In my code i have a try/catch statement where i am reading a file and defining the variable as an integer; however, when i try to edit the number and then write it back into the file, it can't see the variable. Find my code attached below
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
import javax.swing.*;
import java.io.*;
import java.awt.Color;
import java.awt.Font;
import java.io.*;
import java.util.ArrayList;
import java.util.Scanner;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
import javax.swing.filechooser.FileNameExtensionFilter;
/**
* Write a description of class topup here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class topup extends Actor
{
/**
* Act - do whatever the topup wants to do. This method is called whenever
* the 'Act' or 'Run' button gets pressed in the environment.
*/
public void act()
{
try
{
String result1 = readFile("Pointsr.txt");
int points=Integer.parseInt(result1);
// reading and creating an int variable
}
catch (Exception e){ e.printStackTrace(); }
if (Greenfoot.mouseClicked(this))
{
String passcode = JOptionPane.showInputDialog("Enter your 4 integer code");
int code=Integer.parseInt(passcode);
//asks a person who has a code for topup to enter passcode
if (code == 9876 )
{
String topup = JOptionPane.showInputDialog("Enter the number of credits you want to top up");//asking person who holds code for number of topup points
int x=Integer.parseInt(topup);//changing string to int
points = points + x; //adding the topup points
checkPoints(); // checking if you're points will go above thirty so you don't breach the limit
FileWriter fw = null; //below writing file
try
{
fw = new FileWriter("Pointsr.txt");
fw.write(""+points);
}
catch (Exception e){ e.printStackTrace(); }
finally
{
if(fw != null)
{
try { fw.close(); }
catch (Exception e) { e.printStackTrace(); }
}
}
}
}
}
public String readFile(String fileName)
{
InputStream istream = getClass().getResourceAsStream(fileName);
Scanner in = new Scanner(
new BufferedReader(
new InputStreamReader(istream)));
String text = "";
while (in.hasNextLine())
{
text += in.nextLine() + "\n";
}
return text;
}
public void checkPoints()
{
if (points >30)
{
System.out.println ("You can't top up, you have too many credits");
Greenfoot.stop();
}
}
}