Java8 新特性
目录
Java 新特性 ....................................................................................................................................................1
1 Lambda 表达式 ....................................................................................................................................2
1.1 Lambda 语法糖 .......................................................................................................................2
1.1.1 语法 ..............................................................................................................................2
1.1.2 Lambda 表达式可使用的变量 ...............................................................................3
1.1.3 lambda 表达式中的 this 概念.................................................................................3
1.2 函数式接口- Consumer/Predicate/Function/Supplier ..................................................4
1.1.4 什么是函数式接口 ....................................................................................................4
1.1.5 Consumer 接口 ..........................................................................................................5
1.1.6 Function 接口 .............................................................................................................6
1.1.7 Supplier 接口 ..............................................................................................................8
1.1.8 Predicate 接口 ............................................................................................................9
1.3 方法引用和构造器 .............................................................................................................. 12
1.2.1 方法引用................................................................................................................... 12
1.2.2 构造器 ....................................................................................................................... 12
1.4 Stream 语法 .......................................................................................................................... 13
1.3.1 入门案例................................................................................................................... 13
1.3.2 怎么得到 Stream .................................................................................................... 15
1.3.3 转换 Stream ............................................................................................................. 16
1.3.4 汇聚 Stream ............................................................................................................. 19
2 Optional 类......................................................................................................................................... 20
2.1 创建 Optional 容器 ............................................................................................................. 21
2.2 容器简单方法 ....................................................................................................................... 22
2.3 容器进阶方法 ....................................................................................................................... 23
1.3.5 ifPresent 方法 .......................................................................................................... 23
1.3.6 orElseGet 和 orElseThrow 方法 ........................................................................... 23
1.3.7 filter 方法 .................................................................................................................. 24
1.3.8 map 方法 .................................................................................................................. 24
1.3.9 flatMap 方法 ............................................................................................................ 25
2.4 总结 ........................................................................................................................................ 25
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