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Java Interview Questions and Answers
What is the range of the short type?
The range of the short type is -(2^15) to 2^15 - 1.
What is the range of the char type?
The range of the char type is 0 to 2^16 - 1.
In which package are most of the AWT events that support the
event-delegation model defined?
Most of the AWT-related events of the event-delegation model are defined
in the java.awt.event package. The AWTEvent class is defined in the
java.awt package.What is the immediate super class of Menu?
What is the immediate super class of Menu? MenuItem
What is the purpose of finalization?
The purpose of finalization is to give an unreachable object the
opportunity to perform any cleanup processing before the object is
garbage collected.
Which class is the immediate super class of the MenuComponent class.
Object What invokes a thread's run() method?
After a thread is started, via its start() method or that of the Thread
class, the JVM invokes the thread's run() method when the thread is
initially executed.What is the difference between the Boolean & operator and the &&
operator?
If an expression involving the Boolean & operator is evaluated, both
operands are evaluated. Then the & operator is applied to the operand.
When an expression involving the && operator is evaluated, the first
operand is evaluated. If the first operand returns a value of true then
the second operand is evaluated. The && operator is then applied to the
first and second operands. If the first operand evaluates to false, the
evaluation of the second operand is skipped.
Name three subclasses of the Component class.
Box.Filler, Button, Canvas, Checkbox, Choice, Container, Label, List,
Scrollbar, or TextComponent
What is the GregorianCalendar class?
The GregorianCalendar provides support for traditional Western
calendars.
Which Container method is used to cause a container to be laid out
and redisplayed?
validate()
What is the purpose of the Runtime class?
The purpose of the Runtime class is to provide access to the Java
runtime system.
How many times may an object's finalize() method be invoked by the
garbage collector?
An object's finalize() method may only be invoked once by the garbage
collector.
What is the purpose of the finally clause of a try-catch-finally
statement? garbage collector?
The finally clause is used to provide the capability to execute code no
matter whether or not an exception is thrown or caught.
What is the argument type of a program's main() method?
A program's main() method takes an argument of the String[] type.
Which Java operator is right associative?
The = operator is right associative.
What is the Locale class?
The Locale class is used to tailor program output to the conventions of
a particular geographic, political, or cultural region.
Can a double value be cast to a byte?
Yes, a double value can be cast to a byte.
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