MCQ 1 What is the error in the following class definitions?

abstract class XY { abstract sum(int x, int y){ } }

(A) Class header is not defined properly (B) Constructor is not defined (C) Method is not defined properly (D) No error

MCQ 2 What are the part in executing a Java program and their purposes?

(A) Java Compiler (B) Java Interpreter (C) Java Pre-processor (D) Directive Pre-processor

MCQ 3 State true of false.

• i) Public can only be assigned to class
• ii) Protected protects a statement
• iii) Protected method is never accessible outside the package
• iv) Friendly variable may be accessible outside class
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(A) i-true, ii-true, iii-false, iv-true (B) i-true, ii-false, iii-true, iv-false (C) i-false, ii-true, iii-false, iv-false (D) i-true, ii-false, iii-false, iv-true

Correct Answer Choice C i-false, ii-true, iii-false, iv-false
See Answer

MCQ 4 In java a ___________ is a sequence of characters.

(A) string (B) arrayChar (C) groupChar (D) collection

MCQ 5 Java programs perform I/O through _______________.

(A) I/O methods (B) I/O package (C) streams (D) compiler

MCQ 6 Which of the following methods belong to the string class?

(A) length( ) (B) compare To ( ) (C) equals ( ) (D) All of them

MCQ 7 If m and n are int type variables, what will be the result of the expression m%n when m=5 and n=2 ?

(A) 0 (B) 1 (C) 2 (D) None of the above

MCQ 8 State true of false.

• i) AWT is an extended version of swing
• ii) Paint() of Applet class cannot be overridden
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(A) i − False, ii − False (B) i − False, ii − True (C) i − True, ii − False (D) i − True, ii − True

Correct Answer Choice A i − False, ii − False
See Answer

MCQ 9 Using which keyword we can access value of the instance variables and class variables of that class inside the method of that class itself.

(A) super (B) final (C) this (D) either super or this

MCQ 10 If a variable is declared final, it must include _____________value.

(A) integer (B) no (C) initial (D) float

MCQ 11 Methods can be overloaded with a difference only in the type of the return value.

(A) Not supported (B) 0 (C) 1 (D) None of the above

MCQ 12 The keywords reserved but used in the initial version of Java are

(A) union (B) const (C) inner (D) goto

MCQ 13 Method overriding is combination of _____________ and _______________?

(A) inheritance (B) polymorphism (C) both (D) none of these

MCQ 14 Which component is used to compile, debug and execute java program?

(A) JVM (B) JDK (C) JIT (D) JRE

MCQ 15 Native protocol pure Java converts ________________ into the ______________ used by DBMSs directly.

(A) JDBC calls, network protocol (B) ODBC class, network protocol (C) ODBC class, user call (D) JDBC calls, user call

MCQ 16 Which is the root class of all AWT events

(A) java.awt.ActionEvent (B) java.awt.AWTEvent (C) java.awt.event.AWTEvent (D) java.awt.event.Event

MCQ 17 What will be the result of compiling following code.

public class MyClass{
public static void main(String args[]){
System.out.println("In first main()”); } public static void main(char args[]){ System.out.println (‘a’);}}

(A) Code will not compile and will give “Duplicate main() method declaration” error (B) Code will compile correctly but will give a runtime exception (C) Code will compile correctly and will print “In first main()” (without quotes) when it is run (D) Code will compile correctly and will print “a” (without quotes) when it is run

MCQ 18 Consider the following code

if(number>=0) if(number>0) system.out.println(“Number is positive”); else system.out.println(“Number is negative”);

What will be the output if number is equal to 0?

(A) Number is negative (B) Number is positive (C) Both A and B (D) None of the above

MCQ 19 A _____________ class may not have any abstract method.

(A) abstract (B) static (C) final (D) public

MCQ 20 A ______________ object cannot be modified after it is created.

(A) double (B) int (C) string (D) main

MCQ 21 Every method of a ______________ is implicitly final.

(A) static class (B) dynamic class (C) final class (D) abstract class

MCQ 22 A _____________ is a small unit of process.

(A) method (B) thread (C) applet (D) steam

MCQ 23 Which method Drops all changes made since the previous commit/rollback?

(A) public void rollback() (B) public void commit() (C) public void close() (D) public Statement createStatement()

MCQ 24 Which one of the following is not a wrap class?

(A) Random (B) Byte (C) Double (D) Short

MCQ 25 The java visibility modifier is

(A) Public (B) Public (C) Protected (D) All of these