This will find all references of a particular class, method, field, or attribute and search for its usage in your various project's files. Do this with Assistant > Find Usages . A new panel will open and list all references for String into your project. If you select one of the occurrence and double click on it, the editor will open the file to the position of the found reference.
Che provides the ability to refactor your source code.
Put your cursor on the method, variable, or field that you want to rename and hit Shift + F6. If this hotkey is pressed once, the selected keyword will be highlighted which means it's ready for refactoring. You can type a new name and press Enter.
If you press Shift + F6 twice, an advanced Rename mode is called out: