Programming in Java | Week 7
Session: JAN-APR 2023
Course Name: Programming in Java
Course Link: Click Here
These are NPTEL Programming In Java Week 7 Assignment 7 Answers
Q1. Which of these is a type of IO stream in Java?
a. Integer stream
b. Short stream
c. Byte stream
d. Character stream
Answer: c, d
Q2. Which of the following is a class in java.io package?
a. FileReader
b. ObjectInput
c. ObjectOutput
d. Datalnput
Answer: a. FileReader
These are NPTEL Programming In Java Week 7 Assignment 7 Answers
Q3. Consider the following program.
What will be the output if the above program is executed?
a. It will give compile-time error.
b. B
c. 66
d. r
Answer: d. r
Q4. Consider the following program.
What is the output of the above code?
a. java/programm/2023
b. java’programm/
c. java
d. 2023
Answer: d. 2023
These are NPTEL Programming In Java Week 7 Assignment 7 Answers
Q5. Which method is used to read b length bytes from the input stream into an array?
a. public void read(int b)throws IOException { {
b. public int read(byte[ ] b)throws IOException {}
c. public void read(byte[ ] b)throws IOException {}
d. public int read(int b)throws IOException {}
Answer: b. public int read(byte[ ] b)throws IOException {}
Q6. How many standard streams Java can support?
a. 2
b. 3
c 4
d. 1
Answer: b. 3
These are NPTEL Programming In Java Week 7 Assignment 7 Answers
Q7. Which of the following stream is different from others?
a. System.in
b. System.out
c. PrintStream
d. FileOutputStream
Answer: a. System.in
Q8. Which of the following is used to read a string from the input stream?
a. get()
b. readLine( )
c. getLine( )
d. read()
Answer: d. read()
These are NPTEL Programming In Java Week 7 Assignment 7 Answers
Q9. Which of the following class(es) can be used for handling files in Java?
a. java files
b. java.io.File
c. java.io
d. java Filehandling
Answer: b. java.io.File
Q10. Which of the following statement(s) is/are true?
a. The default delimiters for a Scanner object are the white space characters.
b. The Scanner class has instance methods for reading each of the Java primitive types except char.
c. The Scanner methods do not throw any checked exceptions.
d. The Scanner class can be found in the java.util package.
Answer: a, b, d
Programming Assignment of Programming in Java
Question 1
A byte char array is initialized. You have to enter an index value”n”. According to index your program will print the byte and its corresponding char value.
Complete the code segment to catch the exception in the following, if any. On the occurrence of such an exception, your program should print “exception occur” .If there is no such exception, it will print the required output.
Solution:
String s2 = new String(barr,n,1);
System.out.println(barr[n]);
System.out.println(s2);
}Question 2
The following program reads a string from the keyboard and is stored in the String variable “s1”. You have to complete the program so that it should should print the number of vowels in s1 . If your input data doesn’t have any vowel it will print “0”.
Solution:
for(int i=0;i<s1.length();i++){
char s2=s1.charAt(i);
if(s2=='e' || s2=='E'|| s2=='a' || s2=='A' || s2=='i' || s2=='I' || s2=='o' || s2=='O' || s2=='u' || s2=='U')
{
c=c+1;
}
}These are NPTEL Programming In Java Week 7 Assignment 7 Answers
Question 3
A string “s1” is already initialized. You have to read the index “n” from the keyboard. Complete the code segment to catch the exception in the following, if any. On the occurrence of such an exception, your program should print “exception occur” .If there is no such exception, your program should replace the char “a” at the index value “n” of the “s1” ,then it will print the modified string.
Solution:
byte[] barr=s1.getBytes();
byte b1 = (byte) c;
barr[n]=b1;
System.out.println(new String(barr));
}Question 4
Complete the following code fragment to read three integer values from the keyboard and find the sum of the values. Declare a variable “sum” of type int and store the result in it.
Solution:
import java.util.*;
public class Question1
{
public static void main (String[] args)
{
int i,n=0,sum=0;
Scanner inr = new Scanner(System.in);
for (i=0;i<3;i++)
{
n = inr.nextInt();
sum =sum+n;
}These are NPTEL Programming In Java Week 7 Assignment 7 Answers
Question 5
Complete the code segment to catch the exception in the following, if any. On the occurrence of such an exception, your program should print “Please enter valid data” .If there is no such exception, it will print the “square of the number”.
