I've an error that i can't let disappear

Question

I want to read some data in from a text but i get an error now:
C:\testnetbeens\test\src\meting\TestFrame.java:122: unreported exception java.io.IOException; must be caught or declared to be thrown
data.add(new WeersMeting(date, city, temp));
TestFrame.java
package meting;
import meting.model.WeersMetingen;
import meting.model.WeersMeting;
import meting.view.JTableFrame;
import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
public class TestFrame extends JFrame   {
    private JButton verslagButton;
    private JButton tabelButton;
    private JButton grafiekButton;
    private JPanel keuzePanel;
    private Font font;
    private Border border;
    private JFrame newFrame;
    private String date;
    private String city;
    private String temp;
     public TestFrame(String titel) throws IOException {
         super(titel);
         init();
         maakKeuzePanel();
         maakFrame();
         voegListenersToe();
         try    {
         String line;
         File inFile = new File("data.dat");
         FileReader fileReader = new FileReader(inFile);
         BufferedReader bufReader = new BufferedReader(fileReader);
         line =  bufReader.readLine();
         String[] elements= line.split(" ");
         String date= elements[0];
         String city= elements[1];
         String temp= elements[2];
         bufReader.close();
         catch (IOException e)  {
         Label tekstLabel = new Label();
         tekstLabel.setAlignment(Label.CENTER);
         tekstLabel.setFont(font);
         tekstLabel.setText("ONT8");
         add(tekstLabel);
         toonFrame();
     public void init()    {
         font = new Font("Sans Serif",Font.PLAIN,14);
         border = BorderFactory.createEtchedBorder(
                 EtchedBorder.RAISED, Color.blue, Color.black);
     private void maakKeuzePanel()    {
         keuzePanel = new JPanel();
         keuzePanel.setBorder(border);
         keuzePanel.setBorder(BorderFactory.createTitledBorder(border, "MAAK UW KEUZE"));
         ImageIcon icon = new ImageIcon("grafiek.gif");
         ImageIcon iconOver = new ImageIcon("images.gif");
         verslagButton = new JButton("Verslag");
         verslagButton.setHorizontalAlignment(SwingConstants.CENTER);
         verslagButton.setHorizontalTextPosition(SwingConstants.CENTER);
         verslagButton.setVerticalTextPosition(SwingConstants.BOTTOM);
         verslagButton.setFont(font);
         verslagButton.setMnemonic(KeyEvent.VK_V); //ALT-V
         verslagButton.setActionCommand("toonVerslag");
         //verslagButton.setEnabled(false);
         tabelButton = new JButton("Tabellen");
         tabelButton.setHorizontalAlignment(SwingConstants.CENTER);
         tabelButton.setHorizontalTextPosition(SwingConstants.CENTER);
         tabelButton.setVerticalTextPosition(SwingConstants.BOTTOM);
         tabelButton.setFont(font);
         tabelButton.setMnemonic(KeyEvent.VK_T); //ALT-T
         tabelButton.setActionCommand("toonTabel");
         //tabelButton.setEnabled(false);
         grafiekButton = new JButton("Grafiek", icon);
         grafiekButton.setRolloverIcon(iconOver);
         grafiekButton.setHorizontalAlignment(SwingConstants.CENTER);
         grafiekButton.setHorizontalTextPosition(SwingConstants.CENTER);
         grafiekButton.setVerticalTextPosition(SwingConstants.BOTTOM);
         grafiekButton.setFont(font);
         grafiekButton.setMnemonic(KeyEvent.VK_G); //ALT-T
         grafiekButton.setActionCommand("toonGrafiek");
         //grafiekButton.setEnabled(false);
         keuzePanel.add(verslagButton);
         keuzePanel.add(tabelButton);
         keuzePanel.add(grafiekButton);
     private void maakFrame()    {
         Container pane = getContentPane();
         pane.add(keuzePanel, BorderLayout.SOUTH);
     private void voegListenersToe()    {
         verslagButton.addActionListener(new ActionListener()   {
             public void actionPerformed(ActionEvent e) {
                 if (e.getActionCommand() == "toonVerslag") {
                     new VerslagFrame("tabel");
         tabelButton.addActionListener(new ActionListener()   {
            public void actionPerformed(ActionEvent e) {
                if (e.getActionCommand() == "toonTabel") {
                     WeersMetingen data = new WeersMetingen();
                     data.add(new WeersMeting(date, city, temp));
                     new JTableFrame(data);
         grafiekButton.addActionListener(new ActionListener()   {
             public void actionPerformed(ActionEvent e) {
                 if (e.getActionCommand() == "toonGrafiek") {
                     new GrafiekFrame("grafiek");
     private void toonFrame()   {
         setSize(450,280);
         Dimension d = getToolkit().getScreenSize();
         setLocation((d.width-getSize().width)/2,(d.height-getSize().height)/2);
         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         pack();
         setVisible(true);
}main.java
package meting;
import meting.model.WeersMetingen;
import meting.model.WeersMeting;
import meting.view.JTableFrame;
* AWT Sample application
* @author
* @version 1.00 06/07/20
public class Main {
public static void main(String[] args) {
// Create application frame.
