Quiz Time
Java

Which component is responsible to run java program?

• 1]

  JVM

• 2]

  JDK

• 3]

  JIT

• 4]

  JRE

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

• 1]

  JVM

• 2]

  JDK

• 3]

  JRE

• 4]

  JIT

What is the extension of java code files?

• 1]

  .class

• 2]

  .java

• 3]

  .txt

• 4]

  .js

Which component is responsible for converting bytecode into machine specific code?

• 1]

  JVM

• 2]

  JDK

• 3]

  JIT

• 4]

  JRE

Which component is responsible to optimize bytecode to machine code?

• 1]

  JVM

• 2]

  JDK

• 3]

  JIT

• 4]

  JRE

What is the extension of compiled java classes?

• 1]

  .class

• 2]

  .java

• 3]

  .txt

• 4]

  .js

How can we identify whether a compilation unit is class or interface from a .class file?

• 1]

  Java source file header

• 2]

  Extension of compilation unit

• 3]

  We cannot differentiate between class and interface

• 4]

  The class or interface name should be postfixed with unit type

What is use of interpreter?

• 1]

  They convert bytecode to machine language code

• 2]

  They read high level code and execute them

• 3]

  They are intermediated between JIT and JVM

• 4]

  It is a synonym for JIT

JVM Stands for  ________________.

• 1]

  Java Virtual Management

• 2]

  Java Virtual Memory

• 3]

  Java Virtual Machanism

• 4]

  Java Virtual Machine

Which of these is long data type literal?

• 1]

   0x99fffL

• 2]

  ABCDEFG

• 3]

  0x99fffa

• 4]

  99671246

Which of these can be returned by the operator &?

• 1]

  Integer

• 2]

  Boolean

• 3]

  Character

• 4]

  Integer or Boolean

What will be the output of the following Java program?

    public 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);
        } 
    }

• 1]

  5.0

• 2]

  25.0

• 3]

  7.0

• 4]

  Compilation Error

What will be the output of the following Java program?

    public class variable_scope 
    {
        public static void main(String args[]) 
        {
            int x;
            x = 5;
            {
	        int y = 6;
	        System.out.print(x + " " + y);
            }
            System.out.println(x + " " + y);
        } 
    }

• 1]

  5 6 5 6

• 2]

  5 6 5

• 3]

  Runtime error

• 4]

  Compilation error

What will be the output of the following Java program?

    public class array_output 
    {
        public static void main(String args[]) 
        {
       	    int array_variable [] = new int[10];
	    for (int i = 0; i < 10; ++i) {
                array_variable[i] = i/2;
                array_variable[i]++;
                System.out.print(array_variable[i] + " ");
                i++;
            }
 
        } 
    }

• 1]

  0 2 4 6 8

• 2]

  1 2 3 4 5

• 3]

   0 1 2 3 4 5 6 7 8 9

• 4]

  1 2 3 4 5 6 7 8 9 10

What will be the output of the following Java program?

    public 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);
        } 
    }

• 1]

  38

• 2]

  39

• 3]

  40

• 4]

  41

Which of these can not be used for a variable name in Java?

• 1]

  identifier

• 2]

  keyword

• 3]

  identifier & keyword

• 4]

  none of the mentioned

Which data type value is returned by all transcendental math functions?

• 1]

  int

• 2]

  float

• 3]

  double

• 4]

  long

Which of these literals can be contained in float data type variable?

• 1]

  -1.7e+308

• 2]

  -3.4e+038

• 3]

  +1.7e+308

• 4]

  -3.4e+050

An expression involving byte, int, and literal numbers is promoted to which of these?

• 1]

  float

• 2]

  byte

• 3]

  long

• 4]

  int

Which of the following are legal lines of Java code?

   1. int w = (int)888.8;
   2. byte x = (byte)100L;
   3. long y = (byte)100;
   4. byte z = (byte)100L;

• 1]

  1 and 2

• 2]

  2 and 3

• 3]

  3 and 4

• 4]

  All statements are correct

What is the range of byte data type in Java?

• 1]

  -128 to 127

• 2]

  -32768 to 32767

• 3]

  -2147483648 to 2147483647

• 4]

  None of the mentioned

What is the range of short data type in Java?

• 1]

  -128 to 127

• 2]

  -32768 to 32767

• 3]

  -2147483648 to 2147483647

• 4]

  None of the mentioned

What will be the output of these statement?

public class output {
        public static void main(String args[]) 
        {
            double a, b, c;
            a = 3.0/0;
            b = 0/4.0;
            c = 0/0.0;
 
	        System.out.println(a);
            System.out.println(b);
            System.out.println(c);
        } 
    }

• 1]

  Infinity

• 2]

  0.0

• 3]

  NaN

• 4]

  all of the mentioned

What will be the output of the following Java code? - Average

public class average {
   public static void main(String args[])
     {
         double num[] = {5.5, 10.1, 11, 12.8, 56.9, 2.5};
         double result;
         result = 0;
         for (int i = 0; i < 6; ++i) 
         {
           result = result + num[i];
         } 
	    System.out.print(result/6);
 
      } 
  }

• 1]

  16.34

• 2]

  16.566666644

• 3]

  16.46666666666667

• 4]

  16.46666666666666

What will be the output of the following Java code? - Increment / Decrement

public class increment {
   public static void main(String args[]) 
     {        
         int g = 3;
         System.out.print(++g * 8);
     } 
}

• 1]

  25

• 2]

  24

• 3]

  32

• 4]

  33

What will be the output of the following Java code? - Area Of Circle

public class area {
        public static void main(String args[]) 
        {    
             double r, pi, a;
             r = 9.8;
             pi = 3.14;
             a = pi * r * r;
             System.out.println(a);
        } 
    }

• 1]

  301.5656

• 2]

  301

• 3]

  301.56

• 4]

  301.56560000

Which of the below data type doesn’t support overloaded methods for +,-,* and /?

• 1]

  int

• 2]

  float

• 3]

  double

• 4]

  BigDecimal

What is the numerical range of a char data type in Java?

• 1]

  -128 to 127

• 2]

  0 to 256

• 3]

  0 to 32767

• 4]

  0 to 65535

What is the numerical range of a char data type in Java?Which of these coding types is used for data type characters in Java?

• 1]

  -128 to 127 ASCII

• 2]

  0 to 256 ISO-LATIN-1

• 3]

  0 to 32767 UNICODE

• 4]

  0 to 65535 UNICODE

Which of these values can a boolean variable contain?

• 1]

  True & False

• 2]

  0 & 1

• 3]

  Any integer value

• 4]

  True

Which one is a valid declaration of a boolean?

• 1]

  boolean b1 = 1;

• 2]

  boolean b2 = ‘false’;

• 3]

  boolean b3 = false;

• 4]

  boolean b4 = ‘true’

What is the output of this program?

public class array_output {
        public static void main(String args[]) 
        {    
            char array_variable [] = new char[10];
            for (int i = 0; i < 10; ++i) {
                array_variable[i] = 'i';
                System.out.print(array_variable[i] + "" );
                i++;
            }
        } 
    }

• 1]

  i i i i i

• 2]

  0 1 2 3 4

• 3]

  i j k l m

• 4]

  None of the mentioned

What is the output of this program?

public class mainclass {
        public static void main(String args[]) 
        {
            char a = 'A';
            a++;
            System.out.print((int)a);
        } 
    }

• 1]

  66

• 2]

  67

• 3]

  65

• 4]

  64

Which of the following is the advantage of BigDecimal over double?

