Java File Input and Output Questions and Answers

1. Which of these stream contains the classes which can work on character stream?

[A] InputStream

[B] OutputStream

[C] Character Stream

[D] All of the mentioned

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2. Which of these class is used to read characters in a file?

[A] FileReader

[B] FileWriter

[C] FileInputStream

[D] InputStreamReader

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3. Which of these method of FileReader class is used to read characters from a file?

[A] read()

[B] scanf()

[C] get()

[D] getInteger()

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4. Which of these class can be used to implement input stream that uses a character array as the source?

[A] BufferedReader

[B] FileReader

[C] CharArrayReader

[D] FileArrayReader

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5. Which of these is a method to clear all the data present in output buffers?

[A] clear()

[B] flush()

[C] fflush()

[D] close()

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6. Which of these classes can return more than one character to be returned to input stream?

[A] BufferedReader

[B] Bufferedwriter

[C] PushbachReader

[D] CharArrayReader

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7. 7. What is the output of this program?

    

 import java.io.*;

    class filesinputoutput {

        public static void main(String args[]) {

            InputStream obj = new FileInputStream("inputoutput.java");

            System.out.print(obj.available());

        }

    }

Note: inputoutput.java is stored in the disk.

[A] true

[B] false

[C] prints number of bytes in file

[D] prints number of characters in the file

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8. What is the output of this program?



    import java.io.*;

    class Chararrayinput {

        public static void main(String[] args) {

	    String obj  = "abcdef";

            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, 0, 3);

            int i;

            try {

		while ((i = input1.read()) != -1) {

                    System.out.print((char)i);

                }

       	    } 

            catch (IOException e) {

	        // TODO Auto-generated catch block

                e.printStackTrace();

	    }

	}

    }

[A] abc

[B] abcd

[C] abcde

[D] abcdef

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9. What is the output of this program?

  

  import java.io.*;

    class Chararrayinput {

        public static void main(String[] args) {

	    String obj  = "abcdef";

            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, 0, 3);

            int i;

            try {

		while ((i = input2.read()) != -1) {

                    System.out.print((char)i);

                }

       	    } 

            catch (IOException e) {

	        // TODO Auto-generated catch block

                e.printStackTrace();

	    }

	}

    }

[A] abc

[B] abcd

[C] abcde

[D] abcdef

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10. What is the output of this 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;

            int j;

            try {

		while ((i = input1.read()) == (j = input2.read())) {

                    System.out.print((char)i);

                }

       	    } 

            catch (IOException e) {

	        // TODO Auto-generated catch block

                e.printStackTrace();

	    }

	}

    }

[A] abc

[B] abcd

[C] abcde

[D] None of the mentioned

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Java File Input and Output Questions and Answers

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