如何封装一个自己的组件

一步一步教你学会如何用Java程序如何封装一个底层的属于自己的组件的一个例子，隶属RCP插件开发，swt/jface这块

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2007-11-13 20:01  developerworks.ve.example.textitem_1.0.0\
     目录           0  2007-11-13 17:57  developerworks.ve.example.textitem_1.0.0\icons\
     文件         983  2007-11-13 17:57  developerworks.ve.example.textitem_1.0.0\icons\sample.gif
     目录           0  2007-11-13 17:57  developerworks.ve.example.textitem_1.0.0\meta-INF\
     文件         518  2007-11-13 17:57  developerworks.ve.example.textitem_1.0.0\meta-INF\MANIFEST.MF
     目录           0  2007-11-13 17:57  developerworks.ve.example.textitem_1.0.0\overrides\
     目录           0  2007-11-13 17:57  developerworks.ve.example.textitem_1.0.0\overrides\developerworks\
     目录           0  2007-11-13 17:57  developerworks.ve.example.textitem_1.0.0\overrides\developerworks\ve\
     目录           0  2007-11-13 17:57  developerworks.ve.example.textitem_1.0.0\overrides\developerworks\ve\example\
     目录           0  2007-11-13 17:57  developerworks.ve.example.textitem_1.0.0\overrides\developerworks\ve\example\textitem\
     文件         731  2007-11-13 17:57  developerworks.ve.example.textitem_1.0.0\overrides\developerworks\ve\example\textitem\TextItem.override
     目录           0  2007-11-13 17:57  developerworks.ve.example.textitem_1.0.0\palette\
     文件        1481  2007-11-13 17:57  developerworks.ve.example.textitem_1.0.0\palette.xmi
     文件        1450  2007-11-13 17:57  developerworks.ve.example.textitem_1.0.0\palette\BorderTextItem.xmi
     文件       11284  2007-11-13 17:57  developerworks.ve.example.textitem_1.0.0\plugin.jar
     文件        1791  2007-11-13 20:01  developerworks.ve.example.textitem_1.0.0\plugin.xml
     文件        4371  2007-11-13 17:57  developerworks.ve.example.textitem_1.0.0\pluginsrc.zip
     文件       11128  2007-11-13 17:57  developerworks.ve.example.textitem_1.0.0\textitem.jar
     文件        7756  2007-11-13 17:57  developerworks.ve.example.textitem_1.0.0\textitembeaninfo.jar