Basic Program

Question 1

JFrame

Answer 1

Window that contains a title/border. It is used to display graphics.

Question 2

Double-Buffering

Answer 2

The act of drawing graphics off-screen (back buffer) and then copying the data to the main display (primary surface).

Question 3

block line transfer (blitting)

Answer 3

The process of copying contents from the back buffer to the primary surface.

Question 4

Page flipping

Answer 4

The act of alternating the value of the video pointer containing the video data to be drawn between the back buffer and the primary surface.

Question 5

Abstract Window Toolkit (AWT)

Answer 5

Java’s original platform-dependent windowing, graphics, user-interface widget toolkit.

Question 6

Swing

Answer 6

Java’s new GUI widget toolkit -> As it is written entirely in java, it is platform independent and aims to provide a more sophisticated control over graphics than the AWT.

Question 7

Canvas

Answer 7

Class used to draw to the screen. A subclass that extends from canvas must be added to the JFrame using the add() method

Question 8

Paint

Answer 8

void paint(graphics g) must be overridden, it is called when repaint() is called (generally from the main update method). super.paint() may be called to clear the canvas

Question 9

Useful JFrame methods

Answer 9

add() -> used to add components like the canvas
addKeyListener()
pack() -> Sets components size
setVisible()
setPreferredSize(Dimension dim)
setDefaultCloseOperation(minimize/exit…)

Question 10

KeyListener

Answer 10

A class can implement the KeyListener interface to override KeyPressed() / KeyReleased(). This class must be added to the JFrame using the addKeyListener() method