Hi Guys,
I'm new to Java and hoping someone can help me with this code.
I started to work on this exercise to create a calculator app, and Im really stuck on two things:
1. NumberFormatExeption - NetBeans IDE keep show me this error:
}catch(NumberFormatExeption e){
required: Throwable
found: NumberFormatExeption
2. I can't figure it out how to assign the values from JTextField num1, num2 to double numbe1 and number2
Here is the code, the part Im struggling with is marked with stars:
Thanks in advance,
package calculator;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
public class Calculator extends JFrame {
//declaring the variables
JButton add, substract, multiply, devide, squere, avarage;
JTextField num1, num2;
JLabel resoult, enter1, enter2;
//constructor
public Calculator(){
setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
//enter first number
enter1 = new JLabel("1st: ");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 0;
add(enter1, c);
num1 = new JTextField(16);
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 1;
c.gridy = 0;
c.gridwidth = 3;
add(num1, c);
//enter second number
enter2 = new JLabel("2nd ");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 1;
c.gridwidth = 8;
add(enter2, c);
num2 = new JTextField(16);
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 1;
c.gridy = 1;
c.gridwidth = 8;
add(num2, c);
add = new JButton("+");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 1;
c.gridy = 2;
c.gridwidth = 1;
add(add, c);
substract = new JButton("-");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 2;
c.gridy = 2;
add(substract, c);
multiply = new JButton("*");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 1;
c.gridy = 3;
add(multiply, c);
devide = new JButton("/");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 2;
c.gridy = 3;
add(devide, c);
squere = new JButton("Sq");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 3;
c.gridy = 2;
add(squere, c);
avarage = new JButton("Av");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 3;
c.gridy = 3;
add(avarage, c);
resoult = new JLabel(" ");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 1;
c.gridy = 5;
c.gridwidth = 8;
add(resoult, c);
event callogic = new event();
add.addActionListener(callogic);
substract.addActionListener(callogic);
multiply.addActionListener(callogic);
devide.addActionListener(callogic);
squere.addActionListener(callogic);
avarage.addActionListener(callogic);
}
public class event implements ActionListener{
@Override
public void actionPerformed(ActionEvent callogic){
/ * double number1 = 0 , number2 = 0; //Complirer set them to zero by
// default
//I can figure out how to assign
//values from num1 and num2
* try{
* number1 = Double.parseDouble(num1.getText());
* }catch(NumberFormatExeption e){
* resoult.setText("Illigal data 1st field");
* }
* try{
* number2 = Double.parseDouble(num2.getText());
* }catch(NumberFormatExeption e){
* resoult.setText("Illigal data 2nd field");
}*/
String op = callogic.getActionCommand();
if(op.equals("+")){
double sum = number1 + number2;
resoult.setText(number1 + " + " + number2 + " = " + sum);
}
else if(op.equals("-")){
double difference = number1 + number2;
resoult.setText(number1 + " - " + number2 + " = " + difference);
}
else if(op.equals("*")){
double multiplication = number1 * number2;
resoult.setText(number1 + " * " + number2 + " = " + multiplication);
}
else if(op.equals("Sq")){
double sque = number1 * number1;
resoult.setText(number1 + "To Squere = " + sque);
}
else if(op.equals("Av")){
double avar = number1 + number2 / 2;
resoult.setText("The Avarage = " + avar);
}
else if(op.equals("/")){
if(number2 == 0){
resoult.setText("Cannot devide by zero");
}else{
double division = number1 / number2;
resoult.setText(number1 + " / " + number2 + " = " + division);
}
}
}
cezar84 0 Newbie Poster
radhakrishna.p 29 Posting Whiz in Training
mostly this exception will also comes with if you are passing empty string to Double.parseDouble("") method ( i mean while caliculating the result)
for finding this place s.o.p statements(to know what values are stored in those variables i mean num1.getText() & num2.getText()) before you are caliculating the results
try once that
i think **this is also one reason for getting that kind of exception every time **
happy coding
yours
radha krishna
radhakrishna.p 29 Posting Whiz in Training
go thru the post (its also a calicuator application)
http://www.daniweb.com/software-development/java/threads/440520/unexpected-end-of-line
check out there modified code once
happy coding
yours
radha krishna
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