MCQs
Total Questions : 97
| Page 3 of 10 pages
Answer: Option A. -> {0, 1, 3, 4}
None.
Output:
$ javac Bitset.java
$ java Bitset
{0, 1, 3, 4}
Answer: Option D. -> Objects instantiated within anonymous inner classes are placed in the garbage collectible heap.
All objects are placed in the garbage collectible heap.
Option A is incorrect because the garbage collector makes no guarantees.
Option B is incorrect because islands of isolated objects can exist.
Option C is incorrect because finalize() has no such mystical powers.
Question 23.
class area {
int width;
int length;
int area;
void area(int width, int length) {
this.width = width;
this.length = length;
}
}
class Output {
public static void main(String args[])
{
area obj = new area();
obj.area(5 , 6);
System.out.println(obj.length + " " + obj.width);
}
}
What is the output of this program?
class area {
int width;
int length;
int area;
void area(int width, int length) {
this.width = width;
this.length = length;
}
}
class Output {
public static void main(String args[])
{
area obj = new area();
obj.area(5 , 6);
System.out.println(obj.length + " " + obj.width);
}
}
Answer: Option C. -> 6 5
this keyword can be used inside any method to refer to the current object. this is always a
reference to the object on which the method was invoked.
output:
$ javac Output.java
$ java Output
6 5
Answer: Option D. -> Garbage value
Object obj of box class contains reference to the memory which was given to its class
instances. Printing obj will print the address of the memory.
output:
$ javac mainclass.java
$ java mainclass
box@130671e
Answer: Option A. -> {0, 1, 3, 4}
None.
Output:
$ javac Bitset.java
$ java Bitset
{0, 1, 3, 4}
Answer: Option B. -> 0 to 65535
The char type is integral but unsigned. The range of a variable of type char is from 0 to
216-1 or 0 to 65535. Java characters are Unicode, which is a 16-bit encoding capable of
representing a wide range of international characters. If the most significant nine bits of
a char are 0, then the encoding is the same as seven-bit ASCII.
Answer: Option B. -> [C=8, B=2]
None.
Output:
$ javac hashtable.java
$ java hashtable
{C=8, B=2}
Question 28.
import java.util.*;
class Collection_Algos {
public static void main(String args[]) {
LinkedList list = new LinkedList();
list.add(new Integer(2));
list.add(new Integer(8));
list.add(new Integer(5));
list.add(new Integer(1));
Iterator i = list.iterator();
Collections.reverse(list);
Collections.shuffle(list);
while(i.hasNext())
System.out.print(i.next() + " ");
}
}
What is the output of this program?
import java.util.*;
class Collection_Algos {
public static void main(String args[]) {
LinkedList list = new LinkedList();
list.add(new Integer(2));
list.add(new Integer(8));
list.add(new Integer(5));
list.add(new Integer(1));
Iterator i = list.iterator();
Collections.reverse(list);
Collections.shuffle(list);
while(i.hasNext())
System.out.print(i.next() + " ");
}
}
Answer: Option D. -> Any random order
shuffle - randomizes all the elements in a list.
Output:
$ javac Collection_Algos.java
$ java Collection_Algos
1 5 2 8
(output will be different on your system)
Answer: Option A. -> 1
When we assign an object to another object of same type, all the elements of right side
object gets copied to object on left side of equal to, =, operator.
output:
$ javac mainclass.java
$ java mainclass
1
Answer: Option D. -> Objects that can be reached from a live thread will never be garbage collected.
Option D is correct.
Option C is wrong. See the note above on Islands of Isolation (An object is eligible for garbage
collection when no live thread can access it - even though there might be references to it).
Option B is wrong. "Never again be used" does not mean that there are no more references to
the object.
Option A is wrong. Even though Java applications can run out of memory there another answer
supplied that is more right.
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