Contoh Program GUI dengan Konsep PBO

Berikut ini screenshoot program :

Tampilan menu utama dengan 4 tombol

Ketika tombol 1 ditekan menampilkan form isian yang akan dicetak dan ditampilkan dengan JOptionpane

Ketika tombol 2 ditekan menampilkan form perhitungan sederhana

Ketika tombol 3 ditekan menampilkan form dengan menampilkan lingkaran 5 warna

Ketika tombol 4 ditekan akan menampilkan sebuah pesan dan keluar dari program

Source code simpan dengan nama file Modul4.java

import java.awt.Color;

import java.awt.Graphics;

import javax.swing.JFrame;

import javax.swing.JPanel;

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

class FrameMain extends JFrame implements ActionListener {//Inheritance

private JButton tombol1, tombol2, tombol3, tombol4;//Information hiding

public FrameMain(){

super ("PRAKTIKUM PBO"); //implementasi SUPER

Container c = getContentPane();

c.setLayout(null);

tombol1 = new JButton("1");

tombol1.setLocation(0,0);

tombol1.setSize(100,350);

tombol1.setBackground(Color.red);

tombol2 = new JButton("2");

tombol2.setLocation(100,0);

tombol2.setSize(100,350);

tombol2.setBackground(Color.yellow);

tombol3 = new JButton("3");

tombol3.setLocation(200,0);

tombol3.setSize(100,350);

tombol3.setBackground(Color.blue);

tombol4 = new JButton("4");

tombol4.setLocation(300,0);

tombol4.setSize(100,350);

tombol4.setBackground(Color.green);

tombol1.addActionListener(this);

tombol2.addActionListener(this);

tombol3.addActionListener(this);

tombol4.addActionListener(this);

c.add(tombol1);

c.add(tombol2);

c.add(tombol3);

c.add(tombol4);

setSize(410,350);

setLocation(400,200);

setVisible (true);

}

public void actionPerformed (ActionEvent en){

if (en.getSource() == tombol1){

setVisible(false);

FrameFirst fs = new FrameFirst();

fs.setVisible(true);

}

else if (en.getSource() == tombol2){

setVisible(false);

FrameSecond fd = new FrameSecond();

fd.setVisible(true);

}

else if (en.getSource() == tombol3){

setVisible(false);

FrameThird ft = new FrameThird();

ft.setVisible(true);

}

else if (en.getSource() == tombol4){

FrameFourth fe = new FrameFourth();

fe.tmplFrame();

}

}

}

class FrameFirst extends JFrame implements ActionListener{//Inheritance

private JButton tombol1;

    private JLabel labelnama, labelnpm, labelkls;

    private JTextField txtnama, txtnpm, txtkls;

public FrameFirst(){

super ("BUTTON 1");

Container c = getContentPane();

c.setLayout(null);

labelnama = new JLabel("Nama  :");

labelnama.setLocation(10,10);

labelnama.setSize(labelnama.getPreferredSize());

txtnama = new JTextField();

txtnama.setLocation(70,10);

txtnama.setSize(300,20);

labelnpm = new JLabel("NPM    :");

labelnpm.setLocation(10,30);

txtnpm = new JTextField();

txtnpm.setLocation(70,30);

txtnpm.setSize(300,20);

labelnpm.setSize(labelnama.getPreferredSize());

labelkls = new JLabel("Kelas  :");

labelkls.setLocation(10,50);

labelkls.setSize(labelnama.getPreferredSize());

txtkls = new JTextField();

txtkls.setLocation(70,50);

txtkls.setSize(300,20);

tombol1 = new JButton("OK");

tombol1.setLocation(10,100);

tombol1.setSize(80,20);

tombol1.addActionListener(this);

c.add(tombol1);

c.add(labelnama);

c.add(txtnama);

c.add(labelnpm);

c.add(txtnpm);

c.add(labelkls);

c.add(txtkls);

setSize(410,350);

setLocation(400,200);

setVisible (true);

}

public void actionPerformed (ActionEvent en){

if (en.getSource() == tombol1){

String nama = txtnama.getText();

        String npm = txtnpm.getText();

        String kls = txtkls.getText();

        JOptionPane.showMessageDialog(null,"Nama : "+nama+"\nNpm : "+npm+"\nKelas : "+kls);

        setVisible(false);

FrameMain fo = new FrameMain();

fo.setVisible(true);

