Programming in Java | Week 5
Session: JAN-APR 2024
Course name: Programming In Java
Course Link: Click Here
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These are NPTEL Programming In Java Week 5 Assignment 5 Answers
Q1. Which of the following is an incorrect statement about interfaces?
a. Interfaces specifies what class must do but not how it does.
b. Interfaces are specified public if they are to be accessed by any code in the program.
c. All variables in interface are implicitly final and static.
d. All variables are static and methods are public if interface is defined public.
Answer: d. All variables are static and methods are public if interface is defined public.
Q2. How do you access a static method of an interface?
a. Using the interface name
b. Using the method name directly
c. Through an object of the interface
d. Through an implementation class
Answer: a. Using the interface name
Q3. What is the output of the below Java program with an Interface?
a. 1000
b. 2000
c. Compiler error
d. None of the above
Answer: c. Compiler error
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These are NPTEL Programming In Java Week 5 Assignment 5 Answers
Q4. What happens when we access the same variable defined in two interfaces implemented by the same class?
a. Compilation failure
b. Runtime Exception
c. The JVM is not able to identify the correct variable
d. The interfaceName.variableName needs to be defined
Answer: d. The interfaceName.variableName needs to be defined
Q5. Predict the output of following Java program
a. Got the Test Exception
Inside finally block
b. Got the Test Exception
c. Inside finally block
d. Compiler Error
Answer: a. Got the Test Exception
Inside finally block
Q6. What happens if an exception is not caught in the catch block?
a. The finally block handles it
b. The exception is ignored
c. The exception is thrown to the caller method
d. The program terminates immediately
Answer: c. The exception is thrown to the caller method
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These are NPTEL Programming In Java Week 5 Assignment 5 Answers
Q7. What will be the output of the following Java program?
a. Hello
b. World
c. HelloWorld
d. Hello World
Answer: b. World
Q8. What is the output of the below Java code with Exceptions?
a. Index 4 out of bounds for length 3
b. Index 4 out of bounds for length 3
Some exception
c. Some exception
d. No exception occurs
Answer: a. Index 4 out of bounds for length 3
Q9. What is the output of the Java code with FINALLY block and RETURN statement?
a. inside TRY
b. inside TRY
inside FINALLY
c. inside FINALLY
d. Compiler error
Answer: b. inside TRY
inside FINALLY
Q10. What is the purpose of the finally block in Java exception handling?
a. To handle an exception
b. To catch an exception
c. To clean up resources after a try block
d. None of the above
Answer: c. To clean up resources after a try block
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Session: JULY-DEC 2023
Course Name: Programming In Java
Course Link: Click Here
These are NPTEL Programming In Java Week 5 Assignment 5 Answers
Programming Assignment
Question 1
An interface Number is defined in the following program. You have to declare a class A, which will implement the interface Number. Note that the method findSqr(n) will return the square of the number n.
Solution:
class A implements Number {
int i, square;
public int findSqr(int i) {
square=i*i;
return square;
}
}Question 2
This program is to find the GCD (greatest common divisor) of two integers writing a recursive function findGCD(n1,n2). Your function should return -1, if the argument(s) is(are) other than positive number(s).
Solution:
class B implements GCD {
int n1,n2;
public int findGCD(int n1, int n2){
if(n1==0&& n2==0) {
return -1;
}
else if(n2 == 0){
return n1;
}
else {
return findGCD(n2, n1%n2);
}
}
}These are NPTEL Programming In Java Week 5 Assignment 5 Answers
Question 3
Complete the code segment to catch the ArithmeticException in the following, if any. On the occurrence of such an exception, your program should print “Exception caught: Division by zero.” If there is no such exception, it will print the result of division operation on two integer values.
Solution:
int result;
a = input.nextInt();
b = input.nextInt();
try {
result = a/b;
System.out.print(result);
}
catch (ArithmeticException e) {
System.out.print("Exception caught: Division by zero.");
}Question 4
In the following program, an array of integer data to be initialized. During the initialization, if a user enters a value other than integer value, then it will throw InputMismatchException exception. On the occurrence of such an exception, your program should print “You entered bad data.” If there is no such exception it will print the total sum of the array.
Solution:
try
{
for(int i=0;i<length;i++)
{
int userInput=sc.nextInt();
name[i] = userInput;
sum=sum+name[i];
}
System.out.print(sum);
}
catch(InputMismatchException e)
{
System.out.print("You entered bad data.");
}These are NPTEL Programming In Java Week 5 Assignment 5 Answers
Question 5
In the following program, there may be multiple exceptions. You have to complete the code using only one try-catch block to handle all the possible exceptions.
For example, if user’s input is 1, then it will throw and catch “java.lang.NullPointerException“.