• 1]

  Syntax

• 2]

  Memory usage

• 3]

  Garbage creation

• 4]

  Precision

What is the output of below code snippet?

   double a = 0.02;
   double b = 0.03;
   double c = b - a;
   System.out.println(c);
 
   BigDecimal _a = new BigDecimal("0.02");
   BigDecimal _b = new BigDecimal("0.03");
   BigDecimal _c = b.subtract(_a);
   System.out.println(_c);

• 1]

  0.009999999999999998
  0.01

• 2]

  0.01
  0.009999999999999998

• 3]

  0.01
  0.01

• 4]

  0.009999999999999998
  0.009999999999999998

What is the base of BigDecimal data type?

• 1]

  Base 2

• 2]

  Base 8

• 3]

  Base 10

• 4]

  Base e

Which of the following can be operands of arithmetic operators?

• 1]

  Numeric

• 2]

  Boolean

• 3]

  Characters

• 4]

  Both Numeric & Characters

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

• 1]

  Integers

• 2]

  Floating – point numbers

• 3]

  Both Integers and floating – point numbers

• 4]

  None of the mentioned

With x = 0, which of the following are legal lines of Java code for changing the value of x to 1?

   1. x++;
   2. x = x + 1;
   3. x += 1;
   4. x =+ 1;

• 1]

  1, 2 & 3

• 2]

  1 & 4

• 3]

  1, 2, 3 & 4

• 4]

  3 & 2

What will be the output of the following Java program?

    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);
        } 
    }

• 1]

  3 2 4

• 2]

  3 2 3

• 3]

  2 3 4

• 4]

  3 4 4

Can 8 byte long data type be automatically type cast to 4 byte float data type?

• 1]

  true

• 2]

  false

What will be the output of the following Java program?

    class Modulus 
    {
        public static void main(String args[]) 
        {    
             double a = 25.64;
             int  b = 25;
             a = a % 10;
             b = b % 10;
             System.out.println(a + " "  + b);
        } 
    }

• 1]

  5.640000000000001 5

• 2]

  5.640000000000001 5.0

• 3]

  5 5

• 4]

  5 5.640000000000001

What will be the output of the following Java program?

    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 1

• 2]

  0 1

• 3]

  1.5 1

• 4]

  1.5 1.0

Which of these statements are incorrect?

• 1]

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

• 2]

  Assignment operators run faster than their equivalent long forms

• 3]

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

• 4]

  None of the mentioned

Decrement operator, −−, decreases the value of variable by what number?

• 1]

  1

• 2]

  2

• 3]

  3

• 4]

  4

Which of these is not a bitwise operator?

• 1]

  &

• 2]

  &=

• 3]

  |=

• 4]

  <=

What will be the output of the following Java program?

    class Output 
    {
        public static void main(String args[]) 
        {    
             int a = 1;
             int b = 2;
             int c = 3;
             a |= 4;
             b >>= 1;
             c <<= 1;
             a ^= c;
             System.out.println(a + " " + b + " " + c);
        } 
    }

• 1]

  3 1 6

• 2]

  2 2 3

• 3]

  2 3 4

• 4]

  3 3 6

What will be the output of the following Java program?

    class rightshift_operator 
    {
        public static void main(String args[]) 
        {    
             int x; 
             x = 10;
             x = x >> 1;
             System.out.println(x);
        } 
    }

• 1]

  10

• 2]

  5

• 3]

  2

• 4]

  20

What will be the output of the following Java program?

    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);
        } 
    }

• 1]

  0 64

• 2]

  64 0

• 3]

  0 256

• 4]

  256 0

What will be the output of the following Java program?

    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);
        } 
    }

• 1]

  7 2

• 2]

  7 7

• 3]

  7 5

• 4]

  5 2

What will be the output of the following Java program?

    class bitwise_operator 
    {
        public static void main(String args[])
        {
            int var1 = 42;
            int var2 = ~var1;
            System.out.print(var1 + " " + var2);     	
        } 
    }

• 1]

  42 42

• 2]

  43 43

• 3]

  42 -43

• 4]

  42 43

Which of these statements are incorrect?

