如何在Java中传递变量？

Question

Consider this code:

private static void colourRead(String s) throws IOException {
    FileReader readhandle = new FileReader("C:\\****\\****");
    BufferedReader br = new BufferedReader(readhandle);
    String line = null;
    while ((line = br.readLine()) != null) {
        ColourInput(); //there's an error here
    }

    br.close();
    readhandle.close();
}

private static void ColourInput(String s) {
    char letter;

    String fullWord;
    Scanner kb = new Scanner(System.in);

    System.out.print("Enter whatever: ");

    fullWord = kb.nextLine();
    System.out.println(fullWord);

    for (int i = 0; i < fullWord.length(); i++) {
        letter = fullWord.charAt(i);
        switch (Character.toUpperCase(letter)) {
        case 'A': {
            Blue();
        }
            break;
        }
    }
}

Is it possible for me to carry the

line

variable from the colourRead method, and somehow assign it to the

fullWord 

variable in the ColourInput() method?

I'm trying to read a text file, and output certain colours associated to each letter. I don't want to create a new switch statement in the colourRead method because apparently, this is a bad programming practice.

Any help please?

If you're still unsure of what I'm asking I'll re-edit

EDIT: The problem is that after calling the ColourInput(line) method, the Scanner method comes in to work (original code). I don't want to remove my Scanner method, I want it to 'skip' the scanner method, and continue into the for loop and switch statements.

Answer 1

You're not passing the string to your call of ColourInput

Try

ColourInput(line);

It is also worth mentioning that your code that reads the file is not safe, you should try to read the file, catch the IOException and close the file in a finally clause, if your code crashes somewhere in the while loop your file might remain open

Answer 2

If I understand correctly you want to be able to repeat the functionality of the ColourInput method with the results of the the ColourRead method.

    private static void colourRead() throws IOException
{
    FileReader readhandle = new FileReader("C:\\****\\****");
    BufferedReader br = new BufferedReader(readhandle);
    String line = null;
    while((line = br.readLine()) != null)
    {
      ColourText(line); //there's an error here
    }

    br.close();
    readhandle.close();
}

private static void ColourInput() 
{

  String fullWord;
  Scanner kb = new Scanner(System.in);

  System.out.print("Enter whatever: ");

  fullWord = kb.nextLine();
  System.out.println(fullWord);
  ColourText(fullWord);
}

private static void ColourText(String text)
{

    char letter;
    for (int i = 0; i < text.length(); i++)
    {
      letter = text.charAt(i);
      switch(Character.toUpperCase(letter))
      {
          case 'A':
          {
             Blue();
          }
          break;
      }
}

This would let you color the text whether it is read from the file or input from the keyboard(using the ColourText method to change the color). But as other people have mentioned you should add to the file reading code as well.

Edit: You could also remove the String s variables from the first two methods since they are not being used in the methods anywhere.