Read a text file and assign values to variables

Question

Java beginner here but I am sincerely trying. The goal of this program is to read two values from the Realtor11.txt file and assign them to variables.

The contents of Realtor11.txt is (no spaces):

John

100

See section // Read Realtor11.txt Not sure what I'm doing wrong but currently the error is

Realtor11.java:48: error: incompatible types price = in.readLine(); ^ required: double found: String 1 error Error: Could not find or load main class Realtor11 [Finished in 1.1s]

// java class for keyboard I/O
import java.util.Scanner;
// java class for JOption GUI
import javax.swing.JOptionPane;
// File reader
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;

public class Realtor11
{
    public static void main(String[] args)
    {
    // Keyboard and file input
        Scanner console = new Scanner(System.in); 
        Scanner inputStream = null;
    // price of the house, the cost to sell the house and the commission
        double price, cost, commission;
    // seller’s name
        String seller; 

    // GUI diplay message declaration
        String display_message = "This program calculates the cost to sell a home\n" 
        + "and the commission paid to an individual sales agent.\n\n"
        + "The user is asked for the last name of the seller and the\n"
        + "sales price.\n\n";

    // Output descriptive messages
        JOptionPane.showMessageDialog(null, display_message, "Lab 1 Description", JOptionPane.INFORMATION_MESSAGE);

    // Read Realtor11.txt
        try {
            BufferedReader in = new BufferedReader(new FileReader("Realtor11.txt"));
            while (in.read()!= -1);
            seller = in.readLine();
            price = in.readLine();
            in.close();
            } 
            catch (IOException e) {}

    // calculate the cost and the commission
        cost = 0.06 * price;
        commission = 0.015 * price;
    // display the input and results
        String 
            out1 = String.format("%nThe " + seller + "’s" + " home sold for $%.2f%n", price),
            out2 = String.format("The cost to sell the home was $%.2f%n", cost),
            out3 = String.format("The selling or listing agent earned $%.2f%n", commission);

        JOptionPane.showMessageDialog(null, out1 + out2 + out3, seller + "'s Home Sale", JOptionPane.INFORMATION_MESSAGE);

    // Output to file
    // still writing this. 

    }
}

But I'm Not A Wrapper Class · Accepted Answer · 2014-01-28 21:00:56Z

5

The method readLine() returns a String value where you're expecting a double value (see API). You must convert the String value to a double as so:

price = Double.parseDouble(in.readLine());

answered Jan 28, 2014 at 21:00

But I'm Not A Wrapper Class

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2 Comments

ismail_1 Over a year ago

Thank you ! I had no idea I could do that. I read the Oracle docs and did not find this kind of syntax.

But I'm Not A Wrapper Class Over a year ago

No problem. Just remember you have to convert when needed. Also, if you found this answer to be correct, mark it correct as so: meta.stackexchange.com/questions/5234/…

JasonTTT · Accepted Answer · 2014-01-28 21:04:09Z

0

the readline() function returns a string. What you would need to do is to manually convert that price string to a double double price = Double.parseDouble(string version of price);

answered Jan 28, 2014 at 21:04

JasonTTT

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