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。
Platforms
Java is platform independent and it can run on Windows, Linux and Mac OS.
.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.
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