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Final Exam COP 3337 Questions with Correct Answers
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Final Exam COP 3337 Questions with Correct Answers
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Final Exam COP 3337 Questions withCorrect Answers
A class can implement more than one interface?
a) True
b) False - Answer-a) True
Which of the following is true about the interfaces in java.
1. An interface can contain following type of members.
...public, static, final fields (i.e., constants)
...default and static methods with bodies
2. An instance of interface can be created.
3. A class can implement multiple interfaces
4. Many classes can implement the same interface - Answer-a) 1,3 and 4
Which of the following can not be a member of an interface?
a) Non Static Data Members
b) Static Methods
c) Constructors
d) All in the answer list - Answer-d) All in the answer list
When a class implements an interface, it need to ____ all the interfaces methods?
a) Overload
b) Override - Answer-b) Override
Which of the following is true about anonymous inner classes?
a. You can create 'n' number of objects to anonymous inner classes
b. Anonymous inner classes will not have the name
c. You can instantiate anonymous inner classes only once - Answer-c) Both B and c are
true
What is the ArrayList nums if it is initially [5,3,1] and the following code is executed?
Nums.add(6);
Nums.add(0,4); Nums.remove(1); - Answer-d) [4,3,1,6]
Which of the following points is/are true about linked list data structure when it is
compared with array
a. It is easy to insert and delete elements in linked list
b. Random access is not allowed in a typical implementation of Linked Lists
,c. The size of array has to be pre-decided, linked lists can change their size any time
d. All are true - Answer-d) All are true
Which statement is true about a static nested class?
a) It must extend the enclosing class
b) You must have a reference to an instance of the enclosing class in order to
instantiate it
c) Its variables and methods must be static
d) It does not have access to nonstatic members of the enclosing class - Answer-d) It
does not have access to nonstatic members of the enclosing class
Match the definitions with their suitable terms
a) The last item that is added is the first item that is removed (LIFO)
b) The first item that is added is the first term that is removed (FIFO)
c) Can use a circular array for its implementation
d) An ordered set of data elements, each containing a link to its successor (and
sometimes its
predecessor)
e) _______, increases the list by 100% when another element is added if the list is full
f) It is an inner class without a name and for which only a single object is created -
Answer-a) stack
b) queue
c) Queue
d) Linked List
e) Vector List
f) Anonymous Class
Predict the output of the following code
public class Quiz4 {public static int fun(int n) {
if (n==4)else return 2*fun(n+1);
}
public static void main(String[] args) { System.out.println(fun(2));}
} - Answer-b) 16
Consider the following recursive function fun(x,y). What is the value of fun(4,3)
public static int fun(int x, int y) {
if (x==0)
return y;
return y;
return fun(x-1, x+y);
} - Answer-b) 13
What does the following function print for n=25?
public static void fun(int n) {
if (n==0) return;
, System.out.print(n%2); fun(n/2); - Answer-b) 10011
Which line will cause an error
public interface A { final int k=8; private int m;
String fun(char s);
} - Answer-d) Line 2
which statement is correct?
public interface L { public void go();
}
class M {public void go() {
//Line 1
if (x==0) return y;
return fun(x - 1, x + y);
12) What does the following function print for n=25?
public static void fun(int n) {
if (n==0) return;
System.out.print(n%2); fun(n/2);
//Line 2 public void aMethod(); //Line 3
System.out.println("GO!");
//Line 4
}}
class N extends M implements L{}
public class A{public static void main(String[] args) {
N a = new N();
a.go(); }
} - Answer-c) this will print GO!
will this compile?
interface A{int n = 111;
}
class B implements A{ void inc() {
n++; }
} - Answer-a) True
Given the following code, what is the result?
public class Quiz4 {static class Char { //line 1
char c;public Char(char c) {
this.c = c; public void print() {
System.out.print(c);
}}
private static void typeText(Char c) { c.print();
}
public static void main(String[] args) { typeText(new Char('A'));
typeText(new Char('B'){
a) compile error as class N does not override go method
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