Java Tutorial Pdf In Hindi
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Our core Java programming tutorial is designed for students and working professionals. Java is an object-oriented, class-based, concurrent, secured and general-purpose computer-programming language. It is a widely used robust technology.
It is a Java programming platform. It includes Java programming APIs such as java.lang, java.io, java.net, java.util, java.sql, java.math etc. It includes core topics like OOPs, String, Regex, Exception, Inner classes, Multithreading, I/O Stream, Networking, AWT, Swing, Reflection, Collection, etc.
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A good naming convention is to use the same name for the top level package and the project.For example, if you name your project com.example.javaproject you should also use com.example.javaproject as the top-level package name.
The Package Explorer view allows you to display the associated file from the currently selected editor.For example, if you are working on the Foo.java file in the Java editor and switch to the Java editor of the Var.java file, then the corresponding file will be selected in the Package Explorer view.
There are a lot of shortcuts available for navigation.Please check the appendix of this tutorial for these shortcuts or open Window+Preferences General Keys to find and redefine shortcuts at runtime.
Servlets are Java programs that runs inside a Java-capable HTTP server. A user can invoke a servlet by issuing a specific URL from the browser (HTTP client). In this example, we shall write a servlet called \"HelloServlet.java\" and compiled into \"HelloServlet.class\". A client can invoke \"HelloServlet.class\" by issuing URL :port/helloServlet/sayhello (i.e., \"sayhello\" relative to the webapp).
A servlet shall be kept inside a Java package (instead of the default no-name package) for proper deployment. Let's call our package \"mypkg\". Create a sub-directory called \"mypkg\" under \"WEB-INF\\src\". Use a programming text editor to enter the following source codes, and save as \"HelloServlet.java\" in \"\\webapps\\helloservlet\\WEB-INF\\src\\mypkg\".
Two request methods, GET and POST, are available for submitting form data, to be specified in the 's attribute \"method=GETPOST\". GET and POST performs the same basic function. That is, gather the name-value pairs of the selected input elements, URL-encode, and pack them into a query string. However, in a GET request, the query string is appended behind the URL, separated by a ''. Whereas in a POST request, the query string is kept in the request body (and not shown in the URL). The length of query string in a GET request is limited by the maximum length of URL permitted, whereas it is unlimited in a POST request. I recommend POST request for production, as it does not show the strange looking query string in the URL, even if the amount of data is limited. In this tutorial, I use GET method, so that you can inspect the query string on the URL.
Programming your own session tracking (using the above approaches) is tedious and cumbersome. Fortunately, Java Servlet API provides a session tracking facility, via an interface called javax.servlet.http.HttpSession. It allows servlets to:
Each webapp is represented in a single context within the servlet container (such as Tomcat, Glassfish). In Servlet API, this context is defined in javax.servlet.ServletContext interface (a better name is probably WebappContext). A webapp may use many servlets. Servlets deployed in the same webapp can share information between them using the shared ServletContext object.
Java Programming: History of Java, comments, Data types, Variables, Constants, Scope and Lifetime of variables, Operators, Operator Hierarchy, Expressions, Type conversion and casting, Enumerated types, Control flow- block scope, conditional statements, loops, break and continue statements, simple java stand-alone programs, arrays, console input and output, formatting output constructors, methods, parameter passing, static fields and methods, access control, this reference, overloading methods and constructors, recursion, garbage collection, building strings, exploring string class.
Multithreading: Differences between multiple processes and multiple threads, thread states, creating threads, interrupting threads, thread priorities, synchronizing threads, inter-thread communication, producer-consumer pattern, Exploring java.net, and java.text
Collection Framework in Java: Introduction to java collections, Overview of java collection framework, Generics, Commonly used collection classes- Array List, Vector, Hash table, Stack, Enumeration, Iterator, String Tokenizer, Random, Scanner, Calendar, and Properties
This part of the Selenium tutorial includes the Selenium Cheat Sheet. In this part, you will learn various aspects of Selenium that are possibly asked in interviews. Also, you will have a chance to understand the most important Selenium terminologies.
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