Difference between class variable and instance variable in java

Consider the following class:

public class IdentifyMyParts {
    public static int x = 7;
    public int y = 3;
} 

1. Question: What are the class variables?
   Answer: x
2. Question: What are the instance variables?
   Answer: y
3. Question: 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("a.x = " + a.x); 
   System.out.println("b.x = " + b.x); 
   System.out.println("IdentifyMyParts.x = " + IdentifyMyParts.x);
   

   Answer: Here is the output:

    a.y = 5 
    b.y = 6 
    a.x = 2 
    b.x = 2
    IdentifyMyParts.x = 2
   

   Becausexis defined as apublic static intin the classIdentifyMyParts, every reference toxwill have the value that was last assigned becausexis a static variable (and therefore a class variable) shared across all instances of the class. That is, there is only onex: when the value ofxchanges in any instance it affects the value ofxfor all instances ofIdentifyMyParts