Before getting started developing an application the developer must ensure that he/she is going to develop an application by using the best tools. The combination of two features Platform Independent and Object Oriented makes the java powerful to build the flexible application. In old days it was difficult to develop the flexible applications by using the conventional toolsets, java made it easy.
Due to the global utilization of java language, new tools are being developed daily and are providing the user friendly tools to develop the flexible and powerful application that are easy to use. Daily development of new tools are making the application easy but on the other hand they are creating much confusion to the java developers. Some of them are illustrated below:
Here we are trying to answer of all these questions as well as provide the tools to develop the java application.
Let's start with the Java Development Kit: Sun Microsystems made some standards as open to gain comments and suggestions at public level for the improvement and advancement of the java language. To support Sun Solaris operating systems and 32-bit Windows (Windows 95 and Windows NT) Sun provided the implementation of the Java Virtual Machine. Sun also provided the basic tools needed for java programming. JDK contains all the to tools to develop a java application or an applet. JDK contains the sample application, a compiler, an interpreter, a debugger and an appletviewer to test your code. As a beginner, we consider that neither you don't have the java development kit nor the knowledge about the installation of JDK on your machine. So let's start from the ground level,
This link provides you the information about the latest version of the JDK. Just by clicking the link ensure that your computer have the latest version of the JDK otherwise download the latest version of the JDK from JavaSoft website. you have three choice to download the jdk for the following operating systems:
The order may be different of the above three options on the site.
We can get the JDK by FTP from ftp.javasoft.com. Choices of all of the operating system are available, and the JDK can be found in the \pub directory. Availability of JDK for all these operating systems means that the Sun made some enhancement in JVM and deployment tools to support all these operating systems. It is nothing for the browsers vendors this means that they must provides some hooks to display the java applet within their windows. Now the time is about to come when java will running on everything from cellular phone to mainframe.
JDK Installation: JDK installation instruction varies from platform to platform. So on the basis of the instruction we divided the JDK installation into three parts depending on the platform such as Windows, Solaris and Macintosh.
A good question arises here "If java is cross platform then for each platform why we need to download the separate files". So the answer is that the source file once compiled can run on any platform provided the JVM should be installed. But the key point is that the Java Developer Kit contains a no of executive files (such as Compiler, Interpreter, Debugger and so on) that are compiled specific to a platform. While the source code (.java files) are similar to Windows as well as Solaris.
JDK Installation on Sun Solaris:
JDK Installation on Windows 95 and Windows NT:
JDK installation on Apple Macintosh system 7.5:
Testing the installation: Run the sample application included with the JDK by using the appletviewer application. This application is located in the \bin directory of the installation. JDK and the tools included with it are command line. To run the applet viewer in Windows 95 and Windows NT just go to the DOS prompt and go through the following steps.
Exploring the java Developer's kit: The tools included in the JDK are contained in various directories. Some directories are illustrated below that contains the most widely tools used to develop the java application.
bin\ directory : The bin\ directory contains the following tools.
demo\ directory : This directory contains a large number of applets that are useful to understand "what exactly the applets are and how they are developed?"
include\ directory : This directory contains the a set of C and C++ header files. Java classes use these files just to make the interface to C and C++ language.
lib\ directory : This directory contains the classes.zip as the primary file. This is the combination of all the classes that together make up the JDK. Primary packages in this directory are:
rc\ directory : This directory contains all the source files used by JDK. It will not be visible for the Windows 95/NT users. But they can restore it by unzipping the src.zip file from the root directory of JDK.
Distributing the Java Virtual Machine: When the most user think about java, they think about the Java applet but java is not limited to only applet. stand alone applications can be made in java by using JDK. Windows 95/NT setup requires the following files:
Other Development Environment: Now Software developers have become habitual to work with the fully graphical environments. The tools such as Microsoft Visual Basic, Borland Delphi, Powerbuilder, and Powersoft, known as Rapid application development made easy to use and increased the programmer productivity. Then Java came in the market. In the beginning JDK was designed to run virtually on any platform which have the Java Virtual Machine and to work as a basic development toolkit. Whole of the industry getting benefits with the more powerful java tools.Microsoft, Sun, Symantec, and Borland are the manufacturers of the most anticipated tools. Java development can be done on every operating system that are available today.
Summary: The necessary tools required to development a java application, are available in the Java Developer's kit (JDK). Nowadays a wide range of platforms support the Java Development tools.