Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
57 Cards in this Set
- Front
- Back
|
What is a dependency line in Astah*? |
It shows what a driver class creates and uses to run. Example: Driver class --> utility class |
|
|
In Astah, what is the heading under which you can label dependency lines? |
Stereotype |
|
|
What is the Astah extension? |
.asta |
|
|
What does Instantiation mean? |
A method of an object may instantiate and use an object of another class to do a specific task but the object being used is not a fundamental part of the object using it. |
|
|
What is typical of instantiation regarding objects of classes? |
Typically, a method of one class instantiates and uses and object of another class but the object of the latter is not a part of the former. |
|
|
What is instantiation? |
Basically...creating an object of a class (an instance of a class) |
|
|
What is an aggregation? |
A type of "Has-a" relationship in which one object "Has-a" object of another class as an attribute, but that object is not essential to the existence of the other, and it is not instantiated by the constructor of the other. |
|
|
What are the 8 primitive Java value types? |
int, float, double, char, boolean, byte, short, long |
|
|
What is the variable of a primitive type? (according to Bailes?) |
A container for one value of its appropriate type. |
|
|
What happens when you assign another value to a variable (at least w/primitive types)? |
The second value replaces the first value (if there is an initial value). |
|
|
What is a reference type? |
A variable declared as a reference to an object of some class (either built in or user-defined). |
|
|
What is the value of a reference variable before it is given a proper object? |
Null |
|
|
What is a shallow copy as apposed to a standard copy. |
A shallow copy copies a reference, rather the original source of the value. |
|
|
How many references can a reference type refer to? |
Only one |
|
|
What are ordinary attributes and methods of a class called? Why? |
Instance items, because every object of the class has its own copy. |
|
|
What is a static item? |
An item that is shared by every instance (or object) of the class. |
|
|
Does the driver class have both instances and static items? |
No, it only has static items including the main method and only one driver. |
|
|
Main method can only reference instance/static objects (pick one!) |
Static |
|
|
What is an enumerated data type? |
A data type that has a small number of specific values. |
|
|
What is enum similar to as far as definition goes? |
Class |
|
|
Does enum normally have a constructor? |
No |
|
|
Should you include Enumerated types within other .java files? |
No, they should be in their own unique .java file |
|
|
What is any type of use of enumerated data? |
A reference |
|
|
How is the size of enumerations determined? |
By the initial order they are in when created. |
|
|
What are all the methods of the Enumeration Type? |
toString ordinal equals compareTo values valueOf |
|
|
What does Enumeration's toString do? |
returns name of the constantq |
|
|
What does Enumeration's ordinal do? |
returns the zero-based position of the constant in the enum. |
|
|
What does Enumeration's equals do? |
accepts an object as an argument and returns true if the argument is equal to the calling enum constant. |
|
|
What does Enumeration's compareTo do? |
accepts an object as an argument and returns a negative integer if the calling constant's ordinal is less than the argument's ordinal, a positive integer if the calling constant's ordinal is greater than the argument's ordinal, and zero if the calling constant's ordinal equals the argument's ordinal. |
|
|
What does Enumeration's values do? |
Returns an array of all the values the enumerated type has. |
|
|
What does Enumeration's valueOf do? |
static method that returns the enumerated value corresponding to the string used as a parameter: an exception will be thrown if the string parameter does not exactly match one of the enumerated type's values including the correct case. |
|
|
How do you convert an Enum to a String? |
Use the toString method of the enum type. EX: PhotoType.JPG.toString() |
|
|
How do you convert a String to Enum? |
use the valueOf method of the enum type |
|
|
Translate this: for (face F : face.values()) System.out.println(F); |
For every face that I will call F, output the value of face |
|
|
What is the class in Java API for creating random numbers? |
Random |
|
|
How do you import the Random class into your file? |
import java.util.Random; Random randomNumber = new Random(); |
|
|
Name the methods (learned so far) of the Random class |
nextDouble() - returns the next random number as a double. The number will be within the range of o.o and 1.0 nextFloat() - Returns the next random number as a float, will be within range of 0.0 and 1.0 nextInt() - returns the next random number as an int within the range of -2,147,483,648 to +2,147,483,648. nextInt(int n) - This method accepts and integer argument, n, It returns a random number as an int. The number will be within the range of 0 to n. |
|
|
How are the random numbers distributed? |
Uniformly distributed - all values in the range are equally likely to occur. |
|
|
When using nextInt(n) in the Random class, is n included within the range? |
No, it is 0 - (n - 1) that are possible values. |
|
|
How do you create a "range of doubles"? |
double rand = r.nextDouble() * (d2 - d1) + d1 |
|
|
What is a dialog box? |
A small graphical window that displays a message to the user or requests input. |
|
|
What are the three simple dialog boxes that can be displayed using JOptionPane? |
Message Dialog Input Dialog Confirm Dialog |
|
|
What are the two arguments for "Message Dialog"? (when using the 2-argument constructor) |
(messageLocation, messageString) |
|
|
What are the arguments when using the 4-argument MessageDialog constructor? |
(messageLocation, message, title, icon) |
|
|
What are the icons that can be displayed in JOptionPane? |
JOptionPane.ERROR_MESSAGE JOptionPane.INFORMATION_MESSAGE JOptionPane.WARNING_MESSAGE JOptionPane.QUESTION_MESSAGE JOptionPane.PLAIN_MESSAGE |
|
|
What does a modal box do? |
it suspends execution of any other instructions in the program until the dialog box is closed. |
|
|
What are the features of an input dialog? |
Text field OK button Cancel button |
|
|
What are two overloaded versions of the static showInputDialog method |
showInputDialog(Object message) showInputDialog(Component parent, Object message String title, int messageType) |
|
|
What are the default values for the input dialog? |
has the string "Input" in its title bar and displays a question icon. |
|
|
How would you handle when a particular value is entered very frequently with Input Dialog? |
The value can be used as a default value the user can either accept or replace: JOptionPane.showInputDialog(prompt, defaultValue) |
|
|
What is the only type of data the Input Dialog inputs? |
String |
|
|
How do wrapper classes relate to primitive data types? |
They are used to Parse Strings to other types. The name differs normally only in that the first letter is capitalized...ex: byte - Byte | int - Integer |
|
|
How would you parse a String "1" to a byte? |
byte bVar = Byte.parseByte("1") |
|
|
What is the default Confirm Box buttons? |
Yes, No, and cancel
& "Select an Option" in the title bar |
|
|
What are two overloaded versions of the showConfirmDialog? |
int showConfirmDialog(Component parent, Object message) int showConfirmDialog(Component parent, Object message, String title, int optionType) |
|
|
What are the three basic constants that the showConfirmDialog uses to compare the button results? |
JOptionPane.YES_OPTION JOptionPane.NO_OPTION JOptionPane.CANCEL_OPTION |
|
|
What, in the JOptionPane, offers more flexibility in buttons? |
Option Dialog |
