Java Programming

Java Programming

Multiple Choice

What is the range of short data type in Java?

• -128 to 127

• -32768 to 32767

• -2147483648 to 2147483647

• None of the mentioned

Multiple Choice

Modulus operator, %, can be applied to which of these?

• Integers

• Floating – point numbers

• Both Integers and floating – point numbers

• None of the mentioned

Multiple Choice

class evaluate {

public static void main(String args[]) {

int a[] = {1,2,3,4,5}; int d[] = a; int sum = 0;

for (int j = 0; j < 3; ++j)

sum += (a[j] * d[j + 1]) + (a[j + 1] * d[j]);

System.out.println(sum); } }

• 38

• 39

• 41

• 40

Multiple Choice

Which of these can be returned by the operator &?

• Integer

• Boolean

• Character

• Integer or Boolean

Multiple Choice

class dynamic_initialization {

public static void main(String args[]) {

double a, b; a = 3.0; b = 4.0;

double c = Math.sqrt(a * a + b * b);

System.out.println(c); } }

• 5.0

• 25.0

• 7.0

• Compilation Error

Multiple Choice

When Overloading does not occur?

• More than one method with same name but different method signature and different number or type of parameters

• More than one method with same name, same signature but different number of signature

• More than one method with same name, same signature, same number of parameters but different type

• More than one method with same name, same number of parameters and type but different signature

Multiple Choice

Which of these statements are incorrect?

• Assignment operators are more efficiently implemented by Java run-time system than their equivalent long forms

• Assignment operators run faster than their equivalent long forms

• Assignment operators can be used only with numeric and character data type

• None of the mentioned

Multiple Choice

class increment {

public static void main(String args[]) {

double var1 = 1 + 5;

double var2 = var1 / 4;

int var3 = 1 + 5;

int var4 = var3 / 4;

System.out.print(var2 + " " + var4); } }

• 1 1

• 0 1.5

• 1.5 1

• 1 1.5

Multiple Choice

class increment {

public static void main(String args[]) {

int g = 3;

System.out.print(++g * 8); } }

• 24

• 32

• 25

• 34

Multiple Choice

class Output {

public static void main(String args[]) {

int a = 1; int b = 2; int c; int d;

c = ++b;

d = a++;

c++;

b++;

++a;

System.out.println(a + " " + b + " " + c); } }

• 4 4 3

• 3 3 4

• 3 4 4

• 4 3 3

Multiple Choice

class bitwise_operator {

public static void main(String args[]) {

int var1 = 42;

int var2 = ~var1;

System.out.print(var1 + " " + var2); } }

• 42 42

• 42 -43

• 43 42

• 43 -42

Multiple Choice

class bitwise_operator {

public static void main(String args[]) {

int a = 3;

int b = 6;

int c = a | b;

int d = a & b;

System.out.println(c + " " + d); } }

• 7 2

• 7 5

• 5 7

• 7 7

Multiple Choice

class leftshift_operator {

public static void main(String args[]) {

byte x = 64; int i; byte y;

i = x << 2;

y = (byte) (x << 2)

System.out.print(i + " " + y); } }

• 0 256

• 256 0

• 0 64

• 256 1

Multiple Choice

class rightshift_operator {

public static void main(String args[]) {

int x; x = 10;

x = x >> 1;

System.out.println(x); } }

• 2

• 7

• 5

• 10

Multiple Choice

Which of these keywords can be used to prevent Method overriding?

• static

• constant

• protected

• final

Multiple Choice

At line number 2 in the following code, choose 3 valid data-type attributes/qualifiers among “final, static, native, public, private, abstract, protected”

public interface Status {

/* insert qualifier here */ int MY_VALUE = 10;

}

• final, native, private

• final, static, protected

• final, private, abstract

• final, static, public

Multiple Choice

What will be the output of the following Java program?

class Alligator {

public static void main(String[] args) {

int []x[] = {{1,2}, {3,4,5}, {6,7,8,9}};

int [][]y = x;

System.out.println(y[2][1]); } }

• 2

• 3

• 7

• Compilation Error

Multiple Choice

What will be the output of the following Java program?

class Abc {

public static void main(String[]args) {

String[] elements = { "for", "tea", "too" };

String first = (elements.length > 0) ? elements[0]: null; } }

• Compilation error

• An exception is thrown at run time

• The variable first is set to null

• The variable first is set to elements[0]

Multiple Choice

What will be the output of the following Java program?

class selection_statements {

public static void main(String args[]) {

int var1 = 5; int var2 = 6;

if ((var2 = 1) == var1)

System.out.print(var2);

else

System.out.print(++var2); } }

• 1

• 3

• 2

• 5

Multiple Choice

What will be the output of the following Java program?

class Output {

public static void main(String args[]) {

final int a=10,b=20;

while(a<b)

{

System.out.println("Hello"); }

System.out.println("World"); } }

• Hello

• run time error

• Hello world

• compile time error

Multiple Choice

What will be the output of the following Java program?

class Alligator {

public static void main(String[] args) {

int []x[] = {{1,2}, {3,4,5}, {6,7,8,9}};

int [][]y = x;

System.out.println(y[2][1]); } }

• 2

• 3

• 7

• Compilation Error

Multiple Choice

class increment {

public static void main(String args[]) {

double var1 = 1 + 5;

double var2 = var1 / 4;

int var3 = 1 + 5;

int var4 = var3 / 4;

System.out.print(var2 + " " + var4); } }

• 1 1

• 0 1.5

• 1.5 1

• 1 1.5