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Core Java - Interview Questions and Answers for 'File' - 52 question(s) found - Order By Newest | ||||
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Ans. NullPointerException at line: "File file = new File("/folder", name);" | ||||
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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. It will create the file myfile.txt in the current directory. | ||||
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Ans. web.xml | ||||
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Ans. Yes. | ||||
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Ans. hibernate.cfg.xml ( Main Configuration File ) and *.hbm.xml files ( Mapping Files ) | ||||
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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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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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Ans. 1. Property files 2. config xml 3. Database | ||||
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Ans. File folder = new File(path); if(!folder.exists()){ try { folder.mkdir(); } catch (Exception e) {} } | ||||
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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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Ans. Spring configuration file is an XML file. This file contains the classes information and describes how these classes are configured and introduced to each other. | ||||
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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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Ans. The purpose of the System class is to provide access to system resources. | ||||
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Ans. 2nd | ||||
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Ans. file.txtC:file.txtC:file.txt | ||||
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Ans. NullPointerException at line:File file = new File("/folder", child); | ||||
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Ans. ..file.txt C:WorkspaceProject..file.txt C:Workspacefile.txt | ||||
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Ans. OutputStreamWriter | ||||
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Ans. FileReader | ||||
Sample Code for FileReader | ||||
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Ans. FileInputStream | ||||
Sample Code for FileInputStream | ||||
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Ans. InputStream | ||||
Sample Code for InputStream | ||||
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Ans. c. File file = new File("../file.txt"); FileWriter fileWriter = new FileWriter(file); BufferedWriter bufferedOutputWriter = new BufferedWriter(fileWriter); | ||||
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Ans. IOException | ||||
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Ans. FileNotFoundException | ||||
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Ans. Though we are trying to serialize BuggyBread1 object but we haven't declared the class to implement Serializable. This will throw java.io.NotSerializableException upon execution. | ||||
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Ans. No, It will throw java.io.NotSerializableException. | ||||
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Ans. Yes. | ||||
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Ans. It is a form of Input Output processing that permits other processing to continue before the I/O transmission has finished. | ||||
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