You can also declare the variable you are extracting as final. IntelliJ IDEA also displays that you can use to configure more options. If IntelliJ IDEA finds more than one occurrence, it lets you specify a scope and extract just a part of the found occurrences and not just all of them. Select a name suggested in the popup or type your own and press Enter. Press Ctrl+Alt+V or from the main menu, select Refactor | Extract/Introduce | Variable.
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You can also position the caret within the expression, in this case IntelliJ IDEA offers you a list of potential code selections.
In the editor, select an expression or its part that you want to extract. You can use the Introduce Variable refactoring to extract variadic arguments into a new slice variable. In this case, all the occurrences will be replaced with old-style cast expression. Also, you can inline pattern variable since the Java 14 version. If your Java version supports the pattern matching (Java 14 preview or higher) and you are extracting a cast expression under the instanceof check, IntelliJ IDEA may introduce a pattern variable at that instanceof check instead of a normal local variable. Starting with Java 1.8 and later versions, IntelliJ IDEA also lets you extract a functional type variable. If you come across an expression that is hard to understand or it is duplicated in several places throughout your code, the Extract Variable refactoring Ctrl+Alt+V can help you deal with those problems placing the result of such expression or its part into a separate variable that is less complex and easier to understand.
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