• 1]

  The left shift operator, <<, shifts all of the bits in a value to the left specified number of times

• 2]

  The right shift operator, >>, shifts all of the bits in a value to the right specified number of time

• 3]

  The left shift operator can be used as an alternative to multiplying by 2

• 4]

  The right shift operator automatically fills the higher order bits with 0

Which right shift operator preserves the sign of the value?

• 1]

  <<

• 2]

  >>

• 3]

  <<=

• 4]

  >>=

 On applying Left shift operator, <<, on integer bits are lost one they are shifted past which position bit?

• 1]

  1

• 2]

  32

• 3]

  33

• 4]

  31

Which operator is used to invert all the digits in a binary representation of a number?

• 1]

  ~

• 2]

  <<<

• 3]

  >>>

• 4]

  ^

What is the output of relational operators?

• 1]

  Integer

• 2]

  Boolean

• 3]

  Characters

• 4]

  Double

What will be the output of the following Java code?

    class Output 
    {
        public static void main(String args[]) 
        {    
             boolean a = true;
             boolean b = false;
             boolean c = a ^ b;
             System.out.println(!c);
        } 
    }

• 1]

  0

• 2]

  1

• 3]

  true

• 4]

  false

What will be the output of the following Java code?

    class Output 
    {
        public static void main(String args[]) 
        {    
             int x , y = 1;
             x = 10;
             if (x != 10 && x / 0 == 0)
                 System.out.println(y);
             else
                 System.out.println(++y);
        } 
    }

• 1]

  1

• 2]

  2

• 3]

  Runtime error owing to division by zero in if condition

• 4]

  Unpredictable behavior of program

What will be the output of the following Java code?

    class ternary_operator 
    {
        public static void main(String args[]) 
        {        
             int x = 3;
             int y = ~ x;
             int z;
             z = x > y ? x : y;
             System.out.print(z);
        } 
    }

• 1]

  0

• 2]

  1

• 3]

  3

• 4]

  -4

What will be the output of the following Java code?

    class bool_operator 
    {
        public static void main(String args[]) 
        {    
             boolean a = true;
             boolean b = !true;
             boolean c = a | b;
 	     boolean d = a & b;
             boolean e = d ? b : c;
             System.out.println(d + " " + e);
        } 
    }

• 1]

  false false

• 2]

  true ture

• 3]

  true false

• 4]

  false true

What will be the output of the following Java code?

    class Relational_operator 
    {
        public static void main(String args[])
        {
            int var1 = 5; 
            int var2 = 6;
            System.out.print(var1 > var2);
        } 
    }

• 1]

  1

• 2]

  0

• 3]

  true

• 4]

  false

Which of these statements is correct?

• 1]

  true and false are numeric values 1 and 0

• 2]

  true and false are numeric values 0 and 1

• 3]

  true is any non zero value and false is 0

• 4]

  true and false are non numeric values

Which of these operators can skip evaluating right hand operand?

• 1]

  !

• 2]

  |

• 3]

  &

• 4]

  &&

Which of the following operators can operate on a boolean variable?

   1. &&
   2. ==
   3. ?:
   4. +=

• 1]

  3 & 2

• 2]

   1 & 4

• 3]

   1, 2 & 4

• 4]

  1, 2 & 3

Which of these is returned by “greater than”, “less than” and “equal to” operators?

• 1]

  Integers

• 2]

  Floating – point numbers

• 3]

  Boolean

• 4]

  None of the mentioned

What will be the output of the following Java program?

class Output 
{
        public static void main(String args[]) 
        {    
             int a,b,c,d;
             a=b=c=d=20
            a+=b-=c*=d/=20
           System.out.println(a+" "+b+" "+c+" "+d);
 
        } 
}

• 1]

  compile time error

• 2]

  runtime error

• 3]

  a=20 b=0 c=20 d=1

• 4]

  none of the mentioned

Which of these lines of Java code will give better performance?

