Java programming Questions & Answers (Compiled from UPSC, SSC ,PSC ,IBPS previous question papers)

JAR file contains the compressed version of
.java file
.class file
.jsp file
None of above

In java, gc() method is available in which package
java.lang package
java.util package
java.awt package
java.io package

All methods of interface are public and abstract
True
False

Execution of the program is always begins with
Main method
class contain main method
parent class
default package

Super is the predefined
Keyword
Method
Keyword and Method
None of above

String is the predefined
Method
Class
Variable
Object

Which type of inheritance is not supported by java
Single
Multiple
Mulilevel
Hirarchical

Inheritance means
Sub class extends super class
Sub class extends Base class
Sub class create object of super class
All of the above

Methods that have same name, but different Parameter list and different definition known as
Overriding
Constructor
Overloading
none of these

If method have same name as class name and method dont have any return type then it is known as
Destructors
Object
Variable
Constructor

x=x+1 is equivalent to
++x
x++
x=x-1
None of these

pow () is associated with which class
Math class
Input stream class
Object class
None of above

After the compilation of the java source code, which file is created by the JVM
.class
.java
.cdr
.doc

JIT meaning
java in time
just in time
join in time
none of above

Thread class is available in
java.io package
java.lang package
java.awt package
java.util package

All collection classes are available in
java.io package
java.lang package
java.awt package
java.util package

Object which can store group of other objects is called
Collection object
Java object
Package
Wrapper

Which method executes only once
start() method
init() method
stop() method
destroy() method

Package of drawstring() method is
java.applet
java.io
javax.swing
java.awt

Converting a primitive type data into its corresponding wrapper class object instance is called
boxing
wrapping
instantiation
autoboxing

The Externizable interface extends the serializable interface
True
False

Which of the following statements about arrays is syntactically wrong
arrayName[] p = new arrayName[5];
arrayName p[5];
arrayName[] p [];
arrayName p[][] = new arrayName[2][];

The class java.sql.Timestamp is associated with
java.util.Time
java.sql.Time
java.util.Date
None of above

All raw data types should be read and uploaded to the database as an array of
int
char
bollean
byte

The JDBC-ODBC bridge is
Multithreaded
Singlethreaded
Both of above
None of above

Which statement is static and synchronized in JDBC API
executeQuery()
executeUpdate()
getConnection()
prepareCall()

Program which executes applet is known as
applet engine
virtual machine
JVM
None of above

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Java programming Question Answers, PSC, UPSC, IBPS, SSC Previous Papers