JAVA8 Supplier接口

系统管理员 2021-09-26 21:00 310阅读 0赞

下看下接口定义

@FunctionalInterface
    public interface Supplier<T> {
    
        /**
         * Gets a result.
         *
         * @return a result
         */
        T get();
    }

supplier  
英 \[səˈplaɪə(r)\]   美 \[səˈplaɪər\]    
n.  
供应商;供应国;供应者，供给者;补充者  
  
看语义，可以看到，这个接口是一个提供者的意思，只有一个get的抽象类，没有默认的方法以及静态的方法，传入一个泛型T的，get方法，返回一个泛型T

下面，我们用一个小案例，来看看这个接口，是干什么用的

Supplier<String> supplier = String::new;
            System.out.println(supplier.get());//""
            Supplier<Emp> supplierEmp = Emp::new;
            Emp emp = supplierEmp.get();
            emp.setName("dd");
            System.out.println(emp.getName());//dd

可以看到，这个接口，只是为我们提供了一个创建好的对象，这也符号接口的语义的定义，提供者，提供一个对象，

直接理解成一个创建对象的工厂，就可以了；

Emp对象定义如下

public static class Emp {
            private String name;
    
            public Emp() {
    
            }
    
            public Emp(String name) {
                super();
                this.name = name;
            }
    
            public String getName() {
                return name;
            }
    
            public void setName(String name) {
                this.name = name;
            }
    
        }

## 1.lambda表达式 ##

[《java8 Lambda表达式简介》][java8 Lambda]

[《java8 lambda表达式，方法的引用以及构造器的引用》][java8 lambda]

### 2.函数式接口 ###

[《java8 函数式接口简介》][java8]

[《JAVA8 Function接口以及同类型的特化的接口》][JAVA8 Function]

[《JAVA8 Consumer接口》][JAVA8 Consumer]

[《JAVA8 Supplier接口》][JAVA8 Supplier]

[《JAVA8 UnaryOperator接口》][JAVA8 UnaryOperator]

[《JAVA8 BiConsumer 接口》][JAVA8 BiConsumer]

3.stream接口操作

[《java8 Stream接口简介》][java8 Stream]

[《 java8 Stream-创建流的几种方式》][java8 Stream-]

[《JAVA8 stream接口 中间操作和终端操作》][JAVA8 stream_]

[《JAVA8 Stream接口，map操作，filter操作，flatMap操作》][JAVA8 Stream_map_filter_flatMap]

[《JAVA8 stream接口 distinct，sorted，peek，limit，skip》][JAVA8 stream_ distinct_sorted_peek_limit_skip]

[《java8 stream接口 终端操作 forEachOrdered和forEach》][java8 stream_ _ forEachOrdered_forEach]

[《java8 stream接口 终端操作 toArray操作》][java8 stream_ _ toArray]

[《java8 stream接口 终端操作 min，max，findFirst，findAny操作》][java8 stream_ _ min_max_findFirst_findAny]

[《java8 stream接口终端操作 count，anyMatch，allMatch，noneMatch》][java8 stream_ _ min_max_findFirst_findAny]

[《java8 srteam接口终端操作reduce操作》][java8 srteam_reduce]

[《java8 stream接口 终端操作 collect操作》][java8 stream_ _ collect]

4.其他部分

[《java8 Optional静态类简介，以及用法》][java8 Optional]

[java8 Lambda]: https://blog.csdn.net/qq_28410283/article/details/80961022
[java8 lambda]: https://blog.csdn.net/qq_28410283/article/details/80963351
[java8]: https://blog.csdn.net/qq_28410283/article/details/80962325
[JAVA8 Function]: https://blog.csdn.net/qq_28410283/article/details/80615629
[JAVA8 Consumer]: https://blog.csdn.net/qq_28410283/article/details/80618456
[JAVA8 Supplier]: https://blog.csdn.net/qq_28410283/article/details/80625482
[JAVA8 UnaryOperator]: https://blog.csdn.net/qq_28410283/article/details/80634319
[JAVA8 BiConsumer]: https://blog.csdn.net/qq_28410283/article/details/80704487
[java8 Stream]: https://blog.csdn.net/qq_28410283/article/details/80633292
[java8 Stream-]: https://blog.csdn.net/qq_28410283/article/details/80633710
[JAVA8 stream_]: https://blog.csdn.net/qq_28410283/article/details/80634725
[JAVA8 Stream_map_filter_flatMap]: https://blog.csdn.net/qq_28410283/article/details/80642786
[JAVA8 stream_ distinct_sorted_peek_limit_skip]: https://blog.csdn.net/qq_28410283/article/details/80643711
[java8 stream_ _ forEachOrdered_forEach]: https://blog.csdn.net/qq_28410283/article/details/80782808
[java8 stream_ _ toArray]: https://blog.csdn.net/qq_28410283/article/details/80783286
[java8 stream_ _ min_max_findFirst_findAny]: https://blog.csdn.net/qq_28410283/article/details/80783946
[java8 srteam_reduce]: https://blog.csdn.net/qq_28410283/article/details/80873910
[java8 stream_ _ collect]: https://blog.csdn.net/qq_28410283/article/details/81052881
[java8 Optional]: https://blog.csdn.net/qq_28410283/article/details/80952768