   1. a | 4 + c >> b & 7; 
   2. (a | ((( 4 * c ) >> b ) & 7 ))

• 1]

  1 will give better performance as it has no parentheses

• 2]

  2 will give better performance as it has parentheses

• 3]

  Both 1 & 2 will give equal performance

• 4]

  Dependent on the computer system

What will be the output of the following Java code?

class Output 
{
        public static void main(String args[]) 
        {    
             int x=y=z=20;
 
        } 
}

• 1]

  compile and runs fine

• 2]

  20

• 3]

  run time error

• 4]

  compile time error

What will be the output of the following Java code?

    class operators 
    {
        public static void main(String args[]) 
        {    
             int x = 8;
             System.out.println(++x * 3 + " " + x);
        } 
    }

• 1]

  24 8

• 2]

  24 9

• 3]

  27 8

• 4]

  27 9

What will be the output of the following Java code?

    class operators 
    {
        public static void main(String args[])
        {
            int var1 = 5; 
            int var2 = 6;
            int var3;
            var3 = ++ var2 * var1 / var2 + var2;
            System.out.print(var3);
        } 
    }

• 1]

  10

• 2]

  11

• 3]

  12

• 4]

  56

Which of these statements are incorrect?

• 1]

  Equal to operator has least precedence

• 2]

  Brackets () have highest precedence

• 3]

  Division operator, /, has higher precedence than multiplication operato

• 4]

  Addition operator, +, and subtraction operator have equal precedence

What is the order of precedence (highest to lowest) of following operators?

    1. &    
    2. ^
    3. ?:

• 1]

  1 -> 2 -> 3

• 2]

  2 -> 1 -> 3

• 3]

  3 -> 2 -> 1

• 4]

  2 -> 3 -> 1

 What is the value stored in x in the following lines of Java code?

   int x, y, z;
    x = 0;
    y = 1;
    x = y = z = 8;

• 1]

  0

• 2]

  1

• 3]

  9

• 4]

  8

What should be expression1 evaluate to in using ternary operator as in this line?

 expression1 ?  expression2  :  expression3

• 1]

  Integer

• 2]

  Floating – point numbers

• 3]

  Boolean

• 4]

  None of the mentioned

Which of these have highest precedence?

• 1]

  ()

• 2]

  ++

• 3]

  *

• 4]

  >>

Which of these are selection statements in Java?

• 1]

  if()

• 2]

  for()

• 3]

  continue

• 4]

  break

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]

  1

• 2]

  2

• 3]

  3

• 4]

  4

What will be the output of the following Java program?

    class jump_statments 
    {
        public static void main(String args[]) 
        {        
             int x = 2;
             int y = 0;
             for ( ; y < 10; ++y) 
             {
                 if (y % x == 0) 
                     continue;  
                 else if (y == 8)
                      break;
                 else
                    System.out.print(y + " ");
             }
        } 
    }

• 1]

  1 3 5 7

• 2]

  2 4 6 8

• 3]

  1 3 5 7 9

• 4]

  1 2 3 4 5 6 7 8 9

What would be the output of the following code snippet if variable a=10?

if(a<=0)
{
   if(a==0)
   {
     System.out.println("1 ");
   }
   else 
   { 
      System.out.println("2 ");
   }
}
System.out.println("3 ");

• 1]

  1 2

• 2]

  2 3

• 3]

  1 3

• 4]

  3

Which of these selection statements test only for equality?

• 1]

  if

• 2]

  switch

• 3]

  if & switch

• 4]

  none of the mentioned

Which of this statement is incorrect?

