Online Random Test

Ques 1 :
Why @SupressWarning Annotation is used?

(A) To suppress exception issued by compiler

(B) To show warnings

(D) To suppress exception issued by compiler

Ques 2 :
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.)

(D) A thread inherits the priority of its parent thread.

Ques 3 :
What all gets printed when the following code is compiled and run. Select the three correct answers.
class test
{
public static void main(String args[])
{
int i[] = {0,1};
try
{
i[2] = i[0] + i[1];
}
   catch(ArrayIndexOutOfBoundsException e1)
{
System.out.println("1");
}
  catch(Exception e2)
  {
System.out.println("2");
  }
finally
  {
System.out.println(3);
  }
  System.out.println("4");
}
}

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

(A) 1 2 4

(B) 4

(D) 1 2 3

Ques 4 :
Which of these statements are true. Select the two correct answers.
a. For each try block there must be at least one catch block defined.
b. A try block may be followed by any number of finally blocks.
c. A try block must be followed by at least one finally or catch block.
d. If both catch and finally blocks are defined, catch block must precede the finally block.

(A) a, b

(B) c, d

(D) a, c

Ques 5 :
Which of the following statements are true. Select the one correct answer.

(A) Arrays in Java are essentially objects.

(B) It is not possible to assign one array to another. Individual elements of array can however be assigned

(D) If a method tries to access an array element beyond its range, a compile warning is generated.

Ques 6 :
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 7 : Which of the following are keywords in Java.

(A) implement

(B) friend

(D) synchronized

Ques 8 :
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 9 : Which of these are not legal identifiers.

(A) 1alpha

(B) xy+abc

(D) None of the above

Ques 10 :
Which of the following are Java keywords?

(A) throw

(B) void

(D) All of the above.

Ques 11 :
Which all lines are part of the output when the following code is compiled and run. Select the six correct answers.
public class test
{
public static void main(String args[])
{
for(int i = 0; i < 3; i++)
{
for(int j = 3; j >= 0; j--)
{
if(i == j) break;
System.out.println(i + " " + j);
}
}
}
}
a. 0 0
b. 0 1
c. 0 2
d. 0 3
e. 1 0
f. 1 1
g. 1 2
h. 1 3
i. 2 0
j. 2 1
k. 2 2
l. 2 3
m. 3 0
N. 3 1
O. 3 2
P. 3 3

(A) a, b, c, f, h, i

(B) c, d, g, h, i, k

(D) d, e, f, g, j, k

Ques 12 :
Which of the following is correct? Select the two correct answers.
a. The native keyword indicates that the method is implemented in another
language like C/C++.
b. The only statements that can appear before an import statement in a
Java file are comments.
c. The method definitions inside interfaces are public and abstract. They
cannot be private or protected.
d. A class constructor may have public or protected keyword before them,
nothing else.

(A) a, b

(B) a, c

(D) c, d

Ques 13 :
When a thread terminates its processing, into what state that thread enters?

(A) Dead state

(B) Waiting state

(D) Beginning state

Ques 14 :
Which of the following statements related to Garbage Collection are correct. Select the two correct answers.
a. It is possible for a program to free memory at a given time.
b. Garbage Collection feature of Java ensures that the program never runs out of memory.
c. It is possible for a program to make an object available for Garbage Collection.
d. The finalize method of an object is invoked before garbage collection is performed on the object.

(A) a, b

(B) b, d

(D) b, c

Ques 15 :
Which of the following statements is true?

(A) A super class is a sub set of a sub class

(B) class ClassTwo extends ClassOne means ClassOne is a subclass

(D) the class Class is the super class of all other classes in Java.

Ques 1 :
Why @SupressWarning Annotation is used?

Ques 2 :
What is the default priority of a newly created thread.?

Ques 5 :
Which of the following statements are true. Select the one correct answer.

Ques 7 : Which of the following are keywords in Java.

Ques 9 : Which of these are not legal identifiers.

Ques 10 :
Which of the following are Java keywords?

Ques 13 :
When a thread terminates its processing, into what state that thread enters?

Ques 15 :
Which of the following statements is true?

Ques 16 :
Which of these are legal identifiers. Select the three correct answers.
a. number_1
b. number_a
c. $1234
d. -volatile

Ques 17 :
What is the name of the Collection interface used to represent elements in a sequence (in a particular order). Select the one correct answer.

Ques 19 :
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);
}
}

Ques 20 :
What is the result of compiling and running the following program.
public class test {
public static void main(String args[]) {
String str1="abc";
String str2="def";
String str3=str1.concat(str2);

str1.concat(str2);
System.out.println(str1);
}
}