Starting Out with Programming Logic and Design (4th Edition)
4th Edition
ISBN: 9780133985078
Author: Tony Gaddis
Publisher: PEARSON
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Expert Solution & Answer
Chapter 14, Problem 1SA
Explanation of Solution
Encapsulation:
- It combines the data and code into a single object
- It helps in restricting access to the methods.
- This helps in preventing the data from being modified due to accident.
- Object’s variable is not directly accessible.
- Underscore helps in preventing the data being accessed directly.
The encapsulation rules in python can be summarized as
| Public method | It is accessible from anywhere. |
| Public variables | It can be accessed from anywhere. |
| Private method | It can be accessed only in their own class |
| Private method | It is accessible only in their class or method. |
- It protects the data from tampering. By declaring the data field as private, direct modifications of properties is prevented...
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Students have asked these similar questions
Add a timer in the following code.
public class GameGUI extends JPanel { private final Labyrinth labyrinth; private final Player player; private final Dragon dragon; private Timer timer; private long elapsedTime;
public GameGUI(Labyrinth labyrinth, Player player, Dragon dragon) { this.labyrinth = labyrinth; this.player = player; this.dragon = dragon; String playerName = JOptionPane.showInputDialog("Enter your name:"); player.setName(playerName); elapsedTime = 0; timer = new Timer(1000, e -> { elapsedTime++; repaint(); }); timer.start();
}
@Override protected void paintComponent(Graphics g) { super.paintComponent(g); int cellSize = Math.min(getWidth() / labyrinth.getSize(), getHeight() / labyrinth.getSize());}
Change the following code so that when player wins the game, the game continues by creating new GameGUI with the same player. However the player's starting position is same, everything else should be reseted.
public static void main(String[] args) { Labyrinth labyrinth = new Labyrinth(10); Player player = new Player(9, 0); Random rand = new Random(); Dragon dragon = new Dragon(rand.nextInt(10), 9); JFrame frame = new JFrame("Labyrinth Game"); GameGUI gui = new GameGUI(labyrinth, player, dragon);
frame.setLayout(new BorderLayout()); frame.setSize(600, 600); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.add(gui, BorderLayout.CENTER); frame.pack(); frame.setResizable(false); frame.setVisible(true); }
public class GameGUI extends JPanel { private final Labyrinth labyrinth; private final Player player; private final Dragon dragon; private Timer timer; private long…
Create a menu item which restarts the game. Also add a timer, which counts the elapsed time since the start of the game level.
When the restart is pressed, the restarted game should ask the player' name (in the GameGUI constructor) and set the score of player to 0 (player.setScore(0)), and the timer should restart again. And create a logic so that if the player loses his life (checkGame if the condition is false), then save this number together with his name into two variables. And display two buttons where one quits the game altogether (System.exit(0)) and the other restarts the game.
public class GameGUI extends JPanel { private final Labyrinth labyrinth; private final Player player; private final Dragon dragon;
private final ImageIcon playerIcon = new ImageIcon("data/images/player.png"); private final ImageIcon dragonIcon = new ImageIcon("data/images/dragon.png"); private final ImageIcon wallIcon = new ImageIcon("data/images/wall.png"); private final ImageIcon…
Chapter 14 Solutions
Starting Out with Programming Logic and Design (4th Edition)
Ch. 14.1 - What is an object?Ch. 14.1 - Prob. 14.2CPCh. 14.1 - Prob. 14.3CPCh. 14.1 - What are public methods? What are private methods?Ch. 14.2 - You hear someone make the following comment: A...Ch. 14.2 - In this chapter, we use the metaphor of a cookie...Ch. 14.2 - Prob. 14.7CPCh. 14.2 - Prob. 14.8CPCh. 14.2 - When a class variable is said to reference an...Ch. 14.2 - Prob. 14.10CP
Ch. 14.2 - Prob. 14.11CPCh. 14.2 - What is a constructor? When does a constructor...Ch. 14.2 - What is a default constructor?Ch. 14.3 - Prob. 14.14CPCh. 14.3 - Suppose a class has a field named description. The...Ch. 14.3 - Prob. 14.16CPCh. 14.4 - Prob. 14.17CPCh. 14.4 - What technique was described in this section for...Ch. 14.4 - What are classes responsibilities?Ch. 14.4 - Prob. 14.20CPCh. 14.5 - In this section, we discussed superclasses and...Ch. 14.5 - Prob. 14.22CPCh. 14.5 - What does a subclass inherit from its superclass?Ch. 14.5 - Look at the following pseudocode; which is the...Ch. 14.6 - Look at the following pseudocode class...Ch. 14 - Prob. 1MCCh. 14 - Prob. 2MCCh. 14 - A(n) ____ is a member of a class that holds data....Ch. 14 - The _________ specifies how a classs field or...Ch. 14 - A classs fields are commonly declared with the...Ch. 14 - Prob. 6MCCh. 14 - In many programming languages, the _____ key word...Ch. 14 - A(n) ____ method gets a value from a class's field...Ch. 14 - A(n) ____ method stores a value in a field or...Ch. 14 - A(n) ____ method is automatically called when an...Ch. 14 - A set of standard diagrams for graphically...Ch. 14 - When the value of an item is dependent on other...Ch. 14 - A classs responsibilities are _____. a. objects...Ch. 14 - In an inheritance relationship, the _____ is the...Ch. 14 - In an inheritance relationship, the _____ is the...Ch. 14 - The ___________ characteristic of object-oriented...Ch. 14 - The practice of procedural programming is centered...Ch. 14 - Object reusability has been a factor in the...Ch. 14 - It is a common practice in object-oriented...Ch. 14 - One way to find the classes needed for an...Ch. 14 - The superclass inherits fields and methods from...Ch. 14 - Polymorphism allows a class variable of the...Ch. 14 - Prob. 1SACh. 14 - Prob. 2SACh. 14 - What is the difference between a class and an...Ch. 14 - In many programming languages, what does the New...Ch. 14 - The following pseudocode statement calls an...Ch. 14 - Prob. 6SACh. 14 - What does a subclass inherit from its superclass?Ch. 14 - Look at the following pseudocode, which is the...Ch. 14 - Prob. 1AWCh. 14 - Look at this partial class definition, and then...Ch. 14 - Look at the following description of a problem...Ch. 14 - In pseudocode, write the first line of the...Ch. 14 - Look at the following pseudocode class...Ch. 14 - Pet Class Design a class named Pet, which should...Ch. 14 - Car Class Design a class named Car that has the...Ch. 14 - Personal Information Class Design a class that...Ch. 14 - Emp1oyee and ProductionWorker Classes Design an...Ch. 14 - Essay Class Design an Essay class that extends the...
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