Program Java-GUI 1

PROGRAM JAVA BERBASIS GUI 1 (Perhitungan Faktorial)

import javax.swing.*;

import java.awt.event.*;

import java.awt.*;

class GUIfak extends JFrame implements ActionListener

{

double hasil;

Container con = new Container();

JButton hapus, ok;

JTextField tex1, tex2;

double fakt(double angka)

{

if(angka == 0)

{

return 1;

}

else

{

return angka*fakt(angka-1);

}

}

public GUIfak()

{

super("PROGRAM FAKTORIAL");

setSize (300,250);

ok = new JButton ("Faktorial");

hapus = new JButton ("Hapus");

ok.addActionListener (this);

hapus.addActionListener (this);

JPanel tombol = new JPanel ();

hapus.setEnabled (false);

tombol.setLayout (new GridLayout(1,2,10,10));

tombol.add (hapus);

tombol.add(ok);

tex1 = new JTextField("");

tex2 = new JTextField("");

tex2.setEditable (false);

JPanel tex = new JPanel();

tex.setLayout(new GridLayout (2,1,10,10));

tex.add(tex1);

tex.add(tex2);

con = getContentPane();

con.setLayout(null);

tex.setBounds(100,80,100,50);

tombol.setBounds(50,150,200,30);

con.add(tombol);

con.add(tex);

show();

}

public void actionPerformed (ActionEvent e)

{

try

{

if (e.getSource()==ok)

{

hapus.setEnabled(true);

double angka = Double.parseDouble(tex1.getText());

hasil = fakt(angka);

}

tex2.setText(Double.toString(hasil));

if (e.getSource() == hapus)

{

tex1.setText("");

tex2.setText("");

hapus.setEnabled(false);

}

}

catch(Exception ex)

{

hapus.setEnabled(false);

JOptionPane.showMessageDialog(this, "Masukkan nilai yang benar..!!");

}

}

public static void main(String[] args)

{

GUIfak q = new GUIfak();

q.setResizable(false);

q.setDefaultCloseOperation(EXIT_ON_CLOSE);

}

}