| Bug I cant Figure Out [message #1064093] |
Mon, 17 June 2013 15:22  |
 Matthew Marion
Messages: 1
Registered: June 2013 |
Junior Member |
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Hello! I recently just started java coding. I read a few tutorials on how to do basic things, such as hello world and other things. I tried to take it up a notch and i followed a calculator tutorial. I did everything, but whenever i click RUN, i get an error. Here is the code please help! 
calculator.java
code:
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.MouseInfo;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
public class Calculator extends JFrame {
public JButton addButton;
public JButton subtractButton;
public JButton multiplyButton;
public JButton divideButton;
public JTextField firstNumber;
public JTextField secondNumber;
public JTextField thirdNumber;
public JTextField answer;
public JLabel answerLabel;
public Calculator () {
this.setTitle("Calculator by Omar S.");
this.setSize(new Dimension(250, 190));
this.setLocation(MouseInfo.getPointerInfo().getLocation());
this.setLayout(new FlowLayout());
this.setResizable(false);
this.addComponentListener(new ComponentListener() {
@OverRide
public void componentHidden(ComponentEvent arg0) {}
@Override
public void componentMoved(ComponentEvent arg0) {}
@Override
public void componentResized(ComponentEvent arg0) {}
@Override
public void componentShown(ComponentEvent arg0) {
Calculator_Load();
}
});
this.addButton = new JButton();
this.addButton.setText("Add");
this.addButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
addButton_ActionPerformed();
}
});
this.subtractButton = new JButton();
this.subtractButton.setText("Subtract");
this.subtractButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
subtractButton_ActionPerformed();
}
});
this.multiplyButton = new JButton();
this.multiplyButton.setText("Multiply");
this.multiplyButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
multiplyButton_ActionPerformed();
}
});
this.divideButton = new JButton();
this.divideButton.setText("Divide");
this.divideButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
divideButton_Actionperformed();
}
});
this.firstNumber = new JTextField();
this.firstNumber.setText(" ");
this.secondNumber = new JTextField();
this.secondNumber.setText(" ");
this.answer = new JTextField();
this.answer.setText(" ");
this.answer.setEditable(false);
this.answerLabel = new JLabel();
this.answerLabel.setText("Answer: ");
add(addButton);
add(subtractButton);
add(multiplyButton);
add(divideButton);
add(firstNumber);
add(secondNumber);
add(answerLabel);
add(answer);
}
private void Calculator_Load(){
firstNumber.setText("");
secondNumber.setText("");
answer.setText("");
}
private void addButton_ActionPerformed(){
try{
int num1, num2;
num1 = Integer.parseInt(firstNumber.getText());
num2 = Integer.parseInt(secondNumber.getText());
int answer2 = num1+num2;
answer.setText(String.valueOf(answer2));
}catch(Exception ex){
JOptionPane.showMessageDialog(null, "Invalid Numbers");
}
}
private void subtractButton_ActionPerformed(){
try{
int num1, num2;
num1 = Integer.parseInt(firstNumber.getText());
num2 = Integer.parseInt(secondNumber.getText());
int answer2 = num1-num2;
answer.setText(String.valueOf(answer2));
}catch(Exception ex){
JOptionPane.showMessageDialog(null, "Invalid Numbers");
}
}
private void multiplyButton_ActionPerformed(){
try{
int num1, num2;
num1 = Integer.parseInt(firstNumber.getText());
num2 = Integer.parseInt(secondNumber.getText());
int answer2 = num1*num2;
answer.setText(String.valueOf(answer2));
}catch(Exception ex){
JOptionPane.showMessageDialog(null, "Invalid Numbers");
}
}
private void divideButton_Actionperformed(){
try{
int num1, num2;
num1 = Integer.parseInt(firstNumber.getText());
num2 = Integer.parseInt(secondNumber.getText());
int answer2 = num1/num2;
answer.setText(String.valueOf(answer2));
}catch(Exception ex){
JOptionPane.showMessageDialog(null, "Invalid Numbers");
}
}
}
main.java
code:
public class Main {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Calculator newform = new Calculator();
newform.setVisible(true);
}
}
OverRide.java
code:
public @interface OverRide {
}
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