new TestFrame("OPDRACHT ONT8");
grafiekFrame.java
package meting;
import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
public class GrafiekFrame extends JFrame {
private Font font;
private Border border;
public GrafiekFrame(String titel) {
super(titel);
//init();
Label tekstLabel = new Label();
tekstLabel.setAlignment(Label.CENTER);
tekstLabel.setFont(font);
tekstLabel.setText("grafiek");
add(tekstLabel);
toonFrame();
//private void init() {
// font = new Font("Sans Serif",Font.PLAIN,14);
// border = BorderFactory.createEtchedBorder(
// EtchedBorder.RAISED, Color.blue, Color.black);
private void toonFrame() {
setSize(450,280);
Dimension d = getToolkit().getScreenSize();
setLocation((d.width-getSize().width)/2,(d.height-getSize().height)/2);
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
pack();
setVisible(true);
}VerslagFrame.java
package meting;
import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
public class VerslagFrame extends JFrame {
private Font font;
private Border border;
public VerslagFrame(String titel) {
super(titel);
//init();
Label tekstLabel = new Label();
tekstLabel.setAlignment(Label.CENTER);
tekstLabel.setFont(font);
tekstLabel.setText("Verslag");
add(tekstLabel);
toonFrame();
//private void init() {
// font = new Font("Sans Serif",Font.PLAIN,14);
// border = BorderFactory.createEtchedBorder(
// EtchedBorder.RAISED, Color.blue, Color.black);
private void toonFrame() {
setSize(450,280);
Dimension d = getToolkit().getScreenSize();
setLocation((d.width-getSize().width)/2,(d.height-getSize().height)/2);
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
pack();
setVisible(true);
}WeersMeting.java
package meting.model;
public class WeersMeting {
private String datum;
private String plaats;
private String temp;
public WeersMeting (String datum, String plaats, String temp) {
this.datum = datum;
this.plaats = plaats;
this.temp = temp;
public String getDatum() {
return datum;
public String getPlaats() {
return plaats;
public String getTemp() {
return temp;
}JTableFrame.java
package meting.view;
import meting.model.WeersMeting;
import meting.model.WeersMetingen;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableColumnModel;
import java.awt.*;
import java.util.List;
import java.util.Vector;
import java.io.Serializable;
public class JTableFrame extends JFrame {
private static final String[] koppen = {"Datum", "Plaats", "Temp"};
private DefaultTableModel model;
private JTable table;
private DefaultTableModel model1;
private JTable table1;
private JButton toevoegButton;
private JButton verwijderButton;
private JButton temp_ifv_tijdButton;
public JTableFrame(WeersMetingen weersmetingen) {
super("Metingen");
maakComponenten();
vulTable(weersmetingen.getData());
stelKolomBreedtesIn();
voegListenersToe();
maakLayout();
toonFrame();
private void maakComponenten() {
model = new DefaultTableModel();
table = new JTable(model) {
public Dimension getPreferredScrollableViewportSize() {
return getPreferredSize();
table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
toevoegButton = new JButton("Voeg een meting toe");
verwijderButton = new JButton("Verwijder meting");
temp_ifv_tijdButton = new JButton("temp ifv tijd");
private void vulTable(List<WeersMeting> data) {
for (int i= 0; i < koppen.length; i++) {
model.addColumn(koppen);
Vector<Serializable> rijData;
for(WeersMeting weersmeting : data) {
rijData = new Vector<Serializable>();
rijData.add(weersmeting.getDatum());
rijData.add(weersmeting.getPlaats());
rijData.add(weersmeting.getTemp());
model.addRow(rijData);
private void stelKolomBreedtesIn() {
TableColumnModel columnModel = table.getColumnModel();
columnModel.getColumn(0).setMinWidth(70);
