Metric System to U.S. System - GUI Application in Java

GuyZ,
   It was the Java App Dev question in Esperanza'13 event.
I would like to share the application I developed there. But there are some difference from application I created there. I have added more graphics here.

Download Link: http://www.2shared.com/file/gJCpjGGb/MetriceConversion_In_Java.html

/* * * Coded by Ajith Kp [ http://www.terminalcoders.blogspot.in ] * * (c) _TERMINAL_CODERS_ (c) * */ package metriceconversion; import java.awt.*; import java.awt.event.*; import javax.swing.*; public class MetriceConversion extends JFrame { JPanel gPanel, rPanel, superPanel; JTextField fld; JComboBox box; JButton button; JLabel show, y, i, m, f, yr, ir, mr, fr; String[] cmb = {"CM", "M", "KM"}; float num; float yard, inch, mile, feet; String met; public MetriceConversion() { super("Metrice Converter"); gPanel = new JPanel(new GridLayout(1, 4, 5, 5)); rPanel = new JPanel(new GridLayout(4, 2, 5, 5)); superPanel = new JPanel(new FlowLayout()); show = new JLabel("Enter Length: "); gPanel.add(show); fld = new JTextField(10); gPanel.add(fld); box = new JComboBox(cmb); gPanel.add(box); button = new JButton("Submit"); gPanel.add(button); superPanel.add(gPanel); y = new JLabel(); i = new JLabel(); m = new JLabel(); f = new JLabel(); y.setForeground(Color.RED); i.setForeground(Color.GREEN); m.setForeground(Color.CYAN); f.setForeground(Color.MAGENTA); button.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent evt) { try { num = (float) Float.parseFloat(fld.getText()); met = box.getSelectedItem().toString(); calculate(num, met); } catch(Exception ex) { JOptionPane.showMessageDialog(null, "Error: "+ex.getMessage(), "Error", JOptionPane.ERROR_MESSAGE); } } }); yr = new JLabel(); ir = new JLabel(); mr = new JLabel(); fr = new JLabel(); yr.setForeground(Color.RED); ir.setForeground(Color.GREEN); mr.setForeground(Color.CYAN); fr.setForeground(Color.MAGENTA); i.setFont(new Font("Algerian", Font.BOLD+Font.ITALIC, 20)); y.setFont(new Font("Algerian", Font.BOLD+Font.ITALIC, 20)); m.setFont(new Font("Algerian", Font.BOLD+Font.ITALIC, 20)); f.setFont(new Font("Algerian", Font.BOLD+Font.ITALIC, 20)); ir.setFont(new Font("Algerian", Font.BOLD, 20)); yr.setFont(new Font("Algerian", Font.BOLD, 20)); mr.setFont(new Font("Algerian", Font.BOLD, 20)); fr.setFont(new Font("Algerian", Font.BOLD, 20)); show.setFont(new Font("Algerian", Font.BOLD+Font.ITALIC, 15)); rPanel.add(i); rPanel.add(ir); rPanel.add(f); rPanel.add(fr); rPanel.add(y); rPanel.add(yr); rPanel.add(m); rPanel.add(mr); superPanel.add(rPanel); gPanel.setBackground(Color.WHITE); rPanel.setBackground(Color.WHITE); superPanel.setBackground(Color.WHITE); add(superPanel); } void calculate(float n, String t) { switch(t.toLowerCase()) { case "cm": yard = (float) ((float) n/91.44); inch = (float) ((float) n/2.54); mile = (float) ((float) n/160934.4); feet = (float) ((float) n/30.48); showMetrice(); break; case "m": yard = (float) ((float) n*100/91.44); inch = (float) ((float) n*100/2.54); mile = (float) ((float) n*100/160934.4); feet = (float) ((float) n*100/30.48); showMetrice(); break; case "km": yard = (float) ((float) n*1000*100/91.44); inch = (float) ((float) n*1000*100/2.54); mile = (float) ((float) n*1000*100/160934.4); feet = (float) ((float) n*1000*100/30.48); showMetrice(); break; } } void showMetrice() { y.setText("Yard: "); i.setText("Inch: "); m.setText("Mile: "); f.setText("Feet: "); yr.setText(String.valueOf(yard)); ir.setText(String.valueOf(inch)); mr.setText(String.valueOf(mile)); fr.setText(String.valueOf(feet)); } public static void main(String[] args) { MetriceConversion mc = new MetriceConversion(); mc.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); mc.setSize(550, 200); mc.setVisible(true); } }