java questions for viva

Java questions and answers for viva

(1)



public class Literal {

public static void main(String[] args) {

String str$="world";

char str_='X';

String $_=str$+str_;

System.out.print($_);



}

}



What will output when you compile and run the above code?



(a)world

(b)worldX

(c)world�X�

(d)Compiler error











Answer: (b)

Character literals questions on java and answer with solution

Objective types questions and answers of character literals in java


(1)



public class Literal {

public static void main(String[] args) {

char b ='\n';

int a=(int)b;

System.out.println(a);

}

}



What will output when you compile and run the above code?



(a)10

(b)11

(c)12

(d) Compiler error









Answer: (a)





(2)



public class Literal {

String literal questions on java and answer with solution

Objective type
questions of string literals and answers in java programming



(1)



public class Literal {

public static void main(String[] args) {

String a="c:\\tc\\bin";

System.out.println(a);

}

}



What will output when you compile and run the above code?



(a) c:\\tc\\bin

(b) c:\tc\bin

(c) c: c\bin

(d) Compiler error











Answer: (b)



(2)

variables questions on java with explanation

Questions on variables in java with answers


(1)



public class Test {

public static void main(String[] args) {

int a=5;

{

Integer b=10;

}

int c=a+b;

System.out.println(c);

}

}



What will output when you compile and run the above code?



(a)15

(b)5

(c)Compiler error

(d) Run time error











Answer: (c)

Automatic type promotion questions on java and answer with solution

Java objective questions on automatic type promotion and answers


(1)



public class TypeConversion {

public static void main(String[] args) {

{

final int a='\15';

System.out.println(a);

}

int a=25;byte b=0100;

a=a+b;

System.out.println(a);

}

}



What will output when you compile and run the above code

java scjp questions and answers

Objective type questions for preparation of scjp exam and answers in java



(1)




public class Loop {

public static void main(String[] args){



for(int i=0;false;i++){

System.out.println("java");

}

}

}



What will be output of above program?



(a)java

(b) Null

(c)It will not print anything.

(d)Compiler error













Answer: (d)



(2)

java questions for beginners

Simple java objective type questions and answers for beginners

(1)



public class Loop {

public static void main(String[] args){

int i=1;

int j=5;



for(;;){

System.out.println(j>>>i);

}

}

}



What will be output of the above java program?



(a)2

1

(b)2

1

0

(c)Infinite loop

(d)Compiler error













Answer:

Bitwise operators questions in java

Bit wise operators objective type questions and answers



(1)




public class BitwiseOpe {

public static void main(String[] args) {

int a=010;

Integer b=10;

double d=~a|(b=a)<<2+b;

System.out.print(d);

}

}



What will output when you compile and run the above code?



(a)32768.0

(b)-9.0

(c)1.0

(d)Compiler error













Answer: (b)

Operators questions in java

Questions on operators in java questions and answers

(1)



public class BitwiseOpe {

public static void main(String[] args) {

int a=010;

Integer b=10;

double d=~a|(b=a)<<2+b;

System.out.print(d);

}

}



What will output when you compile and run the above code?



(a)32768.0

(b)-9.0

(c)1.0

(d)Compiler error













Answer: (b)



(2)

static keyword interview questions in java

Interview questions of static keyword in java and answers

(1)



class StaticDemo {

static int a=0;

int b=++a;

static int c=++a;



public static void main(String[] args){

System.out.print(c);

}

}



What will be output of above program?



(a)0

(b)1

(c)2

(d)Compiler error













Answer: (b)



(2)



class StaticDemo {

int a=0;

super java keyword questions and answers

Question on java keyword super and answers

(1)



class Square{

static double pi=Math.PI;



static void area(double r){

System.out.print((int)pi*r*r);

}

}



class Cube extends Square{

static void area(double r){

System.out.print(6*(int)pi*r*r);

}

}



class SuperDemo extends Cube{

public static void main(String[] args) {

abstract class questions in java

Objective type questions on abstract class in java and answers

(1)



abstract class Abstract {



public static void main(String[] args){

System.out.print("It is abstract class");

}



static{

System.out.println("Why");

}

}



What will output when you compile and run the above code?



(a) Why

It is abstract class

(b) It is

Example of interface in java

Objective type questions on interface in java and answers

(1)



interface Apple{

float cost=9.5f;

public void display();

}



class Try implements Apple{



public static void main(String[] args){

Try t=new Try();

t.display();

}



public void display(){

System.out.print("cost of apple is :"+cost);

}

}



What will output when

Questions on enum data type in java and answers

Questions on enum data type in java and answers

(1)



enum Barcode{

a,b,c,d,e;

}



public class EnumTest {

public static void main(String[] args) {

System.out.println(Barcode.b);

}

}



What will output when you compile and run the above java code?



(a)1

(b)2

(c)b

(d)Compiler error













Answer:(c)



(2)



enum Barcode{

a,b,c,d,e;

}



public

break and continue questions in java

break and continue keyword questions and answers in java

(1)



Which of the following jump statement is not supported by java?



(a) break

(b) goto

(c) continue

(d) return







Answer: (b)



(2)



public class BreakDemo {

public static void main(String[] args){

int j=1;

for(int i=1;i<5;i++){

j*=i;{

break;

}

How to reverse a number in java

Java code to reverse a given number


import java.io.*;



class Test {

public static void main(String[] args) throws IOException {



int num,sum=0,r;

System.out.println("Enter a number");

BufferedReader br=new BufferedReader(new InputStreamReader (System.in));

num=Integer.parseInt(br.readLine());



while(num!=

GCD of two numbers in java

Java code to to find GCD or Greatest common divisor of two numbers





import java.io.*;




class Test {

public static void main(String[] args) throws IOException {

int n1,n2;

System.out.println("Enter first number:");

BufferedReader br1=new BufferedReader(new InputStreamReader (System.in));

n1=Integer.parseInt(br1.readLine());

System.out.println("Enter

Program to find fibonacci series in java

Java code to print Fibonacci series





import java.io.*;




class Test {



public static void main(String[] args) throws IOException {



int i=0,j=1,k=2,r,f;

System.out.println("Enter the range:");

BufferedReader br=new BufferedReader(new InputStreamReader (System.in));

r=Integer.parseInt(br.readLine());

System.out.println("FIBONACCI SERIES: ");

Binary to decimal conversion in java

Java code to covert binary number to decimal number

import java.io.*;



class Test {

public static void main(String[] args) throws IOException {

long no,n=0l,j=1,rem,no1;

System.out.println("Enter the binary number");

BufferedReader br=new BufferedReader(new InputStreamReader (System.in));

no=Long.parseLong(br.readLine());

no1=no;

Perfect number program in java

Java code to check given number is perfect number or not

import java.io.*;



class Test {

public static void main(String[] args) throws IOException {

int n,i=1,sum=0;

System.out.println("Enter a number:-");

BufferedReader br=new BufferedReader(new InputStreamReader (System.in));

n=Integer.parseInt(br.readLine());



while(i>0){