• 1]

  switch statement is more efficient than a set of nested ifs

• 2]

  two case constants in the same switch can have identical values

• 3]

  switch statement can only test for equality, whereas if statement can evaluate any type of boolean expression

• 4]

  it is possible to create a nested switch statements

What will be the output of the following Java program?

    class Output 
    {
        public static void main(String args[]) 
        {    
             int a = 5;
             int b = 10;
             first: 
             {
                second: 
                {
                   third: 
                   { 
                       if (a ==  b >> 1)
                           break second;
                   }
                   System.out.println(a);
                }
                System.out.println(b);
             }
        } 
    }

• 1]

  5 10

• 2]

  10 5

• 3]

  5

• 4]

  10

What is the valid data type for variable “a” to print “Hello World”?

switch(a)
{
   System.out.println("Hello World");
}

• 1]

  int and float

• 2]

  byte and short

• 3]

  char and long

• 4]

  byte and char

What will be the output of the following Java program?

    class comma_operator 
    {
        public static void main(String args[]) 
        {    
             int sum = 0;
             for (int i = 0, j = 0; i < 5 & j < 5; ++i, j = i + 1)
                 sum += i;
 	     System.out.println(sum);
        } 
    }

• 1]

  5

• 2]

  6

• 3]

  14

• 4]

  compilation error

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");
 
        } 
}

• 1]

  Hello

• 2]

  run time error

• 3]

  Hello world

• 4]

  compile time error

The while loop repeats a set of code while the condition is not met?

• 1]

  True

• 2]

  False

Which of the following loops will execute the body of loop even when condition controlling the loop is initially false?

• 1]

  do-while

• 2]

  while

• 3]

  for

• 4]

  none of the mentioned

What is true about do statement?

• 1]

  do statement executes the code of a loop at least once

• 2]

  do statement does not get execute if condition is not matched in the first iteration

• 3]

  do statement checks the condition at the beginning of the loop

• 4]

  do statement executes the code more than once always

Which of the following is not a decision making statement?

• 1]

  if

• 2]

  if-else

• 3]

  switch

• 4]

  do-while

What is true about a break?

• 1]

  Break stops the execution of entire program

• 2]

  Break halts the execution and forces the control out of the loop

• 3]

  Break forces the control out of the loop and starts the execution of next iteration

• 4]

  Break halts the execution of the loop for certain time frame

Which of the following is used with the switch statement?

• 1]

  Continue

• 2]

  Exit

• 3]

  break

• 4]

  do

From where break statement causes an exit?

• 1]

  Only from innermost loop

• 2]

  Terminates a program

• 3]

  Only from innermost switch

• 4]

  From innermost loops or switches

Which of these jump statements can skip processing the remainder of the code in its body for a particular iteration?

• 1]

  break

• 2]

  return

• 3]

  exit

• 4]

  continue

Which of the following is not OOPS concept in Java?

• 1]

  Inheritance

• 2]

  Encapsulation

• 3]

  Polymorphism

• 4]

  Compilation

What is it called if an object has its own lifecycle and there is no owner?

• 1]

  Aggregation

• 2]

  Composition

• 3]

  Encapsulation

• 4]

  Association

What is it called where child object gets killed if parent object is killed?

• 1]

  Aggregation

• 2]

  Composition

• 3]

  Encapsulation

• 4]

  Association

What is it called where object has its own lifecycle and child object cannot belong to another parent object?

• 1]

  Aggregation

• 2]

  Composition

• 3]

  Encapsulation

• 4]

  Association

Which of this keyword must be used to inherit a class?

• 1]

  super

• 2]

  this

• 3]

  extent

• 4]

  extends

What will be the output of the following Java program?

    class A 
    {
        public int i;
        public int j;
        A() 
        {
            i = 1;
            j = 2;
	}
    }    
    class B extends A 
    {
        int a;
        B() 
        {
            super();
        } 
    }    
    class super_use 
    {
        public static void main(String args[])
        {
            B obj = new B();
            System.out.println(obj.i + " " + obj.j)     
        }
   }

• 1]

  1 2
   

• 2]

  2 1

• 3]

  Runtime Error

• 4]

  Compilation Error

What will be the output of the following Java program?

    class A 
    {
        int i;
    }    
    class B extends A 
    {
        int j;
        void display() 
        {
            super.i = j + 1;
            System.out.println(j + " " + i);
        }
    }    
    class inheritance 
    {
        public static void main(String args[])
        {
            B obj = new B();
            obj.i=1;
            obj.j=2;   
            obj.display();     
        }
   }

