CSE205 Lecture 10

Object-Oriented Programming and Data Structures
Java Swing
(202202)

Transcript

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

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   Previously …
   Polymorphism
   

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

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

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

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

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   Test Yourselves
   Polymorphism
   

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

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   Note
   Java Programming for Assignment 01
   

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

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11. Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 11
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    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.
    

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

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

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    Graphical User Interfaces
    GUI
    

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

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16. Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 16
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    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); }
    }
    

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17. Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 17
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    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); }
    }
    

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18. Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 18
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    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); }
    }
    

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19. Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 19
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    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); }
    }
    

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20. Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 20
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    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
    

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

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    CSE 205 Object-Oriented Programming and Data Structures
    Javier Gonzalez-Sanchez, Ph.D.
    javiergs@asu.edu
    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.
    

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