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Core Java - Interview Questions and Answers for 'File io' - 11 question(s) found - Order By Rating | ||||
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Ans. Which group of bytes represent which character is defined by character encoding. So when reading character by character from a stream of bytes using Reader, specifying character encoding becomes significant as the same group of bytes can represent different character in different character encoding(Eg UTF-8 and UTF-16 etc.) | ||||
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Like Discuss Correct / Improve  File io  File handling  Reader  Writer  Stream Asked in 1 Companies | ||||
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Ans. import java.util.ArrayList; import java.util.Arrays; import java.util.List; import java.io.*; public class Common { public static void main(String ar[])throws Exception { File f=new File("a.txt"); File f1=new File("x.java"); System.out.println(f.exists()); FileInputStream fin = new FileInputStream(f); FileInputStream fin1 = new FileInputStream(f1); byte b[]=new byte[10000]; byte b1[]=new byte[10000]; fin.read(b); fin1.read(b1); String s1 = new String(b); String s2 =new String(b1); String words1[] = s1.trim().split(" "); String words2[] = s2.trim().split(" "); Listlist1 = new ArrayList<>(Arrays.asList(words1)); Listlist2 = new ArrayList<>(Arrays.asList(words2)); list1.retainAll(list2); System.out.println(list1); } } | ||||
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Like Discuss Correct / Improve  file handling  file io  code  coding Asked in 1 Companies | ||||
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Ans. Buffer is cleared in 2 circumstances, i.e 1. naturally when the buffer is filled and 2. explicitly when the method flush is called ( for flushing the residual ) Ideally we just need to call flush once at the end of file writing so that the residual content should be dumped to file. | ||||
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Like Discuss Correct / Improve  BufferedWriter  Writer  PrintWriter  File io  flush  file handling | ||||
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Ans. BufferedWriter is temporary source for data storage.BufferedWriter is used to write character data to the file.Flush() is method available in B.W which ensures that all data items are written to file including last character.Close() is used to closes the character output stream. | ||||
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Like Discuss Correct / Improve  java   java io   input output   file handling   file io   output stream   bufferedwriter   flush   close | ||||
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Ans. Scanner class introduced in Java 1.5 for reading Data Stream from the imput device. Previously we used to write code to read a input using DataInputStream. After reading the stream , we can convert into respective data type using in.next() as String ,in.nextInt() as integer, in.nextDouble() as Double etc | ||||
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Like Discuss Correct / Improve  java   java5   scanner   file io   file input   data input stream  file handling basic | ||||
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Ans. A Stream is an abstraction that either produces or consumes information. There are two types of Streams : Byte Streams: Provide a convenient means for handling input and output of bytes. Character Streams: Provide a convenient means for handling input & output of characters. Byte Streams classes: Are defined by using two abstract classes, namely InputStream and OutputStream. Character Streams classes: Are defined by using two abstract classes, namely Reader and Writer. | ||||
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Like Discuss Correct / Improve  java   file io   streams   byte stream   character stream  file handling Asked in 3 Companies | ||||
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Ans. The Reader/Writer class hierarchy is character-oriented, and the InputStream/OutputStream class hierarchy is byte-oriented | ||||
Sample Code for InputStream Sample Code for OutputStream | ||||
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Like Discuss Correct / Improve  java   file io   streams   reader class   writer class   inputstream   outputstream   stream  file handling | ||||
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Ans. The purpose of the System class is to provide access to system resources. | ||||
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Like Discuss Correct / Improve  java   system   io   file io | ||||
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Ans. http://www.buggybread.com/2015/01/java-file-io-classes-and-interfaces.html | ||||
Sample Code for File | ||||
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Like Discuss Correct / Improve  java   io   input output   file io  file handling | ||||
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Ans. Scanner is used for parsing tokens from the contents of the stream while BufferedReader just reads the stream. BufferedReader read files efficiently by using a buffer to avoid physical disk operations. Buffer size of Scanner is usually smaller than the Buffered Writer. BufferedReader is faster that Scanner as it just reads the Stream and doesn't Parse the tokens to read the stream into primitive data types. | ||||
Sample Code for Scanner Sample Code for BufferedReader | ||||
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Like Discuss Correct / Improve  java   file io   input output   scanner   bufferedreader  file handling | ||||
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Ans. We can serialize final variables | ||||
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Like Discuss Correct / Improve  serialization   java   file io | ||||
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