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java8study's Introduction

Java8 新特性学习

lambda1

  • 观察Java8新特性的特点和方便性，初始Java8 函数式编程、stream api等

lambda2

  • Java8 的基础语法，箭头，左右两部分的含义
  • 什么是函数式接口？
  • 一些示例

lambda3

  • lambda表达式使用练习

lambda4

  • Java8 四大核心函数式接口，防止每次用lambda表达式都要自己定义接口的麻烦

method1

  • 方法引用与构造器引用

Stream

  • 数据源转化成流，中间可以有一系列处理，产生新的流（而不是数据源）
    • Stream 不会存储数据
    • 不会改变源对象，而是返回一个持有结果的新Stream
    • 延迟执行，需要结果时才执行

stream1

  • 创建stream
  • 中间操作
  • 终止操作

stream2

  • 终止操作
    • 归约 map -> reduce
    • 收集 collect，然后可以求和，求最大最小，分组等操作

stream3

stream API小练习

parallel

并行化处理

optional类

  • 常用方法
  • 主要是为了防止空指针异常

interfacefunction

  • 类优先原则
  • 多实现时，要指定实现的是哪个接口的方法

date1

  • Java8 新事件格式
    • 主要注意，时间对象每次都是新的，有效防止多线程冲突

Annotation

  • 重复注解
  • 类型注解

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