How to use java Function

Explanation

1.Function is a new feature of JDK1.8, which represents a function that receives parameters and generates results.

2. The function of the Function interface is that we can provide it with raw materials and it can produce the final product. Processed through the default methods, combinations, and links it provides.

Examples

Function<String, Integer> toInteger = Integer::valueOf;
Function<String, String> backToString = toInteger.andThen(String::valueOf);
 
backToString.apply("123");     // "123"

What collection classes are there in Java

Collections in Java are mainly divided into four categories:

1, List List: ordered, repeatable;

2, Queue queue: ordered, repeatable;

3, Set collection: non-repeatable;

4, Map mapping: unordered, unique keys, non-unique values.

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