appeared in the string. Then, at the end, it should print out the most frequent letter and how many times that letter appeared. Thanks in advance!

import java.util.*;
 
public class LetterDriver{
  public static void main(String[] args){
    Scanner scan = new Scanner(System.in);
    String tScan= " ";
    while(tScan.length() > 0){
      tScan = scan.nextLine();
    }
  }
}

public class LetterProfile
{
  int scoreboard[] = new int [26];
  private int index;
  private int next;
  private int largest =0;
  private int largestindex =0;
 
 public void countChars (String s)
  {
    s.toLowerCase();
    char a = 'a';
    for (int i =0;i < s.length();i++)
    {
      int next = (int)s.charAt(i)-(int) a;
      if ( next<26 && next >= 0) //if the character is a-z
        scoreboard[next]++;
    }
 }
    public void scoreLine (String line)
    {
      int index = line.length();
      for (int j = 0; j<index; j++)
      {
        scoreboard[j]++;
        System.out.println(j + scoreboard[j]);
      }
    }
    public int largestLength()
    {
      int largest = 0;
      int largestindex = 0;
      for(int a = 0; a<26; a++)
      {
        if(scoreboard[a]>largest)
        largest = scoreboard[a];
        largestindex = a;
      }
      return(char)largestindex;
    }
    public int printResults()
    {
      largestLength();
     System.out.println(largestLength());
    }
 }

Yes, that was my thread. But I tried calling the two methods in the driver and nothing I do works. I am brand new to computer programming so I'm sure I'm just doing it wrong.

I deleted them because they weren't working. I don't know where or how to call these methods but this is one of the ways I tried:

import java.util.*;
 
public class LetterDriver{
  public static void main(String[] args){
    Scanner scan = new Scanner(System.in);
    String tScan= " ";
    while(tScan.length() > 0){
      tScan = scan.nextLine();
    }
    scoreLine();
    largestLength();
  }
}

--- Update ---

Wait, I didn't call the largestLength method I called the printResults method.

I also tried this:

import java.util.*;
 
public class LetterDriver{
  public static void main(String[] args){
    Scanner scan = new Scanner(System.in);
    String tScan= " ";
    while(tScan.length() > 0){
      tScan = scan.nextLine();
    }
    scoreboard.scoreLine();
    scoreboard.printResults();
  }
}

and this:

import java.util.*;
 
public class LetterDriver{
  public static void main(String[] args){
    Scanner scan = new Scanner(System.in);
    String tScan= " ";
    while(tScan.length() > 0){
      tScan = scan.nextLine();
    }
    tScan.scoreLine();
    tScan.printResults();
  }
}

The while loop makes the program stop scanning lines once the user has pressed enter twice (or enters a string of length zero).

am I getting closer?

import java.util.*;
 
public class LetterDriver{
  public static void main(String[] args){
    System.out.println("Enter lines of text, type two returns in a row to end.");
    Scanner scan = new Scanner(System.in);
    String tScan= " ";
    while(tScan.length() > 0){
      tScan = scan.nextLine();
    }
    LetterProfile k = new LetterProfile();
    k.printResults();
  }
}

The program is due tonight so sorry if I'm a little frustrated.

Nothing prints out. Before, it printed out an input box.

--- Update ---

When I type something in the interactions box, it says "Static Error: Undefined name 'Hello world!'".

I don't know how to use the java command. Yes, that message was from my IDE.

--- Update ---

I don't understand what you mean in post #8

I just tried that, it prints out "25", that's it. so I think his code is fine. also I found a few compilation errors

btw, kbrady, do you go to umass amherst? attend cmpsci 121? with Moll? this is prog 5?

Yes I'm in that class and I am not enjoying myself

--- Update ---

Nothing is printing for me still... idk what I'm doing wrong this is awful.

Enter lines of text, type two returns in a row to end.
[DrJava Input Box]
[DrJava Input Box]
>

LetterDriver.jpg

can you post a bigger pic? I can barely see anything lol

can you explain scoreLine? I didn't use that for my submission

LetterDriver.jpg

yeah I can't get a bigger pic

Please read and re-read Norm's post above.