Java is a high-level programming language originally developed by Sun Microsystems and released in 1995. Java runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX.
.NET framework is a computer software framework invented by Microsoft. It runs on Microsoft Windows OS (Operating Systems). It provides user interface, data access, database connectivity, cryptography, web application development, etc.
Languages
Java supports only Java patterns.
.NET支持多种语言，如VB.NET，C＃，F＃等。
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Platforms
Java is platform independent and it can run on Windows, Linux and Mac OS.
Ajax是目前比较流行的网站建设技术，尤其作为网站建设者来说，掌握它十分有必要，如果用原生Javascript开发则比较困难，还好有强大的Jquery加持，开发则变的十分简单和容易。
.NET works on Windows.
Runtime
Java拥有Java虚拟机、字节码、JDK、JRE等等。
.NET has Common Language Runtime
GUI组件
Java有Java Beans，而.NET有它的类。
数据库
JDBC is used for connecting Java with database, whereas for database in .NET, use ADO.NET.
