How to reference methods in java8

1. Constructor method reference

Test test = Test.create(Test::new);

2. Static method reference

test.operate(1, 2, Test::add);

3. Object instance Method reference

test.operate(1, 2, test::sub);

4. Instance method reference of the class,satisfies the instance method first, not the static method.

The first parameter of the Lambda expression will become the object of the calling instance.

test.test(Test::testM);

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