Crowdly

SequenceInputStream

FileReader

FileWriter

PrintWriter

BufferedInputStream

DataOutputStream

Which of these class is used to read bytes in a file?

FileReader

InputStreamReader

FileInputStream

FileWriter

Which of these classes is used for input operation when working with bytes?

InputStream

All of the mentioned

Reader

Writer

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

scanf()

get()

read()

getInteger()

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

flush()

close()

clear()

fflush()

How an object can become serializable?

If a class or any superclass implements java.io.Serializable interface

Any object is serializable

If a class implements java.io.Serializable class

No object is serializable

What is serialization?

Turning object in memory into stream of bits

Turning object in memory into stream of bytes

Turning stream of bytes into an object in memory

Turning stream of bits into an object in memory

Which of these is a process of writing the state of an object to a byte stream?

File Filtering

Externalization

All of the mentioned

Serialization

What is the output of this program?

import java.io.*;

public class App {

public static void main(String[] args) {

String obj = "abc";

byte b[] = obj.getBytes();

ByteArrayInputStream obj1 = new ByteArrayInputStream(b);

for (int i = 0; i < 2; ++ i) {

int c;

while ((c = obj1.read()) != -1) {

if (i == 0) {

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

}

aaabbbccc

aaa

abcabcabc

abc