Java Questions 23

1. Reference variables can be declared as
   Answer:
   1. static
   2. instance variables
   3. method parameters
   4. local variables
2. When can instance variables be initialized?
   Answer:
   Instance variables can only be initialized when the class is instantiated, or they can be assigned a null value.
3. What are instance variables?
   Answer:
   Instance variables are the fields that belong to each unique object.
4. What are local variables?
   Answer:
   Local variables are variables declared within a method or block. A local variable is destroyed when the method has completed.
5. Where are local variables maintained?
   Answer:
   Local variables are always on the stack.


6. What is the life of a local variable?
   Answer:
   The life of a local variable is only within the scope of the method.
7. What is the difference between objects and local variables?
   Answer:
   Objects are placed on the heap and loal variables are placed on the stack.
8. The only modifier that can be placed in front of a local variable is "final"
   
   Answer:
9. Do local variables receive default values?
   Answer:
   No. Local variables do not receive default values.
10. What does the keyword "this" refer to ?
    Answer:
    The keyword "this" always refers to the object currently running.