Online Random Test

Ques 1 :
Which code determines the int value data closer to, but not greater than, a double value b?

(A) Int data = (int) Math.floor(b);

(B) Int data = (int) Math.abs(b);

(D) Int data = (int) Math.min(b);

Ques 2 :
What gets printed when the following program is compiled and run? Select the one correct answer.

class test
{
static boolean check;
public static void main(String args[])
{
int i;
if(check == true)
i=1;
else
i=2;
if(i=2) i=i+2;
else i = i + 4;
System.out.println(i);
}
}

(A) 3

(B) 4

(D) The program does not compile because of the statement if(i=2)

Ques 3 : Which of these are not legal identifiers.

(A) 1alpha

(B) xy+abc

(D) None of the above

Ques 4 :
What would happen when the following is compiled and executed. Select the one correct answer.

public class Compare {
public static void main(String args[]) {
int x = 10, y;
if(x < 10)
y = 1;
if(x>= 10) y = 2;
System.out.println("y is " + y);
}
}

(A) The program compiles and prints y is 0 when executed.

(B) The program compiles and prints y is 1 when executed.

(D) The program does not compile complaining about y not being initialized.

Ques 5 :
What happens when the following code is compiled and run. Select the one correct answer.

for(int i = 1; i < 3; i++)
for(int j = 3; j >= 1; j--)
assert i!=j : i;

(A) The class compiles and runs, but does not print anything.

(B) The number 1 gets printed with AssertionError

(D) The number 3 gets printed with AssertionError

Ques 6 : What is the data type for the number 9.6352?

(A) float

(B) double

(D) Double

Ques 7 :
Which are true in case of interface?

(A) we can create object implementation to an interface

(B) all type of modifiers are allowed to an interface

(D) we can mark interface as final

Ques 8 :
Which of the following statements is true?

(A) The default char data type is a space( �?? �?? ) character.

(B) The default integer data type is �??long�?? and real data type is �??float�??

(D) The default integer data type is �??int�?? and real data type is �??float�??

Ques 9 :
What will be the output of the program?
public class X
{
public static void main(String [] args)
{
try
{
badMethod();
System.out.print("A");
}
catch (Exception ex)
{
System.out.print("B");
}
finally
{
System.out.print("C");
}
System.out.print("D");
}
public static void badMethod()
{
throw new Error(); /* Line 22 */
}
}

(A) BC is printed before exiting with an error

(B) Compilation fails.

(D) C is printed before exiting with an error message.

Ques 10 :
By which class we can read object from stream?

(A) Reader

(B) ObjectInputStream

(D) File

Ques 11 :
What gets displayed on the screen when the following program is compiled and run. Select the one correct answer.
public class test
{
public static void main(String args[])
{
int x;
x = -3 >> 1;
x = x >>> 2;
x = x << 1;
System.out.println(x);
}
}

(A) 7

(B) 23

(D) 2147483646

Ques 12 :
A program needs to store the name, salary, and age of employees in years. Which of the following data types should be used to create the Employee class. Select the three correct answers.
a. char
b. boolean
c. Boolean
d. String
e. int
f. double

(A) a,d,f

(B) a,e,f

(D) d,a,e

Ques 13 :
What all gets printed when the following gets compiled and run. Select the two correct answers.

public class test {
public static void main(String args[]) {
int i=1, j=1;
try {
i++;
j--;
if(i == j)
i++;
}
catch(ArithmeticException e) {
System.out.println(0);
}
catch(ArrayIndexOutOfBoundsException e) {
System.out.println(1);
}
catch(Exception e) {
System.out.println(2);
}
finally {
System.out.println(3);
}
System.out.println(4);
}
}

a. 0
b. 1
c. 2
d. 3
e. 4

(A) a, b

(B) b, c

(D) d, e

Ques 14 :
What happens when the following code is compiled and run. Select the one correct answer.

for(int i = 1; i < 3; i++)
for(int j = 3; j > i; j--)
assert i!=j {System.out.println(i); }

(A) The class compiles and runs, but does not print anything.

(B) The number 1 gets printed with AssertionError

(D) The number 2 gets printed with AssertionError

Ques 15 :
What gets displayed on the screen when the following program is compiled and run. Select the one correct answer.

public class test {
public static void main(String args[]) {
int x,y;
x = 1 & 7;
y = 3 ^ 6;
System.out.println(x + " " + y);
}
}

(A) 1 3

(B) 3 5

(D) 1 5

Ques 16 :
Which statement is true?

(A) ArrayList is a sub class of Vector

(B) HashTable is a sub class of Dictionary

(D) Vector is a subclass of Stack

Ques 17 : Is this True or False. In Java an abstract class cannot be sub-classed.

(A) True

(B) False

Ques 18 : What is the name of collection interface used to maintain non-unique elements in order.

(A) Set

(B) List

(D) SortedSet

Ques 19 :
What happens when the following code is compiled and run. Select the one correct answer.

for(int i = 1; i < 4; i++)
for(int j = 1; j < 4; j++)
if(i < j)
assert i!=j : i;

(A) The class compiles and runs, but does not print anything.

(B) The number 1 gets printed with AssertionError

(D) The number 3 gets printed with AssertionError

Ques 20 : What is the name of collection interface used to maintain mappings of keys to values.

(A) List

(B) Set

(D) Map