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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).