How to access variables using java's Lambda

1. Lambda expressions can access external local final variables

final int num = 1; Converter stringConverter = (from) -> String.valueOf(from + num); stringConverter.convert(2); // 3

2. Contrary to accessing local variables, member variables and static variables can be read and written through lambda expressions . This way of accessing variables is also implemented in anonymous variables:

class Lambda4 { static int outerStaticNum; int outerNum; void testScopes() { Converter stringConverter1 = (from) -> { outerNum = 23; return String.valueOf(from); }; Converter stringConverter2 = (from) -> { outerStaticNum = 72; return String.valueOf(from); }; } }

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