Interview
Questions in Core Java 2
Which method of the Component class is used to set
the position and size of a component?
setBounds()
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.
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 processing.
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 as objects.
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
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?
Panel
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 a file?
The readLine() method returns null when it has reached
the end of a file.
What is the immediate superclass of the Dialog class?
Window
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 than Java.
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 used?
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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