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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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