Why are only final variables accessible in anonymous class?

Why are only final variables accessible in anonymous class?

java event-handling anonymous-class

java

How to pass parameters to anonymous class?

java anonymous-class

java

Access "this" from Java anonymous class

java this anonymous-class

java

Java8 Lambdas vs Anonymous classes

java lambda java-8 anonymous-class

java

Multiple inheritance for an anonymous class

java multiple-inheritance anonymous-class

java

Java 8 Lambda Expressions - what about multiple methods in nested class

java lambda java-8 anonymous-class

java

Can we create an instance of an interface in Java? [duplicate]

java interface instance inner-classes anonymous-class

java

Is usage of anonymous classes in Java considered bad style or good? [closed]

java coding-style anonymous-class

java