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);
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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