Online Random Test

Test Status

COREJAVARANDOMTEST

Ques 1 : What is an aggregate object?

(A) An object with only primitive attributes

(B) An instance of a class which has only static methods

(D) None of the above

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

class test {
public static void main(String args[]) {
int i,j,k,l=0;
k = l++;
j = ++k;
i = j++;
System.out.println(i);
}
}

(A) 0

(B) 1

(D) 3

Ques 3 : 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

(D) arr.length()

Ques 4 :
What should be done to invoke the run() method on a thread for an object derived from the Thread class. Select the one correct answer.

(A) The run() method should be directly invoked on the Object.

(B) The start() method should be directly invoked on the Object.

(D) The creation of the object using the new operator would create a new thread and invoke its run() method.

Ques 5 :
What happens when the following program is compiled and run. Select the one correct answer.
public class example
{
int i[] = {0};
public static void main(String args[])
{
int i[] = {1};
change_i(i);
System.out.println(i[0]);
}
public static void change_i(int i[])
{
i[0] = 2;
i[0] *= 2;
}
}

(A) The program prints 0

(B) The program prints 1.

(D) The program prints 4.

Ques 6 :
What gets displayed on the screen when the following program is compiled and run. Select the one correct answer.

protected class example {
public static void main(String args[]) {
String test = "abc";
test = test + test;
System.out.println(test);
}
}

(A) The class does not compile because the top level class cannot be protected.

(B) The program prints "abc"

(D) The program does not compile because statement "test = test + test" is illegal.

Ques 7 :
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 8 :
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 9 :
After the following code fragment, what is the value in fname?

String str;
int fname;
str = "Foolish boy.";
fname = str.indexOf("fool");

(A) 0

(B) 2

(D) 4

Ques 10 :
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);
}
}

(A) def

(B) abc

(D) abcdef

Ques 11 :
Which statement about static inner class is true?

(A) A static inner class does not require an instance of the enclosing class.

(B) A static inner class cannot be a static member of outer class.

(D) It�??s variables and methods must be static.

Ques 12 :
Which all lines are part of the output when the following code is compiled and run. Select the one correct answer.
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) continue;
System.out.println(i + " " + j);
}
}
}
}

(A) 1 2

(B) 1 3

(D) The program does not print anything.

Ques 13 :
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 = 5 >> 2;
y = x >>> 2;
System.out.println(y);
}
}

(A) 5

(B) 2

(D) 0

Ques 14 :
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 15 : What is the name of collection interface used to maintain unique elements.

(A) List

(B) Set

(D) All of above

Ques 16 :
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 17 : What is the number of bytes used by Java primitive long. Select the one correct answer.

(A) The number of bytes is compiler dependent.

(B) 2

(D) 8

Ques 18 :
What is the number displayed when the following program is compiled and run.

class test {
public static void main(String args[]) {
test test1 = new test();
System.out.println(test1.xyz(100));
}
public int xyz(int num) {
if(num == 1) return 1;
else return(xyz(num-1) + num);
}
}

(A) 4040

(B) 5050

(D) 5055

Ques 19 :
Select the one correct answer. Which method defined in Integer class can be used to convert an Integer object to primitive int type.

(A) valueOf

(B) intValue

(D) getInteger

Ques 20 :
When a thread terminates its processing, into what state that thread enters?

(A) Dead state

(B) Waiting state

(D) Beginning state

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