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Objects and Classes

ENGR 131 test review

QuestionAnswer
Constructs that define objects of the same type Classes
Objects have both a ____ and a _____. State (defines object), behavior (defines what the object does).
Special kind of methods that are invoked to construct objects. Constructors
Constructor with no parameters is called a No-arg constructor
Return type of constructors? None; constructors do not have a return type, not even void.
Role of constructor Initialize objects
No-arg constructor with an empty body that's automatically provided if no constructors are explicitly declared in the class . Default Constructor
If a data field of a reference type does not reference any object, it has this value. Null
Default value for a reference type Null
Default value for a numeric type 0
Default value for a boolean type False
Default Value for a char type '\u0000'
Default value for a local variable inside a method None; Java doesn't assign one.
Object that is no longer referenced and is cleaned up by JVM Garbage
How to access date class java.util.date, use .toString method to return the date and time as a string.
How to use Random class java.util.Random Random random1 = new Random(3) where 3 is the seed random1.nextInt(1000) generates a random number up to 1000
Variables that belong to a specific instance Instance variables
Methods invoked by an instance of the class Instance methods
Variables shared by all instances of the class Static variables
Methods not tied to a specific object Static methods
Final variables shared by all the instances of the class Static constants
Class, data, or method is visible to any class in any package public
The data or methods can be accessed only by the declaring class. Private
Created by: 1029916386
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