why lambda expression doesn't write `.class` but inner class do

Question

public static void main(String[] args) {

    Comparator<String> comparator = new Comparator<String>() {
        @Override
        public int compare(String o1, String o2) {
            return Integer.compare(o1.length(), o2.length());
        }
    };

    Comparator<String> comparator1 = (String a, String b) -> {
        return Integer.compare(a.length(), b.length());
    };


    Comparator<String> comparator2 = Comparator.comparing(String::length);

}

class file: LambdaAndAnonymousInner$1.class and LambdaAndAnonymousInner.class

the LambdaAndAnonymousInner$1.class is comparator

comparator1 and comparator2 doesn't write .class file

I wonder why it happened

score 6 · Accepted Answer · answered May 23 '17 at 02:35

6

This is because lambdas are invoked dynamically.

Refer to this: http://wiki.jvmlangsummit.com/images/1/1e/2011_Goetz_Lambda.pdf

answered May 23 '17 at 02:35

Sourav Gulati

1,359
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why lambda expression doesn't write `.class` but inner class do

1 Answers1