I need help centering the label and making the "Temperature", "Distance", and "Exit" buttons the same size. import java.

[answerhappygod]

I need help centering the label and making the "Temperature", "Distance", and "Exit" buttons the same size.
import java.awt.*;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JOptionPane;import java.awt.event.ActionListener;import java.awt.event.ActionEvent;
public class GUI {
public static class Converter{
// attribute private double input;
// default constructor with no parameter which sets input //to Double.NaN [Not a Number] Converter(){ this.input = Double.NaN; }
// overloaded constructor with input for parameter Converter(double input){ this.input = input; }
// get and set methods double getInput() { return this.input; } public void setInput(double input) { this.input = input; }
// method convert() to return input value double convert() { return this.input; }
}// end Converter
public static class TemperatureConverter extends Converter{
// constructs that call parent constructor TemperatureConverter(){ super(); }
TemperatureConverter(double input){ super(input); }
/* overridden convert() method to convert Fahrenheit to Celsius *and return value; if the instance has no input or not a number, *it should return Double.NaN */ double convert() { if(super.getInput() == Double.NaN) { return Double.NaN; } else { return((super.getInput() - 32) * 5)/9; } }
}// end TemperatureConverter
public static class DistanceConverter extends Converter{
// constructors that call parent constructor DistanceConverter(){ super(); }
DistanceConverter(double input){ super(input); }
/* overridden convert() method to convert input (distance in miles) * to distance(km) and return value; if the instance has no input *or not a number, it should return Double.NaN **/ double convert() { if(super.getInput() == Double.NaN) { return Double.NaN; } else { return super.getInput() * 1.609; } }
}// end DistanceConverter
public static class GUIConverter extends Converter{
GUIConverter(){
// implement GUIConverter class JFrame frame = new JFrame("Converter"); JPanel panel = new JPanel(); // set label JLabel label1 = new JLabel("Please select which converter you woud like:"); label1.setHorizontalTextPosition(JLabel.CENTER); // GUI buttons JButton distance = new JButton("Distance"); JButton temperature = new JButton("Temperature"); JButton exit = new JButton("Exit"); GridBagLayout layout = new GridBagLayout(); panel.setLayout(layout); GridBagConstraints window = new GridBagConstraints(); window.insets = new Insets(10, 10, 10, 10); // add constraints on specific buttons window.fill = GridBagConstraints.HORIZONTAL; window.gridx = 0; window.gridy = 0; panel.add(label1, window); window.fill = GridBagConstraints.HORIZONTAL; window.gridx = 0; window.gridy = 1; panel.add(distance, window);
window.gridx = 1; window.gridy = 1; panel.add(temperature, window);
window.gridx = 0; window.gridy = 2; window.fill = GridBagConstraints.HORIZONTAL; window.gridwidth = 2; panel.add(exit, window);
// set size and layout of frame frame.add(panel); frame.setLayout(new GridBagLayout()); frame.setSize(500, 160); frame.setLocationRelativeTo(null); frame.setVisible(true); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // terminate program when user closes GUI
// add action listener to buttons; allows user to input value after // Distance Converter button is selected and get converted result distance.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { // store input String str = JOptionPane.showInputDialog("Input distance in miles to" + " convert to kilometers: "); double miles = Double.parseDouble(str); // conversion to double
// instance creation of DistanceConverter object using miles DistanceConverter obj = new DistanceConverter(miles); // call convert() of object and display result JOptionPane.showMessageDialog(frame, miles + " miles equals " + obj.convert()+ " kilometers."); } }); // allows user to input value when Temperature button is selected and // returns converted result temperature.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { // store input string String str = JOptionPane.showInputDialog("Input Fahrenheit temp to" + " convert to Celsius: "); double fahren = Double.parseDouble(str); // conversion to double // instance creation of TemperatureConverter object TemperatureConverter obj = new TemperatureConverter(fahren); JOptionPane.showMessageDialog(frame, fahren + " F equals " + obj.convert() + "C."); } }); // program terminates when user clicks Exit exit.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { frame.dispose(); // dispose frame } }); }
public static void main(String[] args) {
// call constructor to create GUI new GUIConverter(); } }}