I'm pretty sure buttonPanel and BorderLayout are part of the swing package.. yet it cant be found? 

code for kgtolb.java:

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class kgtolb extends JFrame{
private converter w = new converter();
private JLabel kgLabel = new JLabel("Kilograms");
private JLabel lbLabel = new JLabel("Pounds");
private JTextField kgField = new JTextField("0.0");
private JTextField lbField = new JTextField("0.0");
private JButton kgButton = new JButton("Convert >>>>>");
private JButton lbButton = new JButton("Convert <<<<<");

public kgtolb() {
JPanel dataPanel = new JPanel(new GridLayout(2,2,12,6));
dataPanel.add(kgLabel);
dataPanel.add(lbLabel);
dataPanel.add(kgField);
dataPanel.add(lbField);
JPanel buttonPane1 = new JPanel();
buttonPanel.add(kgButton);
buttonPanel.add(lbButton);
Container container = getContentPane();
container.add(dataPanel, borderLayout.CENTER);
kgButton.addActionListener(new kgListener());
lbButton.addActionListener(new lbListener());
}
private class kgListener implements ActionListener{
public void actionPerformed(ActionEvent e) {
String input = kgField.getText();
w.setkg(Double.parseDouble(input));
double kg = w.getkg();
kgField.setText(" ",kg);
}
}
private class lbListener implements ActionListener{
public void actionPerformed(ActionEvent e) {
String input = lbField.getText();
w.setlb(Double.parseDouble(input));
double lb = w.getlb();
lbField.setText(" ",lb);
}
}
public static void main(String[]args){
kgtolb GUI = new kgtolb();
GUI.setTitle("Pounds to Kilograms converter");
GUI.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
GUI.pack();
GUI.setVisible(true);
}
}

here is the converter.java file:

public class converter {

private double weightLB;
private double weightKG;

public converter() {
}
public void setkg(double lb)
{
double weightKG = (double)lb/2.2;
}
public void setlb(double kg)
{
double weightLB = (double)kg*2.2;
}
public double getkg(){
return weightKG;
}
public double getlb(){
return weightLB;
}
}

/*lbs / 2.2 = kilograms
 *kg x  2.2 = pounds
 */

here is the build output:


--------------------Configuration: <Default>--------------------
E:\adv. comp sci\kgtolb.java:21: cannot find symbol
symbol  : variable buttonPanel
location: class kgtolb
buttonPanel.add(kgButton);
^
E:\adv. comp sci\kgtolb.java:22: cannot find symbol
symbol  : variable buttonPanel
location: class kgtolb
buttonPanel.add(lbButton);
^
E:\adv. comp sci\kgtolb.java:24: cannot find symbol
symbol  : variable borderLayout
location: class kgtolb
container.add(dataPanel, borderLayout.CENTER);
                         ^
E:\adv. comp sci\kgtolb.java:33: setText(java.lang.String) in javax.swing.text.JTextComponent cannot be applied to (java.lang.String,double)
kgField.setText(" ",kg);
       ^
E:\adv. comp sci\kgtolb.java:41: setText(java.lang.String) in javax.swing.text.JTextComponent cannot be applied to (java.lang.String,double)
lbField.setText(" ",lb);
       ^
5 errors

Process completed.

Although I know it may not convert right, im just looking for it to work so I can make it convert properly once I see it work.

ok, but what about the buttonPanel one?

edit: ..and the setText one also

hmm it says setText(java.lang.String) in javax.swing.text.JTextComponent cannot be applied to (java.lang.String,double)
(minus the bold)
so that means it accepts 2 arguments. Also it worked on the code my teacher gave me when it was used in that format :s

edit: man this is the 2nd time recently ive been getting an overly weird error.. the last time my teacher actually had to analyze it on her own computer during class!

ohhhhhhh your right, it does have the + on my paper. I'll edit this to let you know if that worked

edit: that did it 

but..  that buttonPanel.. 

edit: what class is buttonPanel found in?

OOOOOOOOhhhhhhh! Now I got it. Heh.. turns out I put JPanel buttonPane1 instead of buttonPanel. now it works. Thanks!

Ok this time it just won't convert period. I tried 5 in the kilograms field to convert to pounds but it didn't work and just put '0.0' in the pounds text field

here is the updated code and updated converter.java file

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class kgtolb extends JFrame{
private converter w = new converter();
private JLabel kgLabel = new JLabel("Kilograms");
private JLabel lbLabel = new JLabel("Pounds");
private JTextField kgField = new JTextField("");
private JTextField lbField = new JTextField("");
private JButton kgButton = new JButton("Convert >>>>>");
private JButton lbButton = new JButton("Convert <<<<<");

public kgtolb() {
JPanel dataPanel = new JPanel(new GridLayout(2,2,12,6));
dataPanel.add(kgLabel);
dataPanel.add(lbLabel);
dataPanel.add(kgField);
dataPanel.add(lbField);
JPanel buttonPanel = new JPanel();
buttonPanel.add(kgButton);
buttonPanel.add(lbButton);
Container container = getContentPane();
container.add(dataPanel, BorderLayout.CENTER);
container.add(buttonPanel, BorderLayout.SOUTH);
kgButton.addActionListener(new kgListener());
lbButton.addActionListener(new lbListener());
}
private class kgListener implements ActionListener{
public void actionPerformed(ActionEvent e) {
String input = kgField.getText();
double kginput = Double.parseDouble(input);
w.setlb(kginput);
double lb = w.getlb();
lbField.setText(""+ lb);
}
}
private class lbListener implements ActionListener{
public void actionPerformed(ActionEvent e) {
String input = lbField.getText();
double lbinput = Double.parseDouble(input);
w.setkg(lbinput);
double lb = w.getlb();
kgField.setText(""+ lb);
}
}
public static void main(String[]args){
kgtolb GUI = new kgtolb();
GUI.setTitle("Pounds to Kilograms converter");
GUI.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
GUI.pack();
GUI.setVisible(true);
}
}

converter.java
public class converter {

private double weightLB;
private double weightKG;

public converter() {
}
public void setkg(double kg)
{
double weightKG = (double)kg/2.2;
}
public void setlb(double lb)
{
double weightLB = (double)lb*2.2;
}
public double getlb(){
return weightLB;
}
public double getkg(){
return weightKG;
}
}

/*lbs / 2.2 = kilograms
 *kg x  2.2 = pounds
 */


:s it still outputs '0.0' when you enter a number in the lb input field and convert it to kg

yeah, I suppose so. Thanks for helping me!

..now to work on my moon phases assignment