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Java program which opens a file containing integers, and print, counts and displays in output dialog box.(Using JOptionPane)

I have to create a java program which opens a file containing integers. An input dialog box asks the use the name of the input file, and then an output dialog box shows the values read from the data file, each on a different line, and then the number of values from the file. I am confused
as to what is missing from my code. The input dialog box appears but I am completely stuck after that.

import java.io.*;
import javax.swing.*;
import java.util.Scanner;

public class prob2

public static void main (String args) throws IOException

String name, out="", out2="" ;
int quantity=0, val;
name=JOptionPane.showInputDialog("Enter the name of the file to be opened: ");
Scanner inputFile= new Scanner(new FileReader(name));

while(inputFile.hasNextInt());

val=inputFile.nextInt();
out= val+"n";
quantity++;

JOptionPane.showMessageDialog(null,
val + quantity);
inputFile.close();




while (inputFile.hasNextInt());

;

2 Answers
2

Your initial problem is right here

while(inputFile.hasNextInt()); // <- Or here actually...


This is basically setting up an infinite loop instead of executing the block of ode you want

Start by removing the ; at the end of the line...

;

while(inputFile.hasNextInt())

val=inputFile.nextInt();
out= val+"n";
quantity++;



Once you've that, you will to change

JOptionPane.showMessageDialog(null,
val + quantity);


to

JOptionPane.showMessageDialog(null,
out + quantity);


to overcome the compiler error

And finally, you will need to change...

out = val + "n";


in your while-loop to

while-loop

out += val + "n";


so that you are actually concatenating the result

(and yes, we should be using StringBuilder, but I think we can let that one slide for now)

StringBuilder

StringBuilder

StringBuilder

String

You have to collect the input you are reading in and that you want to later print.

For example by creating a StringBuilder instance and appending the content you wish to present to the user.

When you are done reading you pass builder.toString() to another option pain as message.

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