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This article mainly explains "what are the knowledge points about Java8". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "what are the knowledge points about Java8"?

Before we learn about a new technology, we need to understand why we want to learn it and its advantages. Here is my summary:

Java8 (also known as jdk1.8) is a major version of java language development. Java8, released by oracal in March 2014, can be regarded as the most revolutionary version since java5.

Advantages of the new features: faster, less code, easy parallelism, maximum reduction of null pointer exceptions

Functional programming provides a higher level of abstraction

Sort:

List rolesListSort = rolesList.stream () .sorted (Comparator.comparing (RoleEntity::getCreateDate)) .conversation (Collectors.toList ())

Consumer is a functional interface

The parameter is of type Consumer, and the generic type in Consumer indicates that the type of the generic type is either Integer or the parent class of Integer, and super represents it and its upper, that is, the parent class.

The following code is the default method in the Iterable interface, the new method after jdk8, the default method (the default method was introduced largely to ensure backward compatibility)

Default void forEach (Consumer

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