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Objects and Classes Questions

NA
SHSTTON
16
Solv. Corr.
46
Solv. In. Corr.
62
Attempted
0 M:58 S
Avg. Time

21 / 30

Choose the correct option.

What is the output for the below code?

import javutil.LinkedList;
import javutil.Queue;
public class Test {
public static void main(String... args) {
Queue q = new LinkedList();
q.add("newyork");
q.add("ca");
q.add("texas");
show(q);
}
public static void show(Queue q) {
q.add(new Integer(1);
while (!q.isEmpty ( ) )
System.out.print(q.poll() + " ");
}
}


ACompile error : Integer can't add

Bnewyork ca texas 11

Cnewyork ca texas

DNone of the above

Answer: Option B

Explanation:

" q was originally declared as Queue, But in show() method it is passed as an untyped Queue. nothing in the compiler or JVM prevents us from adding an Integer after that. If the show method signature is public static void show(Queue q) than you
can't add Integer, Only String allowed. But public static void show(Queue q) is untyped Queue so you can add Integer. Y poll() Retrieves and removes the head of this queue, or returns null if this queue is empty.

Workspace

NA
SHSTTON
37
Solv. Corr.
38
Solv. In. Corr.
75
Attempted
0 M:0 S
Avg. Time

22 / 30

Choose the correct option.

Consider the following code. What is the Output:

public class StaticTest {
static {
System.out.println("Planet");
}
public static void main(String argv[]) {
}
static {
System.out.print("Welcome");
}
}


APlanet

BPlanet Welcome

CWelcome

DNone

Answer: Option B

Explanation:

Here is no explanation for this answer

Workspace

NA
SHSTTON
121
Solv. Corr.
214
Solv. In. Corr.
335
Attempted
0 M:7 S
Avg. Time

23 / 30

Choose the correct option.

What is the output ?

public class Test {
public static void main(String... args) {
Pattern p = Pattern.compile("a+b?c*");
Matcher m = p.matcher("ab");
boolean b = m.matches();
System.out.println(b);
}
}


ATRUE

BFALSE

CCompile error

DNone of the above

Answer: Option A

Explanation:

X? X, once or not at all X* X, zero or more times X+ X, one or more times

Workspace

NA
SHSTTON
26
Solv. Corr.
29
Solv. In. Corr.
55
Attempted
0 M:27 S
Avg. Time

24 / 30

Choose the correct option.

class A {
A(String s) {
}
A() {
}
}
class B extends A {
B() { }
B(String s) {
super(s);
}
void test() {
// insert code here
}
}
Which of the below code can be insert at line 7 to make clean compilation ?


AA a = new B();

BA a = new B(5);

CA a = new A(String s);

DAll of the above

Answer: Option A

Explanation:

A a = new B(); is correct because anonymous inner classes are no different from any other class when it comes to polymorphism.

Workspace

NA
SHSTTON
11
Solv. Corr.
32
Solv. In. Corr.
43
Attempted
0 M:0 S
Avg. Time

25 / 30

Choose the correct option.

What is the output for the below code ?

public class A {
public void printValue(){
System.out.println("A");
}
}
public class B extends A {
public void printValue(){
System.out.println("B");
}
}
1. public class Test {
2. public static void main(String... args) {
3. A b = new B();
4. newValue(b);
5. }
6. public static void newValue(A {
7. if(a instanceof B){
8. ((B).printValue();
9. }
10. }
11. }


AA

BB

CCompilation fails with an error at line 4

DCompilation fails with an error at line 8

Answer: Option B

Explanation:

instanceof operator is used for object reference variables to check whether an object is of a particular type. In newValue(b); b is instance of B So works properly.

Workspace

NA
SHSTTON
29
Solv. Corr.
15
Solv. In. Corr.
44
Attempted
0 M:0 S
Avg. Time

26 / 30

Choose the correct option.

The benefits of object-oriented modeling are which of the following?


AThe ability to tackle more challenging problems

BReusability of analysis, design, and programming results

CImproved communication between users, analysts, et

DAll of the above.

Answer: Option D

Explanation:

Here is no explanation for this answer

Workspace

NA
SHSTTON
31
Solv. Corr.
25
Solv. In. Corr.
56
Attempted
0 M:0 S
Avg. Time

27 / 30

Choose the correct option.

What is the output for the below code ?

public class Test {
static int i =5;
public static void main(String... args) {
System.out.println(i++);
System.out.println(i);
System.out.println(++i);
System.out.println(++i+i++);

}
}


A5 6 7 16

B6 6 6 16

C6 6 7 16

D5 6 6 16

Answer: Option A

Explanation:

i++ : print value then increment (postfix - increment happens after the value of the variable is used) ++i : increment the print (prefix - increment happens before the value of the variable is used

Workspace

NA
SHSTTON
14
Solv. Corr.
56
Solv. In. Corr.
70
Attempted
0 M:0 S
Avg. Time

28 / 30

Choose the correct option.

What gets printed when the following code is compiled and run with the following command –
java test 2
Select the one correct answer.

public class test {
public static void main(String args[]) {
Integer intObj=Integer.valueOf(args[args.length–1]);
inti = intObj.intValue();
if(args.length> 1)
System.out.println(i);
if(args.length> 0)
System.out.println(i – 1);
else
System.out.println(i – 2);
}
}


A    test

B    test -1

C    0

D   1

E    2

Answer: Option D

Explanation:

Note that the program gets one command line argument – 2. args.length will get set to 1. So the condition if(args.length > 1) will fail, and the second check if(args.length > 0) will return true.

Workspace

NA
SHSTTON
24
Solv. Corr.
78
Solv. In. Corr.
102
Attempted
0 M:0 S
Avg. Time

29 / 30

Choose the correct option.

Assume that class A extends class B, which extends class C. Also all the three classes implement the method test(). How can a method in a class A invoke the test() method defined in class C (without creating a new instance of class C). Select the one correct answer.


Atest();

Bsuper.test();

Csuper.super.test();

D::test();

EF. It is not possible to invoke test() method defined in C from a method in A.

Answer: Option E

Explanation:

Here is no explanation for this answer

Workspace

NA
SHSTTON
16
Solv. Corr.
26
Solv. In. Corr.
42
Attempted
0 M:0 S
Avg. Time

30 / 30

Choose the correct option.

class HappyGarbage01
{
public static void main(String args[])
{
HappyGarbage01 h = new HappyGarbage01();
h.methodA(); /* Line 6 */
}
Object methodA()
{
Object obj1 = new Object();
Object [] obj2 = new Object[1];
obj2[0] = obj1;
obj1 = null;
return obj2[0];
}
}
Where will be the most chance of the garbage collector being invoked?


AAfter line 9

BAfter line 10

CAfter line 11

DGarbage collector never invoked in methodA()

Answer: Option D

Explanation:

Garbage collection takes place after the method has returned its reference to the object. The method returns to line 6, there is no reference to store the return value. so garbage collection takes place after line 6.

Workspace

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