新手才开始学JAVA，不知道GUI的意思，请指点：

[zeroy1978]

老板要我去搞一个项目，其中JAVA要求是：
{
3. Java programming skills.
Specific requirements for 3 programmers:
1. Java GUI development
2. Web development technology, including XML, JSP, HTML, etc.
3. Database: SQL server or Oracle
They don't have to know all three, but at least 2.
Nice-to-have for 3 programmers:
1. Data mining technology
2. Statistics
}
可怜我才学JAVA两天啊，不知道GUI到底是什么意思，恳请各位大虾指点，最好告诉我网上哪里有该类文档看，谢谢！