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Could someone please review this for correctness??
Posted by Steve on May 05, 2000 at 3:42 PM
While trying to learn Java, I'm making flashcards until I get
the basics down. I'd be grateful if you could review the Q/A's
below and send any corrections to: yaeger2@gateway.net
I'd also appreciate any new Q/A's for my flashcards or
elaborations on Q/A's below. Thanks, Steve
Q1 Explain the appearance of a constructor, when compared to a
method.
A1 A constructor looks like a method, but it lacks a return
type.
Q2 Identify constructors and initializers in class CoffeeCup:
class CoffeeCup {
private int innerCoffee;
//..
}
A2 There are none.
Q3 Declare an uninitialized array of Point named myPoints.
A3 Point myPoints[];
Q4 In the code below, allocate an array of ten references to
Point, called myPoints, that are initialized to the null
reference:
Point myPoints[];
A4 myPoints = new Point[10]; (note: invalid??)
Q5 Which string object is for read-only objects ?
A5 The String class is for read-only objects.
Q6 Which string object is for modifiable objects ?
A6 The StringBuffer class is for objects that can be modified.
Q7 String objects provide ? to obtain the number of characters
in a string.
A7 String objects provide the length() accessor method to obtain the number of characters in a string.
Q8 A class definition has some or all of which six items ?
A8 class variables, instance variables, class methods,
instance methods, constructors, and static initializers
Q9 What is a class ?
A9 A class is a master copy of an object that determines what
behavior and attributes the object should have.
Q10 What's the format of a class called Dog ?
A10 [keywords] class Dog [extends Superclass] [implements Interface] {
// class body
}
Q11 What's a class variable ?
A11 A class variable is associated with a class of objects,
not just a single object.
Q12 What is AWT ?
A12 AWT stands for Abstract Windowing Toolkit; a set of Java
classes that has been extended by the Swing windowing classes. They can be used to display and control a GUI.
Q13 What is an argument ?
A13 An argument is extra info that is either sent to a program
at runtime (via the command prompt), or sent to a method during a program.
Q14 What is an array ?
A14 An array is a group of variables that share the same name
and store the same kind of info.
Q15 public Virus(String name, int size) {
author = name;
maxFileSize = size;
}
Write an example of code that could be used to call the above
constructor.
A15 Virus mumps = new Virus("Hall", 30000);
or the format....
Virus [reference] = new Virus("[string]", integer);
Q15 public Virus(String name, int size) {
author = name;
maxFileSize = size;
}
The above constructor could be called only if ?
A15 In the example code, the constructor could be called only
if a string and an integer were sent as arguments, along
with the new statement.
Q16 In OOP, what's an attribute do ?
A16 An attribute describes an object and distinguishes it from
others.
Q17 Where are attributes kept ?
A17 Attributes are stored in variables.
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