"Exception in thread "main" java.lang.NullPointerException".
Hi,
I installed jdk1.6.0_13 and Eclipse Release 3.4.2 this morning. But when I tried to run my first program I got error
"Exception in thread "main" java.lang.NullPointerException".
I run actually the same program on my laptop without any problem.
Do you have any idea?
Thanks in advance.
Suude-j
Sorry, I forgot enclosed codes:
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JRadioButton;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.JComponent;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import javax.swing.text.PlainDocument;
import java.text.DecimalFormat;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.KeyEvent;
import java.lang.Math;
import java.awt.Toolkit;
import java.awt.Image;
class DoubleTextDocument extends PlainDocument
{ public void insertString(int offs, String str,
AttributeSet a)
throws BadLocationException
{ if (str == null) return;
String oldString = getText(0, getLength());
String newString = oldString.substring(0, offs)
+ str + oldString.substring(offs);
try
{
if (Double.parseDouble(newString ) < 100) {
int i = newString.lastIndexOf(".");
int j = newString.lastIndexOf(",");
int l = newString.length();
if (( i < 0 || l <= i+2 )||(j < 0 || l <= j+2))
super.insertString(offs, str, a);
}
}
catch(NumberFormatException e)
{
}
}
}
class DoubleTextField extends JTextField
{ public DoubleTextField( int size)
{ super("", size);
}
protected Document createDefaultModel()
{ return new DoubleTextDocument();
}
public boolean isValid()
{ try
{ Integer.parseInt(getText());
return true;
}
catch(NumberFormatException e)
{ return false;
}
}
public double getValue()
{ try
{
if (getText() == "") return 0;
return Double.parseDouble(getText());
}
catch(NumberFormatException e)
{ return 0;
}
}
}
public class test implements ActionListener {
private JFrame frame;
private JLabel tablForm;
private JRadioButton tablFormC;
private JRadioButton tablFormFR;
private JRadioButton tablFormR;
private JRadioButton tablFormFF;
private JLabel maxTjocklek;
private JLabel maxBredd;
private JLabel maxLängd;
private DoubleTextField maxTjocklekField;
private DoubleTextField maxBreddField;
private DoubleTextField maxLängdField;
private JTextField kodField;
private JButton kodButton;
public static void main(String[] args) {
test mgr = new test();
}
public test(){
frame = new JFrame();
frame.setTitle("Kassett Kods Förslag");
frame.setLayout(new BorderLayout());
frame.setVisible(true);
//Border
BorderLayout layout = new BorderLayout(10,10);
frame.setLayout(layout);
//North Panel
JPanel northPanel = new JPanel();
northPanel.setLayout(new GridLayout(5,1));
tablForm = new JLabel("Tabletts Form:");
tablFormC = new JRadioButton("C", false);
tablFormFR = new JRadioButton("FR", true);
tablFormR = new JRadioButton("R", false);
tablFormFF = new JRadioButton("FF", false);
ButtonGroup bGroup = new ButtonGroup();
bGroup.add(tablFormC);
bGroup.add(tablFormFR);
bGroup.add(tablFormR);
bGroup.add(tablFormFF);
northPanel.add(tablForm);
northPanel.add(tablFormFR);
northPanel.add(tablFormR);
northPanel.add(tablFormFF);
northPanel.add(tablFormC);
tablFormFR.addActionListener(this);
// tablFormFR.addKeyListener(this);
tablFormR.addActionListener(this);
// tablFormR.addKeyListener(this);
tablFormFF.addActionListener(this);
// tablFormFF.addKeyListener(this);
tablFormC.addActionListener(this);
// tablFormC.addKeyListener(this);
//West Panel
JPanel westPanel = new JPanel();
westPanel.setLayout(new GridLayout(3,2));
maxTjocklek = new JLabel("MaxTjocklek");
maxTjocklekField = new DoubleTextField(3);
maxBredd = new JLabel("MaxBredd");
maxBreddField = new DoubleTextField (3);
maxLängd = new JLabel("MaxLängd");
maxLängdField = new DoubleTextField (3);
maxLängdField.disable();
westPanel.add(maxTjocklek);
westPanel.add(maxTjocklekField);
westPanel.add(maxBredd);
westPanel.add(maxBreddField);
westPanel.add(maxLängd);
westPanel.add(maxLängdField);
//South Panel
JPanel southPanel = new JPanel();
southPanel.setLayout(new GridLayout(1,2));
kodButton = new JButton("Kod");
kodField = new JTextField (13);
southPanel.add(kodButton);
southPanel.add(kodField);
kodButton.addActionListener(this);
//Frame
frame.add(northPanel, BorderLayout.NORTH);
frame.add(westPanel, BorderLayout.WEST);
frame.add(southPanel, BorderLayout.SOUTH);
