How to reference the four 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);

What collection classes are there in Java?

Collections in Java are mainly divided into four categories:

1. List: ordered, repeatable;

2. Queue: ordered and repeatable;

3. Set: non-repeatable;

4. Map: unordered, with unique keys and non-unique values.

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