CS 349 Java Final Exam

These flashcards cover essential Java programming concepts and components relevant for the final exam.

Encapsulation

Hiding internal details and showing only functionalities.

Inheritance

Mechanism where one class acquires properties of another.

Polymorphism

Ability of an object to take on many forms.

Abstraction

Hiding complex implementation details and showing only essentials.

executeUpdate()

Executes SQL commands like INSERT, UPDATE, DELETE.

executeQuery()

Executes SQL SELECT queries and returns ResultSet.

Event Handling Steps

Create Event Source -> Create Listener -> Register Listener.

ActionListener Interface

Responds to action events like button clicks; uses actionPerformed().

Button Creation

Button b = new Button("Click Me");

TextField Retrieval

Use tf.getText() to get input from a text field.

Method Overloading

Same method name but different parameters.

Method Overriding

Child class redefines a parent method with same signature.

Constructor Rules

No return type; name must match class.

Object Class Methods

Includes toString(), equals(), hashCode(), clone().

Interfaces in Java

Contain only public, abstract methods and public static final fields.

Implementing an Interface

Use 'implements' keyword in class declaration.

UML Class Diagram

Top: Class Name; Middle: Fields; Bottom: Methods.

UML Inheritance

Solid line and hollow arrow pointing to parent class.

Native Apps

Built specifically for Android/iOS platforms.

Web Apps

Accessed through a browser, not installed.

Hybrid Apps

Combination of native and web technologies.

RelativeLayout

Widgets positioned relative to others using IDs.

FrameLayout

Stacks multiple views on top of each other.

Good Layout Practice

Minimize layout depth for better performance.

Android Modes

Design Mode, Code Mode, Split Mode.

onCreate() Method

Initializes activity; sets content view.

setContentView()

Loads XML layout into an activity.

MVC Pattern in Android

Model: Data, View: UI Layouts, Controller: Activity logic.

Activity Component

Screen with a user interface.

Service Component

Runs background operations with no UI.

Broadcast Receiver

Listens for system-wide broadcast messages.

Content Provider

Shares data between apps, e.g., contacts.