frame.pack();
Toolkit tk = Toolkit.getDefaultToolkit();
Dimension d = tk.getScreenSize();
int screenHeith = d.height;
int screenWidth = d.width;
frame.setSize(screenWidth / 3, screenHeith / 3);
frame.setLocation(screenWidth / 5, screenHeith / 5);
Image img = tk.getImage("icon.gif");
frame.setIconImage(img);
}
public void KeyListener(KeyEvent e) {
int key = e.getKeyCode();
if (key == KeyEvent.VK_ENTER) {
e.setKeyCode(KeyEvent.VK_TAB);
}
}
public void KeyPressed(KeyEvent e){}
public void KeyReleased(KeyEvent e) {}
public void KeyTyped(KeyEvent e) {}
public void actionPerformed(ActionEvent e) {
Object source = e.getSource();
if (tablFormFR.isSelected() || tablFormR.isSelected() || tablFormFF.isSelected()) {
maxLängdFieldDisable();
}
else{
maxBreddFieldDisable();
}
if (source == kodButton) {
codeSearching();
}
}
private void maxLängdFieldDisable(){
maxLängdField.setText("");
maxLängdField.disable();
maxBreddField.enable();
maxTjocklek.setNextFocusableComponent(maxBreddFiel d);
}
private void maxBreddFieldDisable(){
maxBreddField.setText("");
maxBreddField.disable();
maxLängdField.enable();
maxTjocklek.setNextFocusableComponent(maxLängdFiel d);
}
private void codeSearching(){
if(tablFormC.isSelected()){
double tjocklek = maxTjocklekField.getValue();
double lengd = maxLängdField.getValue();
if( (tjocklek > 3.9 && tjocklek < 5.0) && (lengd > 10.9 && lengd < 12.1)){
kodField.setText("O5 4B80");
}
else if( (tjocklek > 4.9 && tjocklek < 5.6) && (lengd > 12.9 && lengd < 15.4)){
kodField.setText("Q4 6B90");
}
else if( (tjocklek > 5.4 && tjocklek < 6.1) && (lengd > 15.4 && lengd < 16.2)){
kodField.setText("R3 6B100");
}
else if( (tjocklek > 5.2 && tjocklek < 6.1) && (lengd > 15.2 && lengd < 17.0)){
kodField.setText("S3 7B100");
}
else if( (tjocklek > 5.9 && tjocklek < 6.6) && (lengd > 16.9 && lengd < 18.0)){
kodField.setText("T2 7B110");
}
else if( (tjocklek > 6.4 && tjocklek < 7.1) && (lengd > 17.9 && lengd < 20.0)){
kodField.setText("W1 8C110");
}
else if( (tjocklek > 6.4 && tjocklek < 7.1) && (lengd > 19.9 && lengd < 21.0)){
kodField.setText("X1 9C110");
}
else if( (tjocklek > 7.4 && tjocklek < 8.1) && (lengd > 20.9 && lengd < 22.1)){
kodField.setText("Z0 9D120");
}
else if( (tjocklek > 7.4 && tjocklek < 8.1) && (lengd > 20.9 && lengd < 23.5)){
kodField.setText("Z0 9C120");
}
else {
kodField.setText("Finns ej!");
}
}
else {
double tjocklek = maxTjocklekField.getValue();
double bredd = maxBreddField.getValue();
if (tjocklek < 1.8 || tjocklek > 8.3 || bredd < 5.1 || bredd > 14.1) {
kodField.setText("Finns Ej!");
return;
}
int n = 0;
int m = 0;
m = Math.min(Math.max(((int) Math.ceil(((bredd - 5.1) * 2 ))) +1,1),19);
if(tablFormFR.isSelected()){
n = Math.min(Math.max(((int) Math.ceil(((tjocklek - 2) * 4))) +1,1),26);
}
else if(tablFormR.isSelected()) {
n = Math.min(Math.max(((int) Math.ceil(((tjocklek - 1.8) * 4))) +1,1),26);
}
/* else{
if ()
}*/
// A = 64
char hjulbokstav = (char) (n+64);
int hjulnr = 55 + m*5;
int fonster;
if (m < 3) { fonster = 1;}
else if (m > 2 && m < 7) { fonster = 2;}
else if (m > 6 && m < 11) { fonster = 3;}
else if (m > 10 && m < 15){fonster = 4;}
else { fonster = 5;}
//else { fonster = ((int) (m-2) /4) + 2;}
char fordelare;
if (n < 6) { fordelare = 'A';}
else if (n < 13) { fordelare = 'B';}
else if (n < 21) { fordelare = 'C';}
else { fordelare = 'D';}
int pip = ((int) ((double) m -1)/2) * 10 + 75;
if ( pip > 145) { pip = 155;}
String result;
result = String.format("%s%d %d%s%d S", hjulbokstav, hjulnr, fonster, fordelare, pip);
if (result.equals("G60 1B75 S")){result = "H60 1B75 S";}
else if (result.equals("Q145 5C155 S")){result = "R145 5C155 S";}
else if (result.equals("U125 4D135 S")){result = "V125 4D135 S";}
else if ((n==1 && m>5)||(n==2 && m>6)||(n==3 && m>7)||(n==4 && m>7)||
(n==5 && m>9)||(n==6 && m>9)||(n==7 && m>11)||(n==8 && m>14)||
(n==9 && m>15)||(n==10 && m>15)||(n==11 && m>15)
||(n==9 && m<2)||(n==10 && m<3)||(n==11 && m<3)||(n==12 && m<5)
||(n==13 && m<5)||(n==14 && m<5)||(n==15 && m<6)||(n==16 && m<7)
||(n==17 && m<7)||(n==18 && m<7)||(n==19 && m<7)||(n==20 && m<7)
||(n==21 && m<7)||(n==22 && m<12)||(n==23 && m<12)||(n==24 && m<12)
||(n==25 && m<12)||(n==26 && m<12))
{result="Finns Ej!";}
kodField.setText(result);}
}
}
|
Exception in thread "main" java.lang.NullPointerException
Linear Mode
