Pemrograman Berorientasi Objek Lanjut Lecture 01 - Introduction

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N I K O I B R A H I M , M I T

P R O G R A M S T U D I S I S T E M I N F O R M A S I F A K U L T A S T E K N O L O G I I N F O R M A S I U N I V E R S I T A S K R I S T E N M A R A N A T H A

Pemrograman Berorientasi Objek

Lanjut

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Tujuan Perkuliahan PBO Lanjut

1. Mahasiswa mampu membuat program aplikasi

Java berdasarkan konsep objek oriented.

2. Mahasiwa mampu membuat program aplikasi yang

berhubungan dengan database.

3. Mahasiswa memahami konsep-konsep lanjutan

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Rules

 Pedoman Perkuliahan

 Titip absen  E

 Handphone wajib di-nonaktifkan/silent

 Menggunakan pakaian rapi & bersepatu

 Kewajiban hadir:

 Kehadiran > 15 menit, tidak boleh masuk kelas

 75% kehadiran dosen (<= 25% berarti cekal)

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Pedoman Penilaian

 NA= 30% UTS + 30% UAS + 15% Quiz + 25%

Praktikum  Penghitungan nilai:  A: 80 <= NA <= 100  B+: 73 <= NA < 80  B: 67 <= NA < 73  C+: 61 <= NA < 67  C: 55 <= NA < 61  D: 41 <= NA < 55  E: NA <41

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Materi Keseluruhan

 Java Swing

 Komponen-komponen Swing  Layout Manager

 Event-driven programming

 Generics & Collections  File & Stream processing

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Jadwal Kuliah

Session Lectures

Materials

Session 01 Pengenalan OOP Lanjut & Swing

Session 02 Komponen-komponen Swing Dasar 1

Session 03 Komponen-komponen Swing Dasar 2

Session 04 Layout Manager

Session 05 Event-Driven Programming

Session 06 NetBeans GUI Builder Tutorial

UTS

Session 07 Java Collection Framework

Session 08 Database & JDBC

Session 09 Database & JDBC

Session 10 Database & Java Persistence API (JPA)

Session 11 Database & Java Persistence API (JPA)

Session 12 Presentasi Tugas

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Details of Assessable Work in The Topic

No Details about each form of

assessable work in the topic Amount

Proportion of total mark

Penalties to be applied for plagiarism 1 Programming tasks 10 20% Mark = 0, for all

practical works

2 Quizzes 5 10% Mark = 0, for all

quizzes

3 Assignments 2 10% Mark = 0

4 Mid-semester Exam 1 25% Mark = 0, for all exams 5 Final-semester Exam 1 25% Mark = 0, for all exams

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Reading Materials

1. INTRODUCTION TO JAVA PROGRAMMING, 10th

Ed., Y. Daniel Liang

2. Learning Java, Jonathan Knudsen & Patrick

Niemeyer, O’Reilly, 2005. (Main Reading Materials)

3. Java Swing, Matthew Robinson & Pavel Vorobiev,

Manning, 2005.

4. Java API Documentation, Sun Microsystems 5. NetBeans Tutorials and Documentations

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Softwares and Tools

 JDK 1.7 + Java API Documentation

 Editors:

 JGrasp (Simple Java editor, free download)  NetBeans 7 (Java IDE, free download)

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Got Any Problems?

 Ask directly after the class! (preferable)

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Review: HelloMe.java

0: // Exercise 1: HelloMe.java

1: // NIK: 730015, NAMA: Niko Ibrahim 2: public class HelloMe {

3: public static void main (String args[ ]) {

4: System.out.println("Hello World, Niko!");

5: }

6: }

Line 0: Komentar program, judul program, keterangan penting. Line 1: Selalu tuliskan identitas penulis program.

Line 2: - Nama kelas. Setiap program Java minimal memiliki 1 deklarasi kelas. - Kelas diawali huruf kapital untuk setiap kata.

- Untuk men-save public class ke file, harus diberi nama sesuai dengan nama kelas

tsb dan diakhiri dengan ekstensi .java. Tentang public akan dibahas nanti.

Line 3: main method  the starting point of every Java application

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Review OOP

public class SegiEmpat extends Shape{

private int tinggi;

private int lebar;

public SegiEmpat(int h, int w){ this.tinggi = h;

this.lebar = w; }

public int luas (){ return h*w;

}

public static void main (String args[ ]) { SegiEmpat s = new SegiEmpat(3,4);

System.out.println("Luas: " + s.luas()); } } Property -->private Constructor -->public, no returned value Method --> public

Belongs to the object/instance

Static Method Belongs to the class

Interitance: copying property/method of

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•J A V A A W T V S J A V A S W I N G

•K O M P O N E N - K O M P O N E N D A S A R S W I N G •L A T I H A N

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3 hal penting dalam pemrograman GUI

1. Elemen-elemen (components) apa yang bisa

ditampilkan di layar?

2. Bagaimana cara kira menyusun dan

menempatkan elemen-elemen tersebut?

3. Bagaimana kita berinteraksi dengan

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No 1. Components

 Parts of GUI: buttons, menus, checkboxes, sliders,

text fields, labels, and so on.

 API provides numerous implementations

 We can create own custom components

frame button radio button checkbox label

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No 2. Layouts

 Susunan komponen di layar:

 Absolute: x, y coordinates specified for each component (rarely used)

 Relative with respect to other component positions/sizes, screen resolution,

fonts used etc.

