How to remove unused code in IntelliJ IDEA?
In IntelliJ, in a .java file, some unused code is greyed out indicating that the declared variable or function is never used. Unused imports are removed using Ctrl+Alt+O. Is there any shortcut to remove those unused declarations?
As @Magnilex pointed out, hover over the unused variable / method and hit alt + enter to open the intentions menu (if that's how its called).
But in addition to this, don't just remove / safe delete this on variable, but choose "Fix all 'Unused declaration' problems in this file" which will not only get rid of this one, but of all.
See here: 
An alternative approach might be to us the "Run inspections by name" and run the "Unused declaration" inspection for your whole project / module / Package, whatever.
This can be achieved by either right clicking on the editor, and chosing >Analyze >Run Inspection by Name from the context menu (or the keyboard short cut, which is ctrl+alt+shift+i by default). Then type "Unused declaration":
This will inspect your code for unused declarations and display them in an overview:
- NoClassDefFoundError org/apache/poi/ss/usermodel/Workbook
- Tinkerpop vertex property single cardinality is not working
- What's the difference between ZonedDateTime and OffsetDateTime?
- Error: The method add(Shape) in the type ArrayList<Shape> is not applicable for the arguments (Shape.Rectangle)
- How do I save ArrayLists with different names in a while loop?
- How to parse a BPMN file with Java?
- IntelliJ - test configuration. How to configure once run for everyone?
- Jasper Reports: JRBeanCollectionDataSource cannot be resolved to a type
- What is a "static class" in Java?
- Spring's @RequestParam with Enum
- Do Java arrays have a maximum size?
- How to automatically convert if-else if statement to switch
- net.sf.jsqlparser.parser.ParseException: Encountered unexpected token: "@" "@"
- Java: Making System.out.println() argument span multiple lines?
- Identifier versus keyword
- How can I multiply all the digits in an integer (between 000 & 1000 exclusive) without using control statements or loops?
- Jackson deserialize generic class with field T as POJO or String array
- Role-based authentication not working with Keycloak and Java Spring
- Installing two apk using one apk
- @KafkaHandler in the consumer doesn't consume the topic message as an object class, only as a string
- map vs flatMap in reactor
- Request Matcher not working to permit allowed path
- Java - Sending an object that points to a BufferedImage through a Socket
- does NewDirectByteBuffer create a copy in native code
- Excel-like JTable Cell Editor, with an empty cell at edition start
- Adding binary numbers
- Java Spring API NoClassDefFoundError: javax/persistence/EntityManagerFactory
- Leetcode - Find the student that will replace the chalk
- UnsatisfiedDependencyException: Error creating bean with name
- Is there a way to save multiple config files in a sub-folder of the plugin-folder (Spigot & Maven)