Class and Instance
class IdentifyMyParts { public static int x=7; public int y=3;}
What are the class variable? What are the instance variables?
What is the output from the following code:
IdentifyMyParts a = new IdentifyMyParts(); IdentifyMyParts b = new IdentifyMyParts(); a.y = 5; b.y = 6; a.x = 1; b.x = 2; System.out.println("a.y = " +a.y); System.out.println("b.y = " +b.y); System.out.println("IdentifyMyParts.x = " +a.x); System.out.println("b.x = " +b.x);
View Answers
October 27, 2011 at 12:35 PM
Instance variables are declared in a class, but outside a method. They are also called member or field variables. When an object is allocated in the heap, there is a slot in it for each instance variable value. Therefore an instance variable is created when an object is created and destroyed when the object is destroyed. Visible in all methods and constructors of the defining class, should generally be declared private, but may be given greater visibility.
Class variables are declared with the static keyword in a class, but outside a method. There is only one copy per class, regardless of how many objects are created from it. They are stored in static memory. It is rare to use static variables other than declared final and used as either public or private constants.
output is:
a.y=5 b.y=6 IdentifyMyParts.x=2 b.x=2
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