columnModel.getColumn(0).setMaxWidth(70);
columnModel.getColumn(1).setMinWidth(70);
columnModel.getColumn(1).setMaxWidth(100);
columnModel.getColumn(2).setMinWidth(40);
columnModel.getColumn(2).setMaxWidth(40);
private void voegListenersToe() {
toevoegButton.addActionListener( new ToevoegListener(table, model));
verwijderButton.addActionListener( new VerwijderListener(table, model));
temp_ifv_tijdButton.addActionListener(new Temp_Ifv_TijdListener());
private void maakLayout() {
JPanel panel1 = new JPanel();
panel1.add(toevoegButton);
panel1.add(verwijderButton);
JPanel panel2 = new JPanel();
panel2.add(temp_ifv_tijdButton);
JScrollPane scrollPane = new JScrollPane(table);
scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
Container content = getContentPane();
content.add(scrollPane, BorderLayout.PAGE_START);
content.add(panel1, BorderLayout.CENTER);
content.add(panel2, BorderLayout.PAGE_END);
private void toonFrame() {
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
setLocation(0,0);
pack();
setVisible(true);
}[\code]
WeersMetingen.javapackage meting.model;
import java.util.List;
import java.util.ArrayList;
import java.util.Collections;
public class WeersMetingen {
private List<WeersMeting> data = new ArrayList<WeersMeting>();
public WeersMetingen() {
public WeersMetingen(List<WeersMeting> data) {
this.data = data;
public List<WeersMeting> getData() {
return Collections.unmodifiableList(data);
public WeersMeting getElementAt(int index) {
return data.get(index);
public void add(WeersMeting weersmeting) {
data.add(weersmeting);
public boolean remove(WeersMeting weersmeting) {
return data.remove(weersmeting);
ToevoegListener.java
package meting.view;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Vector;
import java.io.Serializable;
public class ToevoegListener implements ActionListener {
private JTable table;
private DefaultTableModel model;
public ToevoegListener(JTable table, DefaultTableModel model) {
this.table = table;
this.model = model;
public void actionPerformed(ActionEvent e) {
int rowIndex = table.getSelectedRow();
Vector<Serializable> vector = new Vector<Serializable>();
vector.add("Datum");
vector.add("Plaats");
vector.add("Temp");
if (rowIndex != -1) {
model.insertRow(rowIndex, vector);
} else {
model.addRow(vector);
}VerwijderListener.java
package meting.view;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class VerwijderListener implements ActionListener {
private JTable table;
private DefaultTableModel model;
public VerwijderListener(JTable table, DefaultTableModel model) {
this.table = table;
this.model = model;
public void actionPerformed(ActionEvent e) {
int rowIndex = table.getSelectedRow();
if (rowIndex != -1) {
model.removeRow(rowIndex);
}Temp_Ifv_TijdListener.java
package meting.view;
import meting.model.WeersMetingen;
import meting.model.WeersMeting;
import meting.view.JTableFrameTemp_Datum;
import meting.TestFrame;
import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.table.DefaultTableModel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class Temp_Ifv_TijdListener implements ActionListener {
public Temp_Ifv_TijdListener() {
public void actionPerformed(ActionEvent e) {
}my data-file should look like: (data.dat)
12/06/2006 Lanaken +31
13/06/2006 Lanaken +16
14/06/2006 Lanaken +0
15/06/2006 Lanaken -5
16/06/2006 Lanaken +16
17/06/2006 Lanaken +14

Answer 1

im not reading that novel you posted but id suggest 2 common sense things to you:
1 - READ THE ERROR FOR THE LOVE OF GOD
2 - perhaps there is an "unreported exception java.io.IOException;"
that maybe "must be caught or declared to be thrown" and maybe its on line ":122" ?
wrap a try catch block around any IO
try{
IO
}catch(Exception e){}