Why don't instance fields need to be final or effectively final to be used in lambda expressions?
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I'm practicing lambda expressions in Java. I know local variables need to be final or effectively final according to the Oracle documentation for Java SE 16 Lambda Body : Any local variable, formal parameter, or exception parameter used but not declared in a lambda expression must either be final or effectively final (§4.12.4), as specified in §6.5.6.1. It doesn't say why though. Searching I found this similar question Why do variables in lambdas have to be final or effectively final?, where StackOverflow user "snr" responded with the next quote: Local variables in Java have until now been immune to race conditions and visibility problems because they are accessible only to the thread executing the method in which they are declared. But a la...