Java Serialization Vs De-Serialization The capability of an object to exist beyond the execution of the program that created it is known as persistence To make the file object persistent, the file object has...
Java Call By Value and Call By Reference Pass by value in java means passing a copy of the value to be passed. Pass by reference in java means the passing the address itself....
The exception denotes an abnormal event or unexpected situations. Exception-handling is needed to handle unexpected situations like: inability to find files problems in network connectivity running out of memory resource allocation errors To handle...
NullPointerException is a RuntimeException . In Java, a special null value can be assigned to an object reference. NullPointerException is thrown when an application attempts to use an object reference that has the null...
Java has only two types of memory when it comes to JVM. Heap memory and Non-heap memory. All the other memory jargons you hear are logical part of either of these two. Heap Memory...
difference between Abstract Class and Interface? 1. Main difference is methods of a Java interface are implicitly abstract and cannot have implementations. A Java abstract class can have instance methods that implements a default...
Transient variable can’t be serialize. For example if a variable is declared as transient in a Serializable class and the class is written to an ObjectStream, the value of the variable can’t be written...
Apache parser Simple API for XML (SAX) The Apache parser version 1.2.3 (commonly known as Xerces) is an open-source effort based on IBM’s XML4J parser. Xerces has full support for the W3C Document Object...
What is Session? What is Session Management? Why Use Session Management? Different ways to maintain Session. Hidden form field URL rewriting Cookies Servlet session API [ HttpSession ] Session Management Examples What is Session?...
forward Control can be forward to resources available within the server from where the call is made. This transfer of control is done by the container internally and browser / client is not involved....
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