 Layout Managers (objects) are used to deal with

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No 3. Event Handling

 A technique to deal with user input  Event-based model:

1. button clicked (by user)

2. event generated (by the system)

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Java Solution: Swing

 Untuk melakukan GUI Programming, Java

menyediakan 2 libraries:

 AWT (Abstract Window Toolkit), and  Swing

 AWT - an old library, present in the first Java

release,

 Swing - an improved library added later

 Swing does not replace AWT , it builds on top of

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AWT vs Swing

 AWT components are heavyweight

 peer-based, platform-dependant implementation (in native

code).

 Difficult to port, platform-dependant look.

 Swing components are pure Java applications  lightweight - do not use peers

 Pluggable look-and-feel - platform-independant, programmer

designed look (system independent).

 Whenever possible Swing components should be

used

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AWT vs Swing (2)

 Highest level components are heavy

 Each light one has a corresponding heavy one,

somewhere in the hierarchy (a background to draw onto):

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Java API (JavaDoc)

 Sebagai programmer, JAVA API adalah suatu

dokumen yang wajib dimiliki.

 Semua class & method (termasuk untuk Java Swing)

ada di dalam dokumen ini!

 Dokumentasi, Tutorial, Contoh-contoh (termasuk

aplikasi Swing):

 http://www.netbeans.org/kb/index.html  http://docs.oracle.com/javase/7/docs/api/

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Komponen Swing Dasar

 JFrame

 JPanel  JLabel  JButton

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Frame

 The top-level component for most Swing-based

applications is called a frame and is defined by the

JFrame class.

 By itself, a frame doesn’t do much.

 But to do anything else in Swing, you must first

create a frame.

 The figure shows a frame that does nothing but

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Exercise 01: HelloFrame.java

import javax.swing.*;

public class HelloFrame extends JFrame {

/** Creates a new instance of HelloFrame */

public HelloFrame() {

this.setSize(200,100);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setTitle("Hello World!");

this.setVisible(true);

}

public static void main(String[] args) { new HelloFrame();

} }

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Positioning the Frame On-Screen

 If you want to place the frame at some arbitrary

location on-screen, use the setLocation method.

 Example: frame.setLocation(0,0);

 If you want to center the frame on-screen, call the

setLocationRelativeTo method and pass null as the parameter:

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JLabel

 A label is a component that simply displays text.  Labels are used for a variety of purposes:

 to display captions for other controls such as text fields or combo

boxes,

 to display informational messages, or

 to show the results of a calculation or a database lookup.

 A label can also display an image, or it can display both

an image and some text. And we have complete control over the appearance of the text

 We can specify the font, size, whether the text is bold,

italic, or underlined, what color the text is displayed as, and so on.

 Example:

JLabel label1 = new JLabel(); label1.setText("Hello, World!"); or

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JButton

 Next to labels, the Swing component you use most

is the JButton component, which creates a button the user can click.

 Example:

JButton button1 = new JButton("Click me!");

or

JButton button1 = new JButton();

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JPanel

 A panel is a type of container that’s designed to hold a

group of components so they can be displayed on a frame.

 The normal way to display a group of controls such as

text fields, labels, buttons, and other GUI widgets is to add those controls to a panel, and then add the panel to the frame.

 Example:

class HelloPanel extends JPanel{ public HelloPanel(){

JLabel label1 = new JLabel("Hello, World!"); JButton button1 = new JButton("Click me!");

} }

 Then, in the frame class contstructor, we create a new

instance of the panel class and add it to the frame: frame.add(new HelloPanel());

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Putting it all together

Exercise 02: HelloFrame2.java

import javax.swing.*;

public class HelloFrame2 extends JFrame { /** Creates a new instance of HelloFrame */

public HelloFrame2() {

this.setSize(200,100);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setTitle("Hello World!");

HelloPanel panel1 = new HelloPanel(); this.add(panel1);

this.setVisible(true);

this.setLocationRelativeTo(null); // set location to the center

}

class HelloPanel extends JPanel{

public HelloPanel(){

// code to add components to the panel goes here

JLabel label1 = new JLabel("Hello, this is label!"); this.add(label1);

JButton button1 = new JButton("Click me!"); this.add(button1);

} }

public static void main(String[] args) { new HelloFrame2();

} }

FULL CODE: Copy & paste the codes into JGrasp

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Y O U ’ V E L E A R N E D : •R E V I E W O O P : • class, • object/instance, • property, • method, • constructor •I N T R O D U C T I O N T O S W I N G :

• JFrame, JPanel, JLabel, JButton

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S K I M M I N G J A V A D O C 7

P R A K T I K U M 0 1 – P E N G E N A L A N J A V A S W I N G

To Do Today

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T O D O T H I S W E E K : • _{R e a d : J a v a R e v i e w  D i k t a t O O P L , P a g e 1 2 5} • _{R e a d : J a v a s w i n g 2 , O ’ R e i l l y ( c h a p t e r 1 )} • _{R u n t h e D e m o ‘ S w i n g S e t 2 . j a r ’} • _{S t u d y t h e s o u r c e c o d e o f ‘ S w i n g S e t 2 ’} • _{G o t o} h t t p : / / j a v a . s u n . c o m / d o c s / b o o k s / t u t o r i a l / u i s w i n g /

Pemrograman Berorientasi Objek Lanjut Lecture 01 - Introduction