Java Reference
In-Depth Information
attempt to locate the
com.horstmann.bigjava
package in
/home/walters/lib/com/horstmann/bigjava/com/horstmann/bigjava
and won't find the files.
S
ELF
C
HECK
18.
Which of the following are packages?
a.
java
b.
java.lang
c.
java.util
d.
java.lang.Math
19.
Is a Java program without
import
statements limited to using the
default and
java.lang
packages?
20.
Suppose your homework assignments are located in the directory
/home/me/cs101
(
c:\me\cs101
on Windows). Your instructor
tells you to place your homework into packages. In which directory do
you place the class
hw1.problem1.TicTacToeTester?
367
368
C
OMMON
E
RROR
8.3: Confusing Dots
In Java, the dot symbol ( . ) is used as a separator in the following situations:
ȗ
Between package names (
java.util
)
ȗ
Between package and class names (
homework1.Bank
)
ȗ
Between class and inner class names (
Ellipse2D.Double
)
ȗ
Between class and instance variable names (
Math.PI
)
ȗ
Between objects and methods (
account.getBalance()
)
When you see a long chain of dot-separated names, it can be a challenge to find
out which part is the package name, which part is the class name, which part is
an instance variable name, and which part is a method name. Consider