• 1]

  2 2

• 2]

  3 3

• 3]

  2 3

• 4]

  3 2

What will be the output of the following Java program?

    class A 
    {
        int i;
        void display() 
        {
            System.out.println(i);
        }
    }    
    class B extends A 
    {
        int j;
        void display() 
        {
            System.out.println(j);
        }
    }    
    class inheritance_demo 
    {
        public static void main(String args[])
        {
            B obj = new B();
            obj.i=1;
            obj.j=2;   
            obj.display();     
        }
   }

• 1]

  0

• 2]

  1

• 3]

  2

• 4]

  Compilation Error

Which of these is correct way of inheriting class A by class B?

• 1]

  class B + class A {}

• 2]

  class B inherits class A {}

• 3]

  class B extends A {}

• 4]

  class B extends class A {}

 A class member declared protected becomes a member of subclass of which type?

• 1]

  public member

• 2]

  private member

• 3]

  protected member

• 4]

  static member

What is not type of inheritance?

• 1]

  Single inheritance

• 2]

  Double inheritance

• 3]

  Hierarchical inheritance

• 4]

   Multiple inheritance

Does Java support multiple level inheritance?

• 1]

  True

• 2]

  False

What would be the result if a class extends two interfaces and both have a method with same name and signature? Lets assume that the class is not implementing that method.

• 1]

  Runtime error

• 2]

  Compile time error

• 3]

  Code runs successfully

• 4]

  First called method is executed successfully

Which of the following is used in implementing inheritance through class?

• 1]

  inherited

• 2]

  using

• 3]

  extends

• 4]

  implements

Which of the following is used for implementing inheritance through an interface?

• 1]

  inherited

• 2]

  using

• 3]

  extends

• 4]

  implements

Static members are not inherited to subclass.

• 1]

  True

• 2]

  False

If super class and subclass have same variable name, which keyword should be used to use super class?

• 1]

  super

• 2]

  this

• 3]

  upper

• 4]

  classname

In order to restrict a variable of a class from inheriting to subclass, how variable should be declared?

• 1]

  Protected

• 2]

  Private

• 3]

  Public

• 4]

  Static

All classes in Java are inherited from which class?

• 1]

  java.lang.class

• 2]

  java.class.inherited

• 3]

  java.class.object

• 4]

  java.lang.object

Using which of the following, multiple inheritance in Java can be implemented?

• 1]

  Interfaces

• 2]

  Multithreading

• 3]

  Protected methods

• 4]

  Private methods

Which of the following is a type of polymorphism in Java?

• 1]

  Compile time polymorphism

• 2]

  Execution time polymorphism

• 3]

  Multiple polymorphism

• 4]

  Multilevel polymorphism

When does method overloading is determined?

• 1]

  At run time

• 2]

  At compile time

• 3]

  At coding time

• 4]

  At execution time

When Overloading does not occur?

• 1]

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

• 2]

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

• 3]

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

• 4]

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

Method overriding is combination of inheritance and polymorphism?

• 1]

  True

• 2]

  False

What is the process of defining a method in a subclass having same name & type signature as a method in its superclass?

• 1]

  Method overloading

• 2]

  Method overriding

• 3]

  Method hiding

• 4]

  None of the mentioned

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

• 1]

  static

• 2]

  constant

• 3]

  protected

• 4]

  final

Which of these is supported by method overriding in Java?

• 1]

  Abstraction

• 2]

  Encapsulation

• 3]

  Polymorphism

• 4]

  None of the mentioned

Which concept of Java is a way of converting real world objects in terms of class?

• 1]

  Polymorphism

• 2]

  Encapsulation

• 3]

  Abstraction

• 4]

  Inheritance

Which concept of Java is achieved by combining methods and attribute into a class?

• 1]

  Encapsulation

• 2]

  Inheritance

• 3]

  Polymorphism

• 4]

  Abstraction