错误：
Unable to parse template “Class”
Error message: Selected class file name ‘User.java’ mapped to not java file type ‘Text files’
原因：
Step 1: Click “File”==> “Settings”
Step 2: Expand “Editor” & Click “File Types”
Step 3: You will see all file types on Right. Navigate to the “Text Files” and Click it
Step 4: You should able to see your file name on the bottom of Registered Patterns (lower box)
Step 5: Remove your file from the Registered Patterns. The problem should solved and let you to rename with fileName.java
Step 6: If not, delete the file from the project and create it again with name fileName
删掉就好了，这是之前不小心注册上去的
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