The Extract Constant refactoring makes your source code easier to read and maintain. It also helps you avoid using hardcoded constants without any explanations about their values or purpose.
Extract a constant
In the editor, select an expression or declaration of a variable you want to replace with a constant.
Press Control+Alt+C to introduce a constant or select.
Select an expression you want to extract as constant and press Enter. Select the number of occurrences you want to replace and a name you want to use.