Java Multiple Choice Questions and Answers
Wednesday, February 17, 2010
Which Control Statements allow the program to choose different paths of execution?
Selection
Which Control Statements enable program execution to repeat one or more statements?
Iteration
The switch statement does not require a break.
False
In Interface we need not use the keyword abstract for the methods.
True
What are the Logical operators?
OR(|) , AND(&) , XOR(^)
Byte can be Cast to Double Value.
True
Which thread is created automatically when the program is started?
Main thread
Nested if is less efficient then switch statement.
True
________ are stored in hierarchical manner.
Packages
The mechanism by which java frees the memory occupied by unused objects is ________.
Garbage Collection
When you implement an interface method, it must be declared as :-
Public
What are primitive data types?
byte, short, int, long
In While loop condition can be any Boolean expression
True
Long makes it useful when big ________ numbers are needed.
Whole
Which Control Statement allow the program to execute in a non-linear fashion?
Jump
With java Type Casts are checked at both compile-time and runtime.
True
Java defines two ways when instantiating an object, such as :-
Can implement the runnable interface , Can extend the thread class
The explicit drop of an object reference by setting the value of a variable, whose data type is a reference type of ________.
Null
What is a string?
A combination of characters called as string
What are the programming constructs?
Sequential , Selection -- if and switch statements , Iteration -- for loop, while loop and do-while loop
What can be created by instantiating an object type thread?
Thread
In ________ statement the value of the expression is compared with each of the literal values in case statements.
Switch
How to declare an interface example?
access class classname implements interface.
Integer can Cast to byte value.
False
Transient variable is variable that may not be serialized.
True
Using which keyword we can fully abstract a class?
interface
The ________ loop repeats a set of statements a certain number of times until a condition is matched.
For
There are ________ kinds of Floating point type
Two
By default, all program import the java.lang package.
True
What returns a reference to the thread in which it is called?
Method , Class , Object
Do while loop always executes its body at least once, because its conditional expression is at the bottom of the loop.
True
Which statements can be used with the java's loop?
Jump , Continue , Break
________ are containers for classes.
Packages
Java's multithreading system is built upon :-
Thread class , Its methods , Companion interface
The default encoding of objects supports the ________ of the classes.
Evolution
Which are the keywords use in switch statement?
Case , Default
A Java application can execute anywhere on the network, this implements that Java is :-
Architecture neutral
Boolean values can be cast into any other primitive type.
False
Which one does not extend java.lang.Number?
Boolean , Character
The smallest integer type is ________.
Byte
Which is a public static member of thread?
currenthread( ) , mainthread( )
Casting does not affect the original object or value.
True
Anything declared ________ can be accessed from anywhere within program.
Public
Which method is used to determine the class of an object?
getClass( ) method
Method definition has four parts, they are :-
Name of the method , Type of object , List of parameters
Object oriented programming organizes a program around processes acting on data.
False
What are the possible access modifiers while implementing interface methods?
public
Which statement defines a name space in which classes are stored?
package
Which statement is used to explicitly return from a method?
Return
There are two distinct types of multitasking. Which are those?
Process based , Thread-base
Exit statement is optional in which loops in java?
While , Do-while , For
