Java8新特性之lamdba表达式和Optional_java8Optional

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Java8 新特性 
目录 
Java 新特性 ....................................................................................................................................................1 
Lambda 表达式 ....................................................................................................................................2 
1  Lambda 语法糖 .......................................................................................................................2 
1.1  语法 ..............................................................................................................................2 
1.2  Lambda 表达式可使用的变量 ...............................................................................3 
1.3  lambda 表达式中的 this 概念.................................................................................3 
2  函数式接口- Consumer/Predicate/Function/Supplier ..................................................4 
1.4  什么是函数式接口 ....................................................................................................4 
1.5  Consumer 接口 ..........................................................................................................5 
1.6  Function 接口 .............................................................................................................6 
1.7  Supplier 接口 ..............................................................................................................8 
1.8  Predicate 接口 ............................................................................................................9 
3  方法引用和构造器 .............................................................................................................. 12 
2.1  方法引用................................................................................................................... 12 
2.2  构造器 ....................................................................................................................... 12 
4  Stream 语法 .......................................................................................................................... 13 
3.1  入门案例................................................................................................................... 13 
3.2  怎么得到 Stream .................................................................................................... 15 
3.3  转换 Stream ............................................................................................................. 16 
3.4  汇聚 Stream ............................................................................................................. 19 
Optional 类......................................................................................................................................... 20 
1  创建 Optional 容器 ............................................................................................................. 21 
2  容器简单方法 ....................................................................................................................... 22 
3  容器进阶方法 ....................................................................................................................... 23 
3.5  ifPresent 方法 .......................................................................................................... 23 
3.6  orElseGet 和 orElseThrow 方法 ........................................................................... 23 
3.7  filter 方法 .................................................................................................................. 24 
3.8  map 方法 .................................................................................................................. 24 
3.9  flatMap 方法 ............................................................................................................ 25 
4  总结 ........................................................................................................................................ 25 
 
   