Solution:
try{
switch (i)
{
case 0 : int zero = 0;
j = 92/ zero;
break;
case 1 : int b[ ] = null;
j = b[0] ;
break;
default: System.out.print("No exception");
}
}
catch (Exception e)
{
System.out.print(e) ;
}These are NPTEL Programming In Java Week 5 Assignment 5 Answers
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Session: JAN-APR 2023
Course Name: Programming in Java
Course Link: Click Here
These are NPTEL Programming In Java Week 5 Assignment 5 Answers
Q1. Consider the following program.
If the program is executed, then what will be the output?
a. 22
b. 33
c. 23
d. 32
Answer: c. 23
Q2. Consider the following piece of code.
‘Which of the following statement(s) is/are true for the above code?
a. Itis an empty interface.
b. Itis a tag interface.
c. It is a marker interface.
d. Itis a nested interface.
Answer: a, b, c
These are NPTEL Programming In Java Week 5 Assignment 5 Answers
Q3. What is the output of the following code?
a. java
10
b. java
20
c. 10
java
d. 20
java
Answer: a. java
10
Q4. ‘Which of the following statement(s) is/are true?
a. All abstract methods defined in an interface must be implemented.
b. The variables defined inside an interface are static and final by default.
c. An interface is used to achieve full abstraction.
d. Inside an interface, a constructor can be called using the super keyword with hierarchy.
Answer: a, b, c
These are NPTEL Programming In Java Week 5 Assignment 5 Answers
Q5. Which of the following statement(s) is/are true?
1. A class can extend more than one class.
2. A class can extend only one class but many interfaces.
3. An interface can extend many interfaces.
4. An interface can implement many interfaces.
5. A class can extend one class and implement many interfaces.
a. 1 and 2
b. 2 and 4
c. 3 and 5
d. 3 and 4
Answer: c. 3 and 5
Q6. ‘Which of the following statement(s) is/are true?
a. Abstract class can have abstract and non-abstract methods.
b. Abstract class can have final, non-final, static and non-static vanables.
c. Interface has only static and final vaniables.
d. Interface can provide the implementation of an abstract class.
Answer: a, b, c
These are NPTEL Programming In Java Week 5 Assignment 5 Answers
Q7. Consider the following piece of code.
What is the output of the above code?
a. A
b. B
c. BC
d. AC
Answer: c. BC
Q8. The class at the top of exception class hierarchy is …………..
a. Object
b. Throwable
c. Exception
d. ArthmeticException
Answer: b. Throwable
These are NPTEL Programming In Java Week 5 Assignment 5 Answers
Q9. Which of these class is superclass of every class in Java?
a. Object class
b. Abstract class
c. String class
d AmayList class
Answer: a. Object class
Q10. If the program is executed, then what will be the output?
a. 012
b. 004
c. 024
d. 044
Answer: b. 004
Programming Assignment of Programming in Java
Question 1
Complete the code segment to catch the ArithmeticException in the following, if any. On the occurrence of such an exception, your program should print “Exception caught: Division by zero.” If there is no such exception, it will print the result of division operation on two integer values.
Solution:
int result;
a = input.nextInt();
b = input.nextInt();
try{
result = a/b;
System.out.println(result);
}
catch (ArithmeticException e){
System.out.println("Exception caught: Division by zero.");
}Question 2
In the following program, an array of integer data to be initialized. During the initialization, if a user enters a value other than integer value, then it will throw InputMismatchException exception. On the occurrence of such an exception, your program should print “You entered bad data.” If there is no such exception it will print the total sum of the array.
Solution:
try{
for(int i=0;i<length;i++){
int userInput=sc.nextInt();
name[i] = userInput;
sum=sum+name[i];
}
System.out.println(sum);
}
catch(InputMismatchException e){
System.out.println("You entered bad data.");
}These are NPTEL Programming In Java Week 5 Assignment 5 Answers
Question 3
In the following program, there may be multiple exceptions. You have to complete the code using only one try-catch block to handle all the possible exceptions.
For example, if user’s input is 1, then it will throw and catch “java.lang.NullPointerException“.
Solution:
try{
switch (i){
case 0 :
int zero = 0;
j = 92/ zero;
break;
case 1 :
int b[ ] = null;
j = b[0] ;
break;
default:
System.out.println("No exception");
}
}
catch (Exception e){
System.out.println(e);
}Question 4
An interface Number is defined in the following program. You have to declare a class A, which will implement the interface Number. Note that the method findSqr(n) will return the square of the number n.
Solution:
class A implements Number{
int i, square;
public int findSqr(int i){
square=i*i;
return square;
}
}These are NPTEL Programming In Java Week 5 Assignment 5 Answers
Question 5
This program is to find the GCD (greatest common divisor) of two integers writing a recursive function findGCD(n1,n2). Your function should return -1, if the argument(s) is(are) other than positive number(s).
