# GUI and how to convert a distance

i need help..
how to create a GUI application that can be is used to convert a distance unit in miles into its corresponding units in kilometer, meter, inches and centimeter. When a user enters a mile value in a text field and followed by pressing a button, its equivalent values in unit of kilometer, meter, inches and centimeter will be displayed in the corresponding text fields. If the user enters the value of miles that is less or equals to zero, a dialogue error message that contains a message ?The value must be greater than zero? will be displayed.
The formula for each of unit conversion is as follows:
1 mile = 2.5 km
1 km = 1000 m
1 meter = 60 inches
1 inches = 2.54 m

--------
i'm use netbeans soffware..

March 15, 2010 at 5:31 PM

Hi Friend,

Through the following values, we have converted miles into different units.
1 mile=1.609344, 1 meter=39.3700787 inches and 1 inch=0.0254 meter.

Try the following:

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.util.regex.*;
import java.text.*;

class ConvertMile extends JFrame{
JTextField t1,t2,t3,t4,t5;
JLabel l1,l2, l3, l4, l5;
JPanel p,p1,p2;
JButton b;
ConvertMile(){
p=new JPanel(new GridLayout(6,2));
p1=new JPanel(new GridLayout(2,2));
p2=new JPanel(new GridLayout(4,2));
t1=new JTextField(20);
t2=new JTextField(20);
t3=new JTextField(20);
t4=new JTextField(20);
t5=new JTextField(20);
l1=new JLabel("Enter distance( in Miles)");
l2=new JLabel("In KM");
l3=new JLabel("In M");
l4=new JLabel("In Inches");
l5=new JLabel("In CM");
b=new JButton("Convert");
public void keyTyped(KeyEvent e) {
String input=t1.getText();
Pattern p = Pattern.compile("[A-Z,a-z,&%\$#@!()*^]");
Matcher m = p.matcher(input);
if (m.find()) {
}
}
});
public void actionPerformed(ActionEvent e){
String value=t1.getText();
double distance=Double.parseDouble(value);
if(distance<=0){
JOptionPane.showMessageDialog(null,"The value must be greater than zero");
}
else{
double km=distance * 1.609344;
double m=km * 1000;
double cm=m * 100;
double inch=m * 39.3700787;
DecimalFormat f = new DecimalFormat("##.### ");
t2.setText(f.format(km)+" KM");
t3.setText(f.format(m)+" M");
t4.setText(f.format(inch)+" Inches");
t5.setText(f.format(cm)+" CM");

}
}
});

setVisible(true);
pack();
}
public static void main(String[] args)
{

ConvertMile m=new ConvertMile();
}
}
Thanks

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