Calling a method in the same class

I am able to do this with userInput = readData(userInput), but I don't know how to just do something like "call printData();) or something. Basically call it to run out of thin air.

Quote:

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Originally Posted by Teclis

I am able to do this with userInput = readData(userInput), but I don't know how to just do something like "call printData();) or something. Basically call it to run out of thin air.

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When writing your questions here, it's always best to assume that we can't read your mind, that we don't know what your code looks like and that we haven't the foggiest clue as to the details of your problem if you don't tell them.

I apologize,

Code:

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import java.util.Scanner;
public class Lab10
{
  public static void main(String[] args)
  {
      // Declare any need variables here
      int i;
      Scanner scan = new Scanner(System.in);
      String userInput, userOutput;


      // Write a loop that will loop through as many inputs as are in the file
      while(scan.hasNext())
      {
        // Call the readData method here.
        // Store the result into userInput.
        userInput = readData(userInput);



        // Call the printData method here.



      } // End of file loop
  } // End of main method


  public static String readData(String userInput)
  {
      Scanner scan = new Scanner(System.in);
      // Read in the users input.
      // Remember to use all defensive programming techniques.
      // We are reading an entire line of input.
      userInput = scan.nextLine();
      if(userInput.length() <= 1)
      {
        System.out.println("String not long enough. \n Quitting program");
        System.exit(0);
      }

      // Return the String that was read in.
      return userInput;

  } // End of readData method

  public static void printData(String userInput, String userOutput)
  {
      // Print out the user input with appropriate label.
      System.out.println("Input - " + userInput);

      // Create the reverse of the user's input.
      // Hint: You might want to review Homework 9 problem 2
      for (int i=0; i<userInput.length(); i++)
      {
        userOutput = userInput.substring(i, i+1) + userOutput;
      }
      // Print out the user input in reverse with appropriate label.
      System.out.println("Reverse - " + userOutput);
}
}

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Like I called readData with userInput = readData(userInput), I, sort of, need to call printData to run.

How would I do that?

Code:

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userInput = readData(userInput);

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For starters, why do you pass userInput to the method? The whole point of the method is to get the user to enter something. If you do not have anything what is the point of passing nothing to the method. Same goes for the printData method. The point of the method is to generate the userOutput, so why are you passing it to the method?

If you want to call the printData method then just call it. Since the method has a void return type you cannot assign it to anything. Think Nike: Just do it!

Code:

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userInput = readData();
printData(userInput);

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Quote:

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Originally Posted by Junky

Code:

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userInput = readData(userInput);

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For starters, why do you pass userInput to the method? The whole point of the method is to get the user to enter something. If you do not have anything what is the point of passing nothing to the method. Same goes for the printData method. The point of the method is to generate the userOutput, so why are you passing it to the method?

If you want to call the printData method then just call it. Since the method has a void return type you cannot assign it to anything. Think Nike: Just do it!

Code:

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userInput = readData();
printData(userInput);

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I honestly didn't exactly know what I was doing there. However the "printData(userInput)" isnt exactly sending what was read in by readData to printData. Im still tinkering but, not exactly sure. Is there something Im not doing in readData that will read it into a variable and send it back into the main method?

Quote:

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Originally Posted by Teclis

Is there something Im not doing in readData that will read it into a variable and send it back into the main method?

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We don't read minds. How are we supposed to answer that without seeing the latest version of your code?

Quote:

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Originally Posted by Junky

We don't read minds. How are we supposed to answer that without seeing the latest version of your code?

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/facepalm; Sorry again!

Code:

---

import java.util.*;
public class Lab10
{

  public static void main(String[] args)
  {
      // Declare any need variables here
      int i;
      Scanner scan = new Scanner(System.in);
      String userInput;


      // Write a loop that will loop through as many inputs as are in the file
      while(scan.hasNext())
      {
        // Call the readData method here.
        // Store the result into userInput.
        userInput = readData();



        // Call the printData method here.
        printData(userInput);


      } // End of file loop
  } // End of main method


  public static String readData(Scanner scann)
  {
      Scanner scan = new Scanner(System.in);
      // Read in the users input.
      // Remember to use all defensive programming techniques.
      // We are reading an entire line of input.
      userInput = scan.nextLine();
      if(userInput.length() <= 1)
      {
        System.out.println("String not long enough. \n Quitting program");
        System.exit(0);
      }

      // Return the String that was read in.
      return userInput;

  } // End of readData method
  public static void printData(String line, String userInput)
  {

      // Print out the user input with appropriate label.
      System.out.println("Input - " + userInput);

      // Create the reverse of the user's input.
      // Hint: You might want to review Homework 9 problem 2
      for (int i=0; i<userInput.length(); i++)
      {
        line = userInput.substring(i, i+1) + line;
      }
      // Print out the user input in reverse with appropriate label.
      System.out.println("Reverse - " + line);
      return;
  } // End of printData method

} // End of class Lab10

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Code:

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printData(userInput);
public static void printData(String line, String userInput)

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Parameters do not match.

Also, confused. Your comments say that you read the inputs from a file but your code gets user input from the command line.

Quote:

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Originally Posted by Junky

Code:

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printData(userInput);
public static void printData(String line, String userInput)

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Parameters do not match.

Also, confused. Your comments say that you read the inputs from a file but your code gets user input from the command line.

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Im supposed to be using UNIX for this, with doing a command of "java Lab10 < Lab10.data".

Im thinking about scrapping what I've got for most of the program and restarting, keeping only the reversing code.