JAVA Interview Questions
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In this presentation you will learn about latest frequentlyCSS asked Interview relatedOOPS to JavaAjax and HTML PHPquestions SQL C C++ Advance Java. Python etc... More info related to TOP Java Interview questions and Answers
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What are the features in Java? Java Programming Language is a lot more than just a usual programming language It is also a multi-platform,which is with inbuilt security to prevent hacking Here are some features that make java different from other languages: ● ● ● ●
Robustness nature Platform Independency Global operative No Explicit memory management
Name some of the Java IDE’s. IDE stands for Integrated Development Environment It is an environment that have a lot of classes functions in a single package i.e code editor, compiler, debugger etc… Some IDE’s are: ● ● ● ●
NetBeans Eclipse Intellij IDEA DrJava
What is the difference between Hashmap and Hashtable. HashMap ● No synchronization of methods ● Iterator is used to iterate the values ● There is no thread safety ● HashMap extends an abstract class Abstract Map ● Allows null key only once and multiple null values
HashTable ● Key methods are synchronization ● Nothing with null attribute is allowed ● Thread safety ● The Enumerator is used to iterate the values ● Slower performances
How to read text from Inputstream in Java? Java provides several mechanisms in order to read from a file. One important class that helps in performing this operation is the BufferedReader. BufferedReader is a Java class that reads text from the input stream. It buffers the characters so that it can get the efficient reading of characters, arrays, etc. It inherits the reader class and makes the code efficient since we can read the data line-by-line with the readline() method public static void main(String args[] throws Exception) { FileReader f = new FileReader("file location"); BufferedReader b = new BufferedReader(f); while((int i = b.read()) != -1){ System.out.println((char) i); } b.close(); f.close();
Difference between Scanner and BufferedReader. BufferedReader
● Synchronous and should be used with multiple threads ● Buffer Memory is large ● Faster than scanner ● Uses buffering to read characters from the character input stream
Scanner
● Not synchronous and not used with multiple threads ● Buffer Memory is smaller ● Does parsing of the input data ● It is a simple text scanner ,parses strings and primitive types
What is Linked list in Java? In java Linked list class is a doubly linked list implementation of list and Deque interfaces. Linked list Class Declaration, Linked list is a generic class that has this declaration: Public class LinkedList<E> Extends AbstractSequentialList<E> Implements List<E>, Deque<E> ,Cloneable<E>
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