}

}

}

class FrameSecond extends JFrame implements ActionListener{

private JButton tombol1, tombol2, tombol3;//information hiding

    private JLabel labelalas, labeltinggi, labelhasil;//information hiding

    private JTextField txtalas, txttinggi, txthasil;//information hiding

public FrameSecond(){

super ("BUTTON 2");//SUPER

Container c = getContentPane();

c.setLayout(null);

labelalas = new JLabel("Alas");

labelalas.setLocation(10,10);

labelalas.setSize(labelalas.getPreferredSize());

txtalas = new JTextField();

txtalas.setLocation(70,10);

txtalas.setSize(300,20);

labeltinggi = new JLabel("Tinggi");

labeltinggi.setLocation(10,30);

labeltinggi.setSize(labeltinggi.getPreferredSize());

txttinggi = new JTextField();

txttinggi.setLocation(70,30);

txttinggi.setSize(300,20);

tombol1 = new JButton("Hitung");

tombol1.setLocation(10,60);

tombol1.setSize(80,25);

tombol1.addActionListener(this);

tombol2 = new JButton("Reset");

tombol2.setLocation(150,60);

tombol2.setSize(80,25);

tombol2.addActionListener(this);

tombol3 = new JButton("Close");

tombol3.setLocation(290,60);

tombol3.setSize(80,25);

tombol3.addActionListener(this);

labelhasil = new JLabel("Hasil");

labelhasil.setLocation(10,100);

labelhasil.setSize(labelhasil.getPreferredSize());

txthasil = new JTextField();

txthasil.setLocation(70,100);

txthasil.setSize(300,20);

c.add(tombol1);

c.add(tombol2);

c.add(tombol3);

c.add(labelalas);

c.add(txtalas);

c.add(labeltinggi);

c.add(txttinggi);

c.add(labelhasil);

c.add(txthasil);

setSize(410,350);

setLocation(400,200);

setVisible (true);

}

public void actionPerformed (ActionEvent en){

if (en.getSource() == tombol1){

try{

double alas = Double.parseDouble(txtalas.getText());

        double tinggi = Double.parseDouble(txttinggi.getText());

        double hasil = 0.5 * alas * tinggi;

        txthasil.setText(""+hasil);

}

catch (Exception e){//Implementasi Exception

if(txtalas.getText().equals("")&&txttinggi.getText().equals("")){

JOptionPane.showMessageDialog(null,"Angka Tidak boleh kosong, harus diisi !");

            txtalas.setText("");

            txttinggi.setText("");

}

else{

JOptionPane.showMessageDialog(null,"Inputan harus Angka");

            txtalas.setText("");

            txttinggi.setText("");

}

}

}

if (en.getSource() == tombol2){

txtalas.setText("");

txthasil.setText("");

txttinggi.setText("");

}

if (en.getSource() == tombol3){

setVisible(false);

FrameMain fo = new FrameMain();

fo.setVisible(true);

}

}

}

class FrameThird extends JFrame implements ActionListener{

private JButton tombol1;

    private JLabel labelnama, labelnpm, labelkls;

public FrameThird(){

super ("BUTTON 3");

Container c = getContentPane();

c.setLayout(null);

DrawPanel draw=new DrawPanel();

Panel panel = new Panel();

panel.setLocation(0,0);

panel.setSize(200,350);

panel.setLayout(new GridLayout(1,1));

panel.add(draw);

tombol1 = new JButton("Close");

tombol1.setLocation(200,0);

tombol1.setSize(200,350);

tombol1.addActionListener(this);

c.add(tombol1);

c.add(panel);

        

setSize(410,350);

setLocation(400,200);

setVisible (true);

}

public void actionPerformed (ActionEvent en){

if (en.getSource() == tombol1){

setVisible(false);

FrameMain fo = new FrameMain();

fo.setVisible(true);

}

}

}

class DrawPanel extends JPanel{//menampilkan lingkaran pada button 3

@Override

public void paintComponent(Graphics g){

g.setColor(Color.WHITE);

            g.fillRect(0,0, this.getWidth(), this.getHeight());

            

            g.setColor(Color.red);

            g.fillOval(110,90,30,30);

            

            g.setColor(Color.blue);

            g.fillOval(80,130,30,30);

            

            g.setColor(Color.green);

            g.fillOval(140,130,30,30);

            

            g.setColor(Color.yellow);

            g.fillOval(90,175,30,30);

            

            g.setColor(Color.pink);

            g.fillOval(130,175,30,30);

}

}

class FrameFourth{

public void tmplFrame(){

JOptionPane.showMessageDialog(null,"Terima Kasih sudah menggunakan aplikasi ini");

System.exit(0);

}

}

public class Modul4 {

    

    public static void main(String[] args) {

    FrameMain fo = new FrameMain();

fo.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }

}

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