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The similarity of Clonable and Serializable interfaces is that they both are marker interfaces.....
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Arrays in java are static lists that can store a certain kind of variables. Therefore these arrays need to be initialized at the compile time....
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An array can be instantiatd in various ways as follows.
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Java allows us to cast variables of one type to another as long as the casting happens between compatible data types.......
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To send or receive a packet, the sockets send or receive methods can be used: socket.send(packet); socket.receive(packet);....
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Field variables: Variable that are declared as a member of a class. OR Variables declared outside any method/constructor but inside the class block......
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If any bytes that are previously written and have been buffered by the implementation of the output stream...
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Garbage collection in Java identifies and discards the objects that are no longer needed by a program....
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Input from the console is read from the System.in object and is then wrapped by an InputStreamReader which reads one character at a time......
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If a type exceeds a range of a type, it results in an overflow...
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int is one of the primitive datatypes in Java. The Integer class wraps a value of the primitive type int in an object....
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The javap is a command that disassembles a class file. It prints out the package.....
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The Java virtual machine dynamically loads, links, and initializes classes and interfaces...
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StringBuffer class is contained in java.lang package. This class is mutable means the character string in a string buffer gets changed....
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In contrast to the String class which implements immutable character strings, the StringBuffer class implements mutable character strings...
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A Map is an object that maps keys to values. It is not an extension of the collection interface rather it has own interface hierarchy...
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Dynamic class loading: This is done by programmatically invoking the functions of a class loader at run time....
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Class loaders are the part of the Java Runtime Environment that dynamically loads Java classes into the Java virtual machine...
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For using structs framework, directory structure is created in tomcat. Steps for creating directory structure are:...
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Action classes are defined to handle request. Actions exist between Model and view of an application. The struts-config.xml file designates the Action classes that ...
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Java native Interface (JNI) is a programming framework that allows Java code to interact with code written in another language...
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There are two ways to handle an exception in native code: -The native method can choose to return immediately, causing the exception to be thrown in the Java code ....
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Advantages of JNI: 1. JNI enables one to write programs in native language or method when an application cannot be written entirely in the Java programming language...
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ServletConfig: It defines how a servlet is configured. ServletConfig is implemented by the servlet container to initialize a single servlet using init ()....
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HTTP is called a stateless protocol because in this each command is executed independently, without any knowledge of the commands...
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Class and object - A class defines the properties and behavior for the objects represented by the abstraction. Abstraction is a property of object oriented programming...
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Throw and throws clause - A program can throw an exception, using throw statement. When an exception is thrown, normal execution is suspended...
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Tomcat in java and its usage - Tomcat is an open source servlet container. It was developed by Apache Software Foundation. It is commonly known as Apache Tomcat. It is a web server for the processing of JSP and Java Servlets. When a programmer makes web applications by using servlets or JSP then a .war file is made by compressing the application folder...
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Tomcat and Weblogic server - Tomcat is a web server which can run servlets and JSP whereas Weblogic is an application server which can run EJBs also...
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Interface and its implementation - Interface is a set of protocols which are used to define the structure of an application...
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Static and Non-Static fields - Static variables or fields belong to the class, and not to any object of the class...
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What are Class loaders? - Class loaders are the part of the Java Runtime Environment that dynamically loads Java classes....
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Dynamic loading - Classloader and its method LoadClass() is used for dynamic loading of a class...
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Shallow Cloning - Generally cloning means creating a new instance of a same class and copy all the fields to the new instance...
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Deep Cloning - Deep cloning makes a distinct copy of each of object’s field...
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Scheduling and Priority works in threads - Threads are assigned priorities that the thread scheduler can use to determine how the threads will be treated...
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Single threaded model in servlets - A servlet class is instantiated the first time it is invoked. The same instance will be used over several client requests...
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How Java interacts with database? - Java interacts with database with the help of JDBC means Java Database Connectivity...
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Different section of JDBC and their usage. - JDBC Driver Manager, which communicates with vendor-specific drivers that perform the real communication with the database...
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SQLException class - The SQLException Class and its subtypes provide information about errors and warnings that occurs when the data source is accessed...
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CallableStatement interface - It is an interface which is the sub interface of Statement Interface....
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Batch updates using CallableStatement interface - Batch update is the ability to add more than one statement at once...
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Architecture of a Servet package - The javax.servlet package provides interface and classes for writing servlets....
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Different Authentication Options available in Servets - There are four different options for authentication in servlets...
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A realm is a collection of pages, images and applications (collectively known as....
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