对于桌面应用程序，嵌入式数据库就足够了。 hsqldb 或 h2 非常适合这一点。您只需要将JAR文件添加到应用程序类路径。 Firebird看起来更复杂。

其实， H2比hsqldb更先进。

i wanna write a small (5-6 table) desktop app in java.I wanna use Firebird 2.1. database.But i googled and see HSQLDB.I wanna make a decision between firebird and hsqldb :)

So which database i have to use ?

For a desktop application an embedded database should be enough. hsqldb or h2 are very well suited for this. You just have to add the JAR file to you applications classpath. Firebird looks more complex.

Actually, H2 is more advanced than hsqldb.