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  • Difference between ArrayList and LinkedList in Java

    ArrayList and LinkedList are two popular collection classes in Java and Major difference between ArrayList and LinkedList is on there implementation w
  • How to encode byte array into Base64 encoding in JAva

    Quick tutorial on how to include byte array or String into base 64 encoding in Java. We often need to encode content before sending it to server in or
  • Difference between Fail Safe and FailFast Iterator

    fail-safe iterators are relatively new concept in Java. as compared to fail-fast iterator which fail as soon as they detect any structural change in c
  • Solution of java.lang.NoClassDefFoundError: orgapache

    Exception in thread main java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory error or java.lang.ClassNotFoundException: org.apache.
  • How to call blocking methods in Java

    Blocking methods put Current thread on blocking position until method returns like ServerSocket accept() method which blocks until a client Socket con
  • Why Wait and Notify is in Object Class in Java

    Wait and notify method are used to put thread on wait but they are not in Thread class alongwith Sleep() or Join() method instead they are declared in
  • How to find which date is greater in Java

    Java provides multiple ways to compare two Dates in Java. here we will see 3 simple example to convert two dates in Java and find out whether one date
  • Difference between Class and Instance variable in Java

    Java provides different kinds of variable e.g. Class variable or Static variable, Instance variable or non static variable, Local variable. In this a
  • How to reverse order of String in Java using recursion

    This is also a very popular java interview questions mostly asked as how to reverse string in Java without using Stringbuffer reverse but There are ma
  • Character Encoding in Java beginners guide

    character encoding is very important when you are in business of converting bytes of String and if you have not specified default character encoding f
  • Page specific and global Error page in JSP and Servlet

    There are two ways you can set error page in any Java application or JSP Servlet application first by specifying a page specific error page on each of
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  • How to deal java.sql.SQLException: Invalid column index

    Main reason of SQLException:Invalid Column Index is either you are trying to read an invalid column index from result set returned by Query or you are
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  • How to check if JVM is 32 bit or 64 bit in Java

    Quick tip to find out if JVM you are running is 64 bit or not. There are two ways to check if JVM you are running is 64 bit or not. either by using co
  • How to Overloaded Constructor in java

    Good tutorial on What is Constructor overloading, Benefit of Constructor overloading in Java and how to do Constructor overloading in Java.
  • Difference between Serializable and Externalizable Java

    There are many differences between Serialization and Externalization the way they do serialization in java. if used correctly Externalizable interface
  • Difference between URL Encoding and URL Rewriting

    URL Rewriting and UrL Encoding are two similar but yet different terms and concept. URL Encoding is used to encode special character while URL Rewriti
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  • How to find free memory in Java with Example

    Simple examples how freeMemory(), totalMemory() and maxMemory() function of Java runtime can be used to find memory usage in Java.
  • Where to use Assertion in Java Program

    Assertion in java is fairly underused feature but if used carefully can complement both Unit Testing and Exception handling. Since Assertion sits on c
  • Simple tips to improve performance of Java application

    Some simple tips to improve performance of Java application which uses database as back-end. These are very simple in order to follow but you can also
  • How to Sort Array in java in ascending order Example

    quick tutorial on how to sort array in java in both ascending and descending order of elements. This is like sorting Arraylist in java after convertin