Solution:
try{
InputStreamReader r=new InputStreamReader(System.in);
BufferedReader br=new BufferedReader(r);
String number=br.readLine();
int x = Integer.parseInt(number);
System.out.println(x*x);
}
catch (Exception e)
{
System.out.println("Please enter valid data");
}These are NPTEL Programming In Java Week 7 Assignment 7 Answers
More Weeks of Programming In Java: Click Here
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Session: JULY-DEC 2022
Course Name: Programming in Java NPTEL
These are NPTEL Programming In Java Week 7 Assignment 7 Answers
1) Which of these is method for testing whether the specified element is a file or a directory?
a. IsFile()
b. isFile()
c. Isfile()
d. isfile()
Answer: b. isFile()
2) Which of the following is/are NOT Standard Stream(s)?
a. System.in
b. System.out
c. System.err
d. System.console
Answer: d. System.console
3) What will be the output of the Java code?
a. NPTEL
b. NPTEL/JULY/2022
c. /NPTEL/JULY/2022
d. 2022
Answer: d. 2022
These are NPTEL Programming In Java Week 7 Assignment 7 Answers
4) What will be the output if the above program is executed?
a. It will give compile-time error
b. It will give run-time error
c. j
d. 106
Answer: d. 106
5) Which method is used to write a byte to the current output stream?
a. public void write(int b)throws IOException
b. public void write(byte[] b)throws IOException
c. public void flush()throws IOException
d. public void close() throws IOException
Answer: b. public void write(byte[] b)throws IOException
6) Which method of Random AccessFile class reads a line from the file and returns String ?
a. WriteInt()
b. readLine()
c. readInt()
d. WriteDouble()
Answer: b. readLine()
These are NPTEL Programming In Java Week 7 Assignment 7 Answers
7) Which of these class is not a member class of java.io package?
a. File
b. PrintStream
c. StringReader
d. Stream
Answer: d. Stream
8) Which of the following is/are interface(s) of java.io package?
a. FileReader
b. File Writer
c. DataOutput
d. DataInput
Answer: c, d
9) In which Java APIs the classes for handling all IO-streams are defined?
a. java.lang
b. java.util
c. java.io
d. java.awt
Answer: c. java.io
These are NPTEL Programming In Java Week 7 Assignment 7 Answers
10) Consider the following program.
If the program is executed, then what will be the output from the execution?
a. length : 6
b. length : 5
c. length : 0
d. length : 1
Answer: b. length : 5
Programming Assignment Solutions
Question 1
Complete the following code fragment to read three integer values from the keyboard and find the sum of the values. Declare a variable “sum” of type int and store the result in it.
Solution:
//CodeThese are NPTEL Programming In Java Week 7 Assignment 7 Answers
Question 2
Complete the code segment to catch the exception in the following, if any. On the occurrence of such an exception, your program should print “Please enter valid data” .If there is no such exception, it will print the “square of the number”.
Solution:
//CodeThese are NPTEL Programming In Java Week 7 Assignment 7 Answers
Question 3
A byte char array is initialized. You have to enter an index value”n”. According to index your program will print the byte and its corresponding char value.
Complete the code segment to catch the exception in the following, if any. On the occurrence of such an exception, your program should print “exception occur” .If there is no such exception, it will print the required output.
Solution:
//CodeThese are NPTEL Programming In Java Week 7 Assignment 7 Answers
Question 4
The following program reads a string from the keyboard and is stored in the String variable “s1”. You have to complete the program so that it should should print the number of vowels in s1 . If your input data doesn’t have any vowel it will print “0”.
Solution:
//CodeThese are NPTEL Programming In Java Week 7 Assignment 7 Answers
Question 5
A string “s1” is already initialized. You have to read the index “n” from the keyboard. Complete the code segment to catch the exception in the following, if any. On the occurrence of such an exception, your program should print “exception occur” .If there is no such exception, your program should replace the char “a” at the index value “n” of the “s1” ,then it will print the modified string.
Solution:
//CodeThese are NPTEL Programming In Java Week 7 Assignment 7 Answers
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