float

[Lily Zulkipli]

Dear Java experts.Help! I'm 1 month beginner.

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.PrintWriter;
import java.util.*;

public class AB123 {

	public static void main (String[]args)throws FileNotFoundException 
	{
		char orderCode = 0;
		double quantityOrdered;
		float retailerCode;
		String Orange;
		String Pte;
		String Ltd;
		
		
		Scanner infile = new Scanner(new FileReader("AB123_data.txt"));
		
		PrintWriter outfile = new PrintWriter("AB123_report.txt");
		
		if (infile.hasNextFloat())				
			retailerCode = infile.nextFloat();
		orderCode = infile.next().charAt(0);
		quantityOrdered = infile.nextDouble();
		Orange = infile.next();
		Pte = infile.next();
		Ltd = infile.next();
				
		outfile.printf("RETAILER AB123  ORANGE PTE LTD", retailerCode, orderCode, quantityOrdered, Orange, Pte, Ltd);
		outfile.println(" ");
		outfile.println("______________");
		outfile.println();
				
		System.out.println("File successful");
			
		infile.close();
		outfile.close();
	}
}

This is my TextFile

a 54 AB123 Orange Pte Ltd

I have problem with AB123

[Edit - added code tags - MB]

[Ove Lindström]

Greetings and welcome to the Ranch.

While we analyze your problem, please read http://www.javaranch.com/name.jsp and correct your username.

If that is your name... Kewl one!

[Ove Lindström]

But your main issue is that you are trying to convert the String AB123 to a float. And it is not a float.

[Matthew Brown]

Hi Lily. Welcome to The Ranch!

We can help you more effectively if you let us know exactly what error you're getting, or what it's doing that you don't expect.

[Ove Lindström]

I made some changes in your code.

package lilly;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.PrintWriter;
import java.util.Scanner;

public class ABCParser {

	public static void main(String[] args) throws FileNotFoundException

	{

		String orderCode = "0";
		double quantityOrdered;
		String retailerCode;
		String orange;
		String pte;
		String ltd;


		Scanner infile = new Scanner(new File("<path_to>/ABC123_data.txt"));

		PrintWriter outfile = new PrintWriter("<path_to>/AB123_report.txt");

	
		// Reading the string 'a 54 AB123 Orange Pte Ltd'
		orderCode = infile.next(); // Read the 'a' as a string.
		quantityOrdered = infile.nextInt(); // Read 54 as an integer
		retailerCode = infile.next(); // Read 'AB123' as a Strting
		orange = infile.next(); // Read 'Orange'
		pte = infile.next(); // Read 'Pte'
		ltd = infile.next(); // Read 'Lte'

		// Format the output string. We need to use the format signs (%s for string and %f for the float).
		outfile.printf("RC=%s, OC=%s, Q=%f, ORA=%s, PTE=%s, LTD=%s", retailerCode,
				orderCode, quantityOrdered, orange, pte, ltd);
		outfile.println(" ");
		outfile.println("______________");
		outfile.println();

		System.out.println("File successful");

		infile.close();
		outfile.close();
	}
}

I think what you have missed is how the Scanner works. The method nextFloat() won't lookup the next suitable float, it will look at the next token and see if it fits into a float. Same with hasNextFloat().

[Campbell Ritchie]

Actually hasNextFloat is useful if there are problems.

while (!myScanner.hasNextFloat())
{
   System.out.println("That isn't a number: try again: "); // or something ruder
   myScanner.next();
}
float f = myScanner.nextFloat();

But why are you using floats in the first place? You don't usually use floats for retailer codes. If the retailer is ABC123, that's a String, and you can pick it up with the next() method in your Scanner.
You won't get much output from printf if you don't have any % tags.

[Lily Zulkipli]

AB123 is a combination of letters and digits. I thought if it's combined, it's float since we've never used this before.

Thank You ALL so much! this forum really does help me. Congratulations for creating this forum!!

[Campbell Ritchie]

You're welcome, and thank you for changing your name.

[Jesper de Jong]

Lily Zulkipli,
Your post was moved to a new topic.
Please don't add a new, unrelated question to an existing post.