jgs CSE 205 Object-Oriented Programming and Data Structures Lecture 10: Java Swing Dr. Javier Gonzalez-Sanchez [email protected] javiergs.engineering.asu.edu | javiergs.com PERALTA 230U Office Hours: By appointment 

jgs Previously … Polymorphism 

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 3 jgs The Class Object § The Object class is a special class defined in the java.lang package. § All classes are derived from the Object class. 

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 4 jgs Conversions 

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 5 jgs getClass 

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 6 jgs getClass 

jgs Test Yourselves Polymorphism 

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 8 jgs Test Yourselves 

jgs Note Java Programming for Assignment 01 

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 10 jgs The toString Method 

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 11 jgs The toString Method § The toString method is a method that takes no parameter and returns a string § A returned string usually contains information on instance variables of its class. § Each class has a default toString method that contains its class object name and hash number. § When an object is used with System.out.println method, its toString method will be called. 

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 12 jgs The toString Method 

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 13 jgs java.Util.Scanner 

jgs Graphical User Interfaces GUI 

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 15 jgs Java API 

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 16 jgs A Frame import javax.swing.*; public class Example extends JFrame{ public Example() { super("Hello World Swing"); } public static void main(String[] args) { Example frame = new Example(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(500,500); frame.setVisible(true); } } 

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 17 jgs Widgets import javax.swing.*; public class Example extends JFrame{ public Example() { super("Hello World Swing"); JLabel label = new JLabel("Hello World"); add(label); } public static void main(String[] args) { Example frame = new Example(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(500,500); frame.setVisible(true); } } 

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 18 jgs Widgets import javax.swing.*; public class Example extends JFrame{ public Example() { super("Hello World Swing"); FlowLayout layout = new FlowLayout(); setLayout(layout); JLabel label = new JLabel("Hello World"); add(label); JButton button = new JButton("Click Me"); add(button); JTextField text = new JTextField("Text", 10); add(text); JCheckBox check = new JCheckBox("Option"); add(check); } public static void main(String[] args) { Example frame = new Example(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(500,500); frame.setVisible(true); } } 

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 19 jgs Layouts import javax.swing.*; public class Example extends JFrame{ public Example() { super("Hello World Swing"); GridLayout layout = new GridLayout(3,3); setLayout(layout); JLabel label = new JLabel("Hello World"); add(label); JButton button = new JButton("Click Me"); add(button); JTextField text = new JTextField("Text", 10); add(text); JCheckBox check = new JCheckBox("Option"); add(check); } public static void main(String[] args) { Example frame = new Example(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(500,500); frame.setVisible(true); } } 

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 20 jgs import javax.swing.*; public class Example extends JFrame{ public Example() { super("Hello World Swing"); BorderLayout layout = new BorderLayout(); setLayout(layout); JLabel label = new JLabel("Hello World"); add(label, BorderLayout.CENTER); JButton button = new JButton("Click Me"); add(button , BorderLayout.SOUTH); JTextField text = new JTextField("Text", 10); add(text , BorderLayout.NORTH); JCheckBox check = new JCheckBox("Option"); add(check , BorderLayout.EAST); } public static void main(String[] args) { Example frame = new Example(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(500,500); frame.setVisible(true); } } Layouts 

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 21 jgs Questions 

jgs CSE 205 Object-Oriented Programming and Data Structures Javier Gonzalez-Sanchez, Ph.D. [email protected] Fall 2021 Copyright. These slides can only be used as study material for the class CSE205 at Arizona State University. They cannot be distributed or used for another purpose.