import java.awt.BorderLayout;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import javax.swing.JComboBox;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.text.DecimalFormat;



public class opdracht extends JFrame {

    private JPanel contentPane;
    private JTextField txtBedrag;
    private JTextField txtAntwoord;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    opdracht frame = new opdracht();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public opdracht() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 450, 300);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);

        JLabel lblBedragInEuros = new JLabel("bedrag in euros");
        lblBedragInEuros.setBounds(10, 11, 147, 14);
        contentPane.add(lblBedragInEuros);

        txtBedrag = new JTextField();
        txtBedrag.setBounds(199, 8, 86, 20);
        contentPane.add(txtBedrag);
        txtBedrag.setColumns(10);

        JLabel lblError = new JLabel("   ");
        lblError.setBounds(189, 11, 46, 14);
        contentPane.add(lblError);

        final JComboBox ddlValuta = new JComboBox();
        ddlValuta.setModel(new DefaultComboBoxModel(new String[] {"dollar", "engelse pond", "yen"}));
        ddlValuta.setBounds(10, 57, 112, 20);
        contentPane.add(ddlValuta);

        txtAntwoord = new JTextField();
        txtAntwoord.setEditable(false);
        txtAntwoord.setBounds(146, 57, 86, 20);
        contentPane.add(txtAntwoord);
        txtAntwoord.setColumns(10);

        JButton btnBerekenen = new JButton("berekenen");
        btnBerekenen.addActionListener(new ActionListener() {
            final DecimalFormat format = new DecimalFormat("#######################################.00");
            public void actionPerformed(ActionEvent arg0) {
                try{
                    if (ddlValuta.getSelectedItem() == "dollar"){
                        String Antwoord = txtBedrag.getText();
                        double Ant = Double.valueOf(Antwoord);
                        Ant = Ant * 0.700624;
                        Antwoord = "$ "+String.valueOf(format.format(Ant));
                        txtAntwoord.setText(Antwoord);
                    }
                    else if (ddlValuta.getSelectedItem() == "engelse pond"){
                        String Antwoord = txtBedrag.getText();
                        double Ant = Double.valueOf(Antwoord);
                        Ant = Ant * 1.119319;
                        Antwoord = "\u00a3 "+String.valueOf(format.format(Ant));
                        txtAntwoord.setText(Antwoord);
                    }
                    else if (ddlValuta.getSelectedItem() == "yen"){
                        String Antwoord = txtBedrag.getText();
                        double Ant = Double.valueOf(Antwoord);
                        Ant = Ant * 0.007499;
                        Antwoord = "\u00a5 "+String.valueOf(format.format(Ant));
                        txtAntwoord.setText(Antwoord);
                    }
                }
                catch(NumberFormatException nfe){
                    JOptionPane.showMessageDialog(null, "Er moet een getal worden ingevuld.");
                }
            }
        });
        btnBerekenen.setBounds(10, 103, 89, 23);
        contentPane.add(btnBerekenen);


    }
}