Java is the general name of Java programming language and Java platform launched by Sun Microsystems in May 1995. HotJava browser (supporting Java applets) implemented in Java shows the charm of Java: cross-platform, dynamic Web and Internet computing. Since then, Java has been widely accepted and promoted the rapid development of the Web, and now commonly used browsers support Java applet.
Writing java software requires java platform, that is, JDK, and also needs to install development tools, such as eclipse or myeclipse, that is, development tools for writing java code.
Java platform consists of Java virtual machine and Java application programming interface (API). Java application programming interface provides a standard interface independent of operating system for Java applications, which can be divided into basic part and extended part. After installing the Java platform on the hardware or operating system platform, Java applications can be run. Now the Java platform has embedded almost all operating systems. In this way, Java programs can be compiled at one time and run in various systems.
You can write some small programs by installing these development software. If you need to write large-scale programs that use databases, you must install configuration database software, such as mysql, sqlserver, oracle, etc. Of course, you also need to install configuration servers, such as tomcat, webservice and so on.