1、Some projects cannot be imported because they already exist in the workspace
2、Some projects were hidden because they exist in the workspace directory
有时候eclipse或者myeclipse导入项目的时候会发生上面两个错误，IDE不允许我们导入。具体原因是在IDE的workspace中已经存在了相同名字的项目，所以不能导入。
解决办法则是修改项目名：
1、right click --- refactor --- rename
2、workspace中要修改名字的项目 --- 打开.project文件 --- 修改<name>projectName</name>
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参考资料：velocityreviews.com
ps:诚然修改项目名可以解决，但是给人的感觉好像是以前的找不到了（工程目录下面明明没有）导致无法删除，只好改名，实乃无奈之举!!
思考--加入不进去，一定是以前的有一个标记记录了你的工程信息，也就是说找到那个标记删除它，我们就不用改名字了。经过我的摸索
E:\workspace\eclipseworkspace\.metadata\.plugins\org.eclipse.core.resources\.projects 在我的这个版本的eclipse上是这个目录里面
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