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Thread: Instance variables
- 01-26-2011, 05:33 PM #1Member
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- Oct 2010
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I think I'm making a concept harder than it really is again. No program written yet, just going through some concepts.
public class Clock
private int hr; // store the hours
private int min; // store the minutes
private int sec; // store the seconds
"The non-static data members of a class are called instance variables. Therefore, the variables hr, min, and sec are the instance variables of the class Clock."
Definition from :Variables (The Java™ Tutorials > Learning the Java Language > Language Basics)
Non-static fields are also known as instance variables because their values are unique to each instance of a class (to each object, in other words)...
I don't get it.The definition "unique to each instance of a class"?
- 01-26-2011, 05:38 PM #2
What happened when you threw together a simple example to play with?
Say you have some class called ExampleObject. ExampleObject has a non-static field in it called someVariable.
You can then have:
ExampleObject obj1 = new ExampleObject(); ExampleObject obj2 = new ExampleObject(); obj1.someVariable = 1; obj2.someVariable = 2;
That's not true with static variables. If you change the static variable of a class, you change it for every instance of that class.
I really recommend you throw together a basic example and test it out yourself.
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