Questions in Core Java 2
Which method of the Component class is used to set the position and
size of a component?
How many bits are used to represent Unicode, ASCII, UTF-16, and UTF-8
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.
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.
Which java.util classes and interfaces support event handling?
The EventObject class and the EventListener interface support event
Is sizeof a keyword?
The sizeof operator is not a keyword.
What are wrapped classes?
Wrapped classes are classes that allow primitive types to be accessed
Does garbage collection guarantee that a program will not run out
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
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).
Can an object's finalize() method be invoked while it is reachable?
An object's finalize() method cannot be invoked by the garbage collector
while the object is still reachable. However, an object's finalize() method
may be invoked by other objects.
What is the immediate superclass of the Applet class?
What is the difference between preemptive scheduling and time slicing?
Under preemptive scheduling, the highest priority task executes until
it enters the waiting or dead states or a higher priority task comes into
existence. Under time slicing, a task executes for a predefined slice of
time and then reenters the pool of ready tasks. The scheduler then determines
which task should execute next, based on priority and other factors.
Name three Component subclasses that support painting.
The Canvas, Frame, Panel, and Applet classes support painting.
What value does readLine() return when it has reached the end of
The readLine() method returns null when it has reached the end of a
What is the immediate superclass of the Dialog class?
What is clipping?
Clipping is the process of confining paint operations to a limited
area or shape.
What is a native method?
A native method is a method that is implemented in a language other
Can a for statement loop indefinitely?
Yes, a for statement can loop indefinitely. For example, consider the
following: for(;;) ;
What are order of precedence and associativity, and how are they
Order of precedence determines the order in which operators are evaluated
in expressions. Associatity determines whether an expression is evaluated
left-to-right or right-to-left
When a thread blocks on I/O, what state does it enter?
A thread enters the waiting state when it blocks on I/O.
To what value is a variable of the String type automatically initialized?
The default value of an String type is null.
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