Questions
Question 1: The
program
Problem.java
doesn't compile. What do you need to do to make it compile? Why?
Answer 1:
Delete static
in front of the declaration of the Inner
class. An static inner class does not have access to the instance fields of the outer class. See
ProblemSolved.java
.
Question 2: Use the
Java API documentation for the
Box
class (in the
javax.swing
package) to help you answer the following
questions.
a.
What static nested class does Box
define?
Answer 2a:
Box.Filler
b. What inner class does
Box
define?
Answer 2b:
Box.AccessibleBox
c. What is the
superclass of Box
s inner class?
Answer 2c:[java.awt.]Container.AccessibleAWTContainer
d. Which of Box
s nested
classes can you use from any class?
Answer 2d:
Box.Filler
e. How do you create an
instance of Box
s Filler
class?
Answer 2e: new
Box.Filler(minDimension, prefDimension, maxDimension)
Exercises
Exercise 1: Get the
file
Class1.java
.
a.
Compile and run Class1
. What is the output?
Answer:
InnerClass1: getString invoked.
InnerClass1:
getAnotherString invoked.