Clicker questions
11/14/13
CSE 1102 Fall 2013
In this example, we want to be able to control the current Car using
MoveButtons, an XSlider, and a YSlider. Which design pattern does
this UML illustrate?
A.
Composite
B.
Holder
C.
Proxy
D.
Factory
E.
Impossible to tell from diagram
Both Holder and Proxy allow us to model something. The primary
difference between the two is
A. A Proxy has all of the methods associated with the Class it
models, Holder does not
B. A Holder can be associated with many classes that want to
access it; a Proxy can only be accessed by 1 class
C. The contents of a Holder can change, the contents of a proxy
are fixed at instantiation time
D. The contents of a Proxy can change, the contents of a Holder
are fixed at instantiation time
E. None of the above is the primary difference
1. public class SpeedSlider extends javax.swing.JSlider{
2.
private Accelerator _accelerator;
3.
public SpeedSlider(int anOrientation, Accelerator anAccelerator,
4.
int aMinSpeed, int aMaxSpeed, int aCurrentSpeed){
5.
super(anOrientation, aMinSpeed, aMaxSpeed, aCurrentSpeed);
6.
_accelerator = anAccelerator;
7.
...
8.
this.addChangeListener(new SpeedListener(this));
9.
}
10.
private class SpeedListener implements ChangeListener {
11.
private SpeedSlider _slider;
12.
public SpeedListener(SpeedSlider aSlider){
13.
_slider = aSlider;
14.
}
15.
public void stateChanged(ChangeEvent e) {
16.
_accelerator.setValue(_slider.getValue()),_slider.getValue());
17.
} } }
Why does SpeedListener have a SpeedSlider _slider set in its constructor?
A. The SpeedListener can work with multiple sliders.
B. The code is clearer, as this is hard to sort out
C. We want to distinguish between the Accelerator and the SpeedSlider
D. The SpeedListener needs to refer to its enclosing SpeedSlider.
E. None of the above is true
Time
public class Time {
private int _hours;
private int _minutes;
private int _seconds;
public Time(int h, int m, int s) {
_hours = h;
_minutes = m;
_seconds = s;
}
Tasks
public void tick();
public int compareTo(Time otherTime);
public int add (Time offset);
public int subtract(Time offset);
What's up with
this?
A. A program that will showcase
my mad Java skills
B. The next CSE 1102 assignment
C. A program that can compute
anything that is computable
D. A game that swept the world
in the 1970s
E. All of the above
The game
• Played on 2-d rectangular grid of cells
• A cell can be either alive or dead
• States (or generations) are sequential:
each state is determined by rules applied
to predecessor
The rules
•
•
•
•
Any live cell with fewer than two live neighbors
dies, as if caused by under-population.
Any live cell with two or three live neighbors
lives on to the next generation.
Any live cell with more than three live
neighbors dies, as if by overcrowding.
Any dead cell with exactly three live neighbors
becomes a live cell, as if by reproduction.
A cell can have 8 neighbors
(demo)
Model-View-Controller
A structure for controlling on-screen things
Model: contains the data
to be displayed
View: displays the data
on the screen
Controller: takes user input,
makes changes to Model