22. How many bits are used to represent Unicode, ASCII,
UTF-16, and UTF-8 characters?
Unicode requires 16 bits and ASCII require 7 bits. Although
the ASCII character set uses only 7 bits, it is usually
represented as 8 bits. UTF-8 represents characters using 8, 16,
and 18 bit patterns. UTF-16 uses 16-bit and larger bit patterns.
23 What is the difference between yielding and sleeping?
When a task invokes its yield() method, it returns to the
ready state. When a task invokes its sleep() method, it returns
to the waiting state.
24. Which java.util classes and interfaces support event
handling?
The EventObject class and the EventListener interface
support event processing.
25. Is sizeof a keyword?
The sizeof operator is not a keyword.
26. What are wrapper classes?
Wrapper classes are classes that allow primitive types to be
accessed as objects.
27. Does garbage collection guarantee that a program will not
run out of memory?
Garbage collection does not guarantee that a program will
not run out of memory. It is possible for programs to use up
memory resources faster than they are garbage collected. It is
also possible for programs to create objects that are not
subject to garbage collection.
28. What restrictions are placed on the location of a package
statement within a source code file?
A package statement must appear as the first line in a
source code file (excluding blank lines and comments).
|
