Need help with exception in thread "main" java.lang.NumberFormatException

[chaos123456]

Hi all

import java.io.*;
public class POManager {
	private static String posFname = "C:/ITM200/OOP-Advanced-Topics/src/po.txt";
	private static String taxposFname = "C:/ITM200/OOP-Advanced-Topics/src/tax.txt";
	
	public static void main(String [] args) throws IOException {
		PO[] pos = readPOFile();
		writePOTaxFile(pos);
	}
	public static PO[] readPOFile() throws IOException {
		BufferedReader in = new BufferedReader(new FileReader(posFname));
		in.readLine();
		String line = in.readLine();
		int n = Integer.parseInt(line.trim());
		
		PO[] pos = new PO[n];
		
		int cntr=0;
		while( (line = in.readLine()) != null && cntr<n){
			pos[cntr] = readPOInfo(line.trim());
			cntr ++;
			}
			in.close();
			return pos;		
	}
	public static PO readPOInfo(String line){
		//name,date,pid,pname,uprice,quanity
		String[] fields = line.split(",");
		Product p = new Product(fields[3],Double.parseDouble(fields[4]),
		                        Integer.parseInt(fields[5]));
		                       
		PO po = new PO(fields[0],fields[1],Integer.parseInt(fields[2]),p);
		return po;
	}
	
	public static void writePOTaxFile(PO[] pos) throws IOException {
		BufferedWriter out = new BufferedWriter(new FileWriter(taxposFname));
		for (int i = 0;i<pos.length;i++){
			out.write(pos[i].toString() +"\n");
			System.out.println("write ..." + pos[i].toString());
		}
		out.close();
	}
}

and 2 classes:

public class PO {

	protected String name;
	protected String date;
	protected int pid;
	protected Product product;
	public double tax; 
	
	public PO(String name_, String date_, int pid_, Product p)
	{
		name = name_;
		date = date_;
		pid = pid_;
		product = p;
	}
	
	public String toString()
	{
		String s = name + "," +  date + "," +  pid + "," +  product;
		return s;
	} 
}

public class Product{
	protected int quanity;
	protected String type;
	protected double uprice;
	
	public double tax;
	
	public Product(String type_, double uprice_, int quanity_)
	{
		type = type_;
		uprice = uprice_;
		quanity = quanity_;
	}
	
	public void tax()
	{
		tax = 0.15*uprice*quanity;
	}
	
	public String toString()
	{
		String s = type + "," + uprice +"," + tax;
		return s;
	}
}

the txt input is sth like this:

2
A,Jan-02-2007,11,table,10.56,1
B,Feb-12-2007,14,chair,6.3,4

when i tried to run the program, here what i got:

Exception in thread "main" java.lang.NumberFormatException: For input string: "A,Jan-02-2007,11,table,10.56,1"
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
at java.lang.Integer.parseInt(Integer.java:449)
at java.lang.Integer.parseInt(Integer.java:499)
at POManager.readPOFile(POManager.java:14)
at POManager.main(POManager.java:7)

Process completed.

Dont know where i got it wrong :(

[chaospie]

You are trying to turn something into an Integer that cannot be turned into an Integer.
You are trying to turn "A,Jan-02-2007,11,table,10.56,1" into an Integer, which you can't do..
That is why you are getting a NumberFormatException. What exactly do you want to turn into an Integer..?

[chaos123456]

Im not trying to turn "A,Jan-02-2007,11,table,10.56,1" into integer
I turned the 1st line in txt file, which is "2" into integer in line 14. The rest were added to Product and PO class. I used split to split them and change them to int,double,string separately

[chaospie]

In the function readPOFile() you are calling in.readLine() twice, so will it not be the second line that you are reading:

public static PO[] readPOFile() throws IOException {
		BufferedReader in = new BufferedReader(new FileReader(posFname));

		// Calling it twice here....
                in.readLine();
		String line = in.readLine();
		int n = Integer.parseInt(line.trim());

So if the second line is "A,Jan-02-2007,11,table,10.56,1" then you are assigning the variable line to be that line, and then preceding to try to turn that into an Integer.

[chaos123456]

oh thanks
didnt notice that i typed readline 2 times

problem solved now