How to access variables using java Lambda

1. Lambda expressions can access external local final variables

final int num = 1;
Converter<Integer, String> 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<Integer, String> stringConverter1 = (from) -> {
            outerNum = 23;
            return String.valueOf(from);
        };
 
        Converter<Integer, String> stringConverter2 = (from) -> {
            outerStaticNum = 72;
            return String.valueOf(from);
        };
    }
}

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