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COREJAVARANDOMTEST
Ques 1 :
Which of the following are Java keywords. Select the four correct answers.
a.
super
b.
strictfp
c.
void
d.
synchronize
e.
instanceof
(A) a, b
(B) a, b, c, e.
(C) b, c, d
(D) a, c, d, e
Ques 2 :
Which of the following are legal declaration and definition of a method. Select all correct answers.
a.
void method() {};
b.
void method(void) {};
c.
method() {};
d.
method(void) {};
e.
void method {};
(A) a,b
(B) a
(C) a,b,c
(D) b,d,e
Ques 3 :
What is the default priority of a newly created thread.?
(A) MIN_PRIORITY (which is defined as 1 in the Thread class.)
(B) NORM_PRIORITY (which is defined as 5 in the Thread class.)
(C) MAX_PRIORITY (which is defined as 10 in the Thread class.)
(D) A thread inherits the priority of its parent thread.
Ques 4 :
By which class we can read object from stream?
(A) Reader
(B) ObjectInputStream
(C) ObjectReader
(D) File
Ques 5 :
Which of the following are valid declarations for the main method. Select the three correct answers.
a.
public static void main(String args[]);
b.
public static void main(String []args);
c.
final static public void main (String args[]);
d.
public static int main(String args[]);
e.
public static abstract void main(String args[]);
(A) a, b, c
(B) b, d, e
(C) a, d, c
(D) a, b, e
Ques 6 :
class Test
{
public static void main(String [] args) throws Exception
{
Vector data = new Vector();
data.add("apple");
data.add("mango");
data.add("papaya");
data.add("cherry");
data.add("banana");
data.add("apple");
System.out.println(getData(data));
}
public static Vector getData(Vector v)
{
return new Vector(new HashSet(v));
}
}
What would be the output?
(A) Compile Error
(B) [banana, cherry, papaya, apple, mango]
(C) [banana, cherry, papaya, apple, mango]
(D) [banana, cherry, papaya, apple, apple, mango]
Ques 7 :
What happens when the following class is compiled and run. Select one correct answer.
public class test
{
public static void main(String args[])
{
int x = 0, y = 1, z;
if(x)
z = 0;
else
z = 1;
if(y)
z = 2;
else
z = 3;
System.out.println(z);
}
}
(A) The program prints 1
(B) The program prints 2
(C) The program prints 3
(D) The program does not compile because of problems in the if statement.
Ques 8 :
Which of the following is considered as a blue print that defines the variables and methods common to all of its objects of a specific kind?
(A) Object
(B) Class
(C) Method
(D) Real data types
Ques 9 :
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,d,c
(B) b,c,a
(C) d,e
(D) a,b
Ques 10 :
Which of these statements is true?
(A) AbstractSet extends Set
(B) LinkedList extends List
(C) HashSet extends AbstractSet
(D) WeakHashMap extends HashMap
Ques 11 :
Given a one dimensional array arr, what is the correct way of getting the number of elements in arr. Select the one correct answer.
(A) arr.length
(B) arr.length - 1
(C) arr.size
(D) arr.length()
Ques 12 :
What gets printed when the following code is compiled and run. Select the one correct answer.
public class test {
public static void main(String args[]) {
int i = 1;
do {
i--;
} while (i > 2);
System.out.println(i);
}
}
(A) 0
(B) 1
(C) 2
(D) -1
Ques 13 :
Which of the following are keywords in Java. Select the two correct answers.
a.
friend
b.
NULL
c.
implement
d.
synchronized
e.
throws
(A) d, e
(B) a, b
(C) a, b, c
(D) all of above
Ques 14 :
What gets printed when the following program is compiled and run? Select the one correct answer.
class xyz {
public static void main(String args[]) {
int i,j,k;
for (i = 0; i < 3; i++) {
for(j=1; j < 4; j++) {
for(k=2; k<5; k++) {
if((i == j) && (j==k))
System.out.println(i);
}
}
}
}
}
(A) 0
(B) 1
(C) 2
(D) 3
Ques 15 :
Which of the following are Java keywords?
(A) throw
(B) void
(C) private
(D) All of the above.
Ques 16 :
What will be the output of the program?
class Exc0 extends Exception { }
class Exc1 extends Exc0 { } /* Line 2 */
public class Test
{
public static void main(String args[])
{
try
{
throw new Exc1(); /* Line 9 */
}
catch (Exc0 e0) /* Line 11 */
{
System.out.println("Ex0 caught");
}
catch (Exception e)
{
System.out.println("exception caught");
}
}
}
(A) Ex0 caught
(B) exception caught
(C) Compilation fails because of an error at line 2.
(D) Compilation fails because of an error at line 9.
Ques 17 :
Which of the following are valid constructors within a class Test. Select the two correct answers.
a.
test() { }
b.
Test() { }
c.
void Test() { }
d.
private final Test() { }
e.
abstract Test() { }
f.
Test(Test t) { }
g.
Test(void) { }
(A) b, d
(B) c, f
(C) b, c
(D) b, f
Ques 18 :
What gets written on the screen when the following program is compiled and run. Select the one right answer.
public class test {
public static void main(String args[]) {
int i;
float f = 2.3f;
double d = 2.7;
i = ((int)Math.ceil(f)) * ((int)Math.round(d));
System.out.println(i);
}
}
(A) 4
(B) 5
(C) 6
(D) 9
Ques 19 :
The width in bits of double primitive type in Java is --. Select the one correct answer.
(A) The width of double is platform dependent
(B) 64
(C) 128
(D) 8
Ques 20 :
Which of these are Java keywords. Select the five correct answers
a.
TRUE
b.
volatile
c.
transient
d.
native
e.
interface
f.
then
g.
new
(A) b, d, f, g
(B) a, b, d, g
(C) b, c, d, e, g
(D) d, e, f, g
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