Java8 Stream
Fork/Join框架
延时操作特性
在终结阶段,才会中间操作会进行操作。
public class TestStream{ static class Student{ private String name; public String getName(){ System.out.println(this.name); return this.name; } public void setName(String name){ this.name = name; } pubic Student(String name){ this.name = name; } } public static void main(String[] args) { List list = Arrays.asList(new Student("12"),new Student("22"),new Student("13"),new Student("123")); list.stream().filter(b->b.getName().startWith("1")).foreach(b->{ System.out.println(b.getName()); }) } }
常用的中间操作(Intermediate)
- map(mapToInt,flagMap等)
- filter
- distinct
- sorted
- peed
- limit
- skip
- parallel
- sequential
- unordered
- concat
常见的终结操作(Terminal)
- forEach
- forEachOrdered
- toArray
- reduce
- collect
- min
- max
- count
- iterator
短路操作(Short-circuiting)
任务执行到中间,就终止stream的操作,也是终结操作。
- anyMatch
- allMatch
- noneMatch
- findFirst
- findAny
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