Topic: 转向 J2EE 菜鸟 求帮忙!!! |
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1.转向 J2EE 菜鸟 求帮忙!!! | Copy to clipboard |
Posted by: nicholastse0303 Posted on: 2005-11-20 22:14 现在想转向j2ee,请大家帮忙,以前一直研究j2se.现在想学习j2ee .请大家给些入门的帮助,要安装什么,以前的jdk要不要卸载等.开发工具的.以前用eclipse. 谢谢各位拉先. |
2.Re:转向 J2EE 菜鸟 求帮忙!!! [Re: nicholastse0303] | Copy to clipboard |
Posted by: andony756 Posted on: 2005-11-27 14:32 大家好! 我想请问一下 我的程序和数据库都没问题的情况下 编译时总出现java.lang.NullPointerException 是怎么回事 我电脑的操作系统home版的xp sp2的 数据库是SQL SERVER 2000的 是不是不能和数据库连接 也许是xp自带防火墙的问题 请问如何解决 |
3.Re:转向 J2EE 菜鸟 求帮忙!!! [Re: andony756] | Copy to clipboard |
Posted by: why Posted on: 2005-11-27 18:46 andony756 wrote: Do a search on our Database board or Google. 编译时总出现java.lang.NullPointerException? What did you mean? Maybe you could show us how you "compiled" the code and all the messages. |
4.Re:转向 J2EE 菜鸟 求帮忙!!! [Re: nicholastse0303] | Copy to clipboard |
Posted by: 22750124 Posted on: 2005-11-27 20:44 java.lang.NullPointerException? 中文意思是“空指针错误” |
5.Re:转向 J2EE 菜鸟 求帮忙!!! [Re: nicholastse0303] | Copy to clipboard |
Posted by: andony756 Posted on: 2005-11-28 21:32 post's removed. use http://www.cjsdn.net/post/view?bid=10&id=164214 |
6.Re:转向 J2EE 菜鸟 求帮忙!!! [Re: nicholastse0303] | Copy to clipboard |
Posted by: chinamicrofox Posted on: 2006-01-05 03:05 当你的代码中应用了一个不存在的对象时,在运行时会抛出空指针异常。你的代码肯定有问题 |
7.Re:转向 J2EE 菜鸟 求帮忙!!! [Re: nicholastse0303] | Copy to clipboard |
Posted by: chinamicrofox Posted on: 2006-01-05 03:07 搞清对象object和引用reference之间的关系很重要,我们写代码时要随时想想栈内存和堆内存的概念 |
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