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CSE460 Lecture 13

CSE460 Lecture 13

Software Analysis and Design
Observer
(202102)

B546a9b97d993392e4b22b74b99b91fe?s=128

Javier Gonzalez
PRO

July 13, 2020
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  1. jgs CSE 460 Software Analysis and Design Lecture 13: Observer

    Dr. Javier Gonzalez-Sanchez javiergs@asu.edu javiergs.engineering.asu.edu | javiergs.com PERALTA 230U Office Hours: By appointment
  2. jgs Previously … Design Patterns

  3. jgs 00000001 GoF Patterns

  4. jgs 00000001 Observer

  5. jgs 00000001 Observer

  6. jgs Java Implementation java.util.*

  7. jgs 00000001 Scenario Observer + update() Observable + addObserver() +

    notifyObservers() + setChanged() Tutor Student Classroom
  8. jgs 00000001 Student import java.util.Observable; import java.util.Observer; public class Student

    implements Observer { public String answerQuestion (String question) { return "I am thinking about \'" + question +"\'"; } @Override public void update(Observable o, Object arg) { String x = ((Tutor)o).getQuestion(); String y = this.answerQuestion(x); System.out.println(y); } }
  9. jgs 00000001 Tutor import java.util.Observable; public class Tutor extends Observable

    { private String [] questions = { "2 + 2", "public or private", "functional or not fuctional", "white or black" }; private String theQuestion; public void askQuestion() { theQuestion = questions[((int)(Math.random()*10))%4]; setChanged(); notifyObservers(); } public String getQuestion() { return theQuestion; } }
  10. jgs 00000001 Classroom public class Classroom { public static void

    main(String[] args) { Student student = new Student(); Tutor tutor = new Tutor(); tutor.addObserver(student); for (int i=0; i<5;i++) tutor.askQuestion(); } }
  11. jgs 00000001 Output

  12. jgs Example 2 Observer

  13. jgs 00000001 Scenario JFrame Observable + addObserver() + notifyObservers() +

    setChanged() Tutor Student Classroom Observer + update() JPanel TutorPanel JPanel
  14. jgs 00000001 Student (version 2) import java.util.*; import javax.swing.*; public

    class Student extends JPanel implements Observer { JLabel label = new JLabel(); public Student () { this.setBackground(Color.lightGray); ImageIcon background = new ImageIcon("src/student.png"); label.setIcon(background); add(label); } public String answerQuestion (String question) { return "I am thinking about \'" + question +"\'"; } @Override public void update(Observable o, Object arg) { String x = ((Tutor)o).getQuestion(); String y = this.answerQuestion(x); label.setText(y); } }
  15. jgs 00000001 Tutor (version 2) import java.util.Observable; public class Tutor

    extends Observable { private String theQuestion; public void askQuestion() { theQuestion = questions[((int)(Math.random()*10))%4]; setChanged(); notifyObservers(); } public void askQuestion(String s) { theQuestion = s; setChanged(); notifyObservers(); } public String getQuestion() { return theQuestion; } }
  16. jgs 00000001 TutorPanel import javax.swing.*; import javax.awt.*; public class TutorPanel

    extends JPanel implements ActionListener{ JTextField question = new JTextField(15); JButton ok = new JButton("send"); Tutor tutor; public TutorPanel(Tutor tutor) { this.tutor = tutor; setBackground(Color.white); ImageIcon background = new ImageIcon("src/prof.png"); JLabel label = new JLabel(); label.setIcon(background); add (question); add (ok); ok.addActionListener(this); add(label); } @Override public void actionPerformed(ActionEvent e) { tutor.askQuestion(question.getText()); } }
  17. jgs 00000001 Classroom (version 2) import java.awt.GridLayout; import javax.swing.JFrame; public

    class Classroom extends JFrame { public Classroom() { Student student = new Student (); Tutor tutor = new Tutor(); tutor.addObserver(student); setLayout(new GridLayout(2,1)); add(student); add(new TutorPanel(tutor)); } public static void main(String[] args) { JFrame window = new Classroom(); window.setSize(500, 500); window.setVisible(true); } }
  18. jgs 00000001 Output

  19. jgs Example 3 Observer

  20. jgs 00000001 Observer - Steps

  21. jgs 00000001 Source

  22. jgs 00000001 Boss

  23. jgs 00000001 NoteTaker

  24. jgs 00000001 World

  25. jgs CSE 460 Software Analysis and Design Javier Gonzalez-Sanchez javiergs@asu.edu

    Fall 2020 Disclaimer. These slides can only be used as study material for the class CSE460 at ASU. They cannot be distributed or used for another purpose.