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Programming In Java

Nptel Programming in Java Week 7 Assignment Answers

Que. 1
What will be the output of the following Java program?

import java.io.*;
class ReadFile {
    public static void main(String[] args) throws IOException {
        FileReader fr = new FileReader("NPTEL.txt");
        BufferedReader br = new BufferedReader(fr);
        System.out.println(br.readLine());
        br.close();
    }
}

Assume NPTEL.txt contains:

a) Hello, World!
b) This is Programming in Java online course.
c) IOException
d) null

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Que. 2
Which of these classes is used to write primitive data types to an output stream in Java?

a) FileWriter
b) DataOutputStream
c) PrintWriter
d) BufferedOutputStream

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Que. 3
What will the following code print?

import java.io.*;

class RandomAccessFileExample {
    public static void main(String[] args) throws IOException {
        RandomAccessFile file = new RandomAccessFile("test.dat", "rw");
        file.writeInt(100);
        file.seek(0);
        System.out.println(file.readInt());
        file.close();
    }
}

a) 0
b) Runtime Error
c) Compilation Error
d) 100

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Que. 4
Complete the following snippet with the required code.

File file = new File("file.txt");
if ( _____ ) {
    System.out.println("File exists.");
} else {
    System.out.println("File does not exist.");
}

a) file.exists()
b) file.isFile()
c) file.fileExists()
d) file.isAvailable()

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Que. 5
What will the following Java program output?

import java.io.*;

class SequenceInputStreamExample {
    public static void main(String[] args) throws IOException {
        ByteArrayInputStream input1 = new ByteArrayInputStream("123".getBytes());
        ByteArrayInputStream input2 = new ByteArrayInputStream("ABC".getBytes());
        SequenceInputStream sequence = new SequenceInputStream(input1, input2);
        int i;
        while ((i = sequence.read()) != -1) {
            System.out.print((char) i);
        }
    }
}

a) 123ABC
b) ABC123
c) Compilation Error
d) Runtime Error

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Que. 6
What is the output of the following Java program?

class Main {
    public static void main(String args[]) {
        final int i;
        i = 20;
        i = 30;
        System.out.println(i);
    }
}

a) 30
b) Compiler Error
c) Garbage value
d) 0

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Que. 7
What will be the output of the following Java program?

import java.io.*;

class CharArrayInput {
    public static void main(String[] args) {
        String obj = "abcdefgh";
        int length = obj.length();
        char c[] = new char[length];
        obj.getChars(0, length, c, 0);
        CharArrayReader input1 = new CharArrayReader(c);
        CharArrayReader input2 = new CharArrayReader(c, 1, 4);
        int i, j;
        try {
            while ((i = input1.read()) == (j = input2.read())) {
                System.out.print((char) i);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

a) abc
b) abcd
c) abcde
d) none of the mentioned

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Que. 8
What will be the output of the following Java program?

public class Calculator {
    int num = 100;
    public void calc(int num) {
        this.num = num;
    }
    public void printNum() {
        System.out.println(num);
    }
    public static void main(String[] args) {
        Calculator obj = new Calculator();
        obj.calc(20);
        obj.printNum();
    }
}

a) 20
b) 100
c) 1000
d) 2

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Que. 9
What will be the output of the following code?

import java.io.*;

public class m7 {
    public static void main(String[] args) {
        try {
            PrintWriter writer = new PrintWriter(System.out);
            writer.write(9 + 97);
            writer.close();
        } catch (Exception e) {
            System.out.println(e);
        }
    }
}

a) It will give compile-time error
b) It will give run-time error
c) j
d) 106

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Que. 10
What will be the output of the following code?

Assume file.txt contains:
“This is Programming in Java online course.”

import java.io.File;

class FileSizeExample {
    public static void main(String[] args) {
        String filePath = "file.txt";
        File file = new File(filePath);
        long fileSize = file.length();
        System.out.println(fileSize);
    }
}

a) 42
b) 35
c) 7
d) 0

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