This is in Java, I don\'t know what I\'m doing wrong. 1. I\'m doing something wr

Question

This is in Java, I don't know what I'm doing wrong.

1. I'm doing something wrong with Integer.parseInt

package writefiles;

import java.io.*;

public class Courses implements Serializable {

    private String title;

    private String prefixNumber;

    private String timeDay;

    private int sectionNumber;

    private int creditHours;

    public Courses(String title, String prefixNumber, String timeDay, int sectionNumber, int creditHours){

        this.title = title;

        this.prefixNumber = prefixNumber;

        this.timeDay = timeDay;

        this.sectionNumber = sectionNumber;

        this.creditHours = creditHours;

    }

    public Courses() {

        setTitle("");

        setPrefixNumber("");

        setTimeDay("");

        setSectionNumber(0);

        setCreditHours(0);

    }

    public String getTitle() {

        return title;

    }

    public String getPrefixNumber() {

        return prefixNumber;

    }

    public String getTimeDay() {

        return timeDay;

    }

    public int getSectionNumber() {

        return sectionNumber;

    }

    public int getCreditHours() {

        return creditHours;

    }

    public void setTitle(String title) {

        this.title = title;

    }

    public void setPrefixNumber(String prefixNumber) {

        this.prefixNumber = prefixNumber;

    }

    public void setTimeDay(String timeDay) {

        this.timeDay = timeDay;

    }

    public void setSectionNumber(int sectionNumber) {

        this.sectionNumber = sectionNumber;

    }

    public void setCreditHours(int creditHours) {

        this.creditHours = creditHours;

    }

    @Override

    public String toString() {

        return "Courses{" + "title=" + title + ", prefixNumber=" + prefixNumber + ", timeDay=" + timeDay + ", sectionNumber=" + sectionNumber + ", creditHours=" + creditHours + '}';

    }

}

***********************************************************************************************

/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package writefiles;

import java.util.*;

import java.io.*;
import javax.swing.*;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;

public class WriteFiles {
  
private static Formatter output;
private static Scanner input;
  
public static void main(String[] args) {
  
ArrayList coursesList = new ArrayList();
writeTextFile();
readTextFile(coursesList);
  
for (Courses c: coursesList){
System.out.println(c.toString());
}
  
writeSerFile(coursesList);
readSerFile();
  
}
  
public static void writeTextFile(){
  
try
{
output = new Formatter("courses.txt");
output.format("%s;%d;%.2f%n","Python", "INSY 3300", "560-650 MW", 1, 3);
output.format("%s;%d;%.2f%n","Networking", "INSY 3303", "530-650 TR", 1, 3);
output.format("%s;%d;%.2f%n","DBMS", "INSY 3304", "900-950 MWF", 1, 3);
output.format("%s;%d;%.2f%n","Analysis&Design", "INSY 3305", "700-820 TR", 1, 3);
output.format("%s;%d;%.2f%n","Java I", "INSY 4305", "700-820 TR", 1, 3);
output.format("%s;%d;%.2f%n","Java II", "INSY 4306", "530-650 TR", 1, 3);
output.format("%s;%d;%.2f%n","Mobile App", "INSY 4308", "200-320 TR", 1, 3);
output.format("%s;%d;%.2f%n","Web Development", "INSY 4315", "1000-1050 MWF", 1, 3);
output.format("%s;%d;%.2f%n","Resource Management", "INSY 4325", "100-220 TR", 1, 3);
}
  
catch(IOException ioe){
ioe.printStackTrace();
}
}
  
public static void readTextFile(ArrayList coursesList){
  
String line;
String values[];
  
try{
input = new Scanner(getFile());
  
while(input.hasNext())
{
line = input.nextLine();
values = line.split(";");
  
coursesList.add(new Courses(values[0],
coursesList.add(new Courses(values[1],
coursesList.add(new Courses(values[2],
Integer.parseInt(values[3],
Integer.parseInt(values[4])));
}
}
  
catch (IOException ioe){
ioe.printStackTrace();
}
  
}
  
public static void writeSerFile(ArrayListcoursesList){
ObjectOutputStream output;
  
try{
output = new ObjectOutputStream(new FileOutputStream("courses.ser"));
  
for (Courses c: coursesList){
output.writeObject(c);
}
}
  
catch(IOException ioe){
ioe.printStackTrace();
}
}
  
public static void readSerFile(){
ObjectInputStream input;
Courses obj;
  
try{
input = new ObjectInputStream(new FileInputStream(getFile()));
  
while(true){
obj = (Courses)input.readObject();
System.out.println(obj.toString());
}
}
catch(EOFException eof){
  
}
  
catch(ClassNotFoundException cnfe){
cnfe.printStackTrace();
}
  
catch(IOException ioe){
ioe.printStackTrace();
}
}

public static File getFile()
{
JFileChooser fileChooser = new JFileChooser();
  
fileChooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
int result = fileChooser.showOpenDialog(null);
if (result == JFileChooser.CANCEL_OPTION){
System.exit(1);
}
  
File fileName = fileChooser.getSelectedFile();
  
if ((fileName == null) || (fileName.getName().equals(""))){
JOptionPane.showMessageDialog(null, "Invalid Option",
"Invalid Option", JOptionPane.ERROR_MESSAGE);
  
System.exit(1);
}
return fileName;
}
  
}

Explanation / Answer

Try the following changes in this block of code:

try{
input = new Scanner(getFile());
  
while(input.hasNext())
{
line = input.nextLine();
values = line.split(";");
  
coursesList.add(new Courses(values[0],values[1],values[2],Integer.parseInt(values[3]),Integer.parseInt(values[4]));
}
}

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