Solution:
class B implements GCD{
int n1,n2;
public int findGCD(int n1, int n2){
if(n1==0&& n2==0){
return -1;
}
else if(n2 == 0){
return n1;
}
else{
return findGCD(n2, n1%n2);
}
}
}These are NPTEL Programming In Java Week 5 Assignment 5 Answers
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Session: JULY-DEC 2022
Course Name: Programming in Java NPTEL
These are NPTEL Programming In Java Week 5 Assignment 5 Answers
Q1. Consider the following program.
If the program is executed, then what will be the output from the execution?
a. 100
102
b. 20
22
C. 102
100
d. 22
20
Answer: a. 100 102
These are NPTEL Programming In Java Week 5 Assignment 5 Answers
Q2. Consider the following program.
If the program is executed, then what will be the output from the execution?
a. 170
b. 130
c. 0
d. 260
Answer: a. 170
These are NPTEL Programming In Java Week 5 Assignment 5 Answers
Q3. What is the output of the following code?
a. Output: This is Explanation’s Print method
This is Answer’s Print method
b. Error: super.super’ is not allowed.
c. Error: Compilation unsuccessful, as there is only one super class of Answer
d. Output: This is Answer’s Print method
This is Explanation’s Print method
Answer: b. Error: super.super’ is not allowed.
Q4. Which of the following is/are interface(s)?
a. DriverManager
b. Connection
c. Statement
d. ResultSet
Answer: b, c, d
These are NPTEL Programming In Java Week 5 Assignment 5 Answers
Q5. Which of the following statement(s) is/are true?
a. You can write a new instance method in the subclass that has the same signature as the one in the superclass, thus overriding it.
b. You can write a new static method in the subclass that has the same signature as the one in the superclass, thus hiding it.
c. A subclass inherits all of the public and protected members of its parent, no matter what package the subclass is in.
d. You cannot declare new methods in the subclass that are not in the superclass.
Answer: a, b, c
Q6. Which of the following statement(s) is/are true?
a. Static methods in interfaces are never inherited.
b. You will get a compile-time error if you attempt to change an instance method in the superclass to a static method in the subelass. /
c. You can prevent a class from being sub classed by using the final keyword in the class’s declaration.
d. An abstract class can only be subclassed; it cannot be instantiated.
Answer:a, b, c, d
These are NPTEL Programming In Java Week 5 Assignment 5 Answers
Q7. Consider the following piece of code:
Which of the following statement(s) is/are correct?
a. There is no main () method so the program is not compile successfully.
b. The value of i will be printed as 22, as it is static and final by default.
c. The value of I will be printed as 2. as it is initialized in class B.
d. Compile time error
Answer: a. There is no main () method so the program is not compile successfully.
Q8. Which of the following statement(s) is/are true?
a. A class can extend more than one class.
b. An interface can extend many interfaces.
c. An interface can implement many interfaces.
d. A class can extend one class and implement many interfaces.
Answer: b, d
These are NPTEL Programming In Java Week 5 Assignment 5 Answers
Q9. All classes in Java are inherited from which class?
a. java.lang.class
b. java.class.inherited
c. java.class.object
d. java.lang.Object
Answer: d
Q10. If the program is executed, then what will be the output from the execution?
a. Output: 1020
b. Output : 30
c. Output: 2010
d. Error: Cl is abstract; cannot be instantiated.
Answer: d
These are NPTEL Programming In Java Week 5 Assignment 5 Answers
Programming Assignment Solutions
Question 1
An interface Number is defined in the following program. You have to declare a class A, which will implement the interface Number. Note that the method findSqr(n) will return the square of the number n.
Solution:
//CodeThese are NPTEL Programming In Java Week 5 Assignment 5 Answers
Question 2
This program is to find the GCD (greatest common divisor) of two integers writing a recursive function findGCD(n1,n2). Your function should return -1, if the argument(s) is(are) other than positive number(s).
Solution:
//CodeThese are NPTEL Programming In Java Week 5 Assignment 5 Answers
Question 3
Complete the code segment to catch the ArithmeticException in the following, if any. On the occurrence of such an exception, your program should print “Exception caught: Division by zero.” If there is no such exception, it will print the result of division operation on two integer values.
Solution:
//CodeThese are NPTEL Programming In Java Week 5 Assignment 5 Answers
Question 4
In the following program, an array of integer data to be initialized. During the initialization, if a user enters a value other than integer value, then it will throw InputMismatchException exception. On the occurrence of such an exception, your program should print “You entered bad data.” If there is no such exception it will print the total sum of the array.
Solution:
//CodeThese are NPTEL Programming In Java Week 5 Assignment 5 Answers
Question 5
In the following program, there may be multiple exceptions. You have to complete the code using only one try-catch block to handle all the possible exceptions.
For example, if user’s input is 1, then it will throw and catch “java.lang.NullPointerException“.
Solution:
//CodeThese are NPTEL Programming In Java Week 5 Assignment 5 Answers
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