stream+新日期+lombda表达式--应用总结

r囧r小猫 2023-06-29 02:25 0阅读 0赞

### stream问题清单 ###

*  获取集合中对象某个属性的最大值的那条记录
 *  根据对象的某些属性去重
 *  将对象列表List< Object >转Map
 *  视频学习
 *  函数式编程（lambda表达式）
 *   *  函数编程的写法
 *  stream api
 *  番外篇
 *  其他特性
 *  日期操作

# 获取集合中对象某个属性的最大值的那条记录 #

CallLogInfo callLogInfo = infos.stream().max((obj1, obj2) -> obj1.duration > obj2.duration ? 1 : -1).get();

# 根据对象的某些属性去重 #

*  对象是pojo（可采取treeset去重)
 *  对象是map

//PageData是自定义的map的子类
    public List<PageData> getAllGoods() { 
            List<PageData> pageDataList = goodsDao.selectAllGoods();
            //使用map去重
            List<PageData> unique2 = pageDataList.stream()
                    .filter(distinctByKey(o -> o.get("id")))
                    .collect(Collectors.toList());
           // System.out.println(unique2);
            return unique2;
        }
    
        public static <T> Predicate<T> distinctByKey(Function<? super T, Object> keyExtractor) { 
            Map<Object, Boolean> seen = new ConcurrentHashMap<>();
            //System.out.println("这个函数将应用到每一个item");
            return t -> seen.putIfAbsent(keyExtractor.apply(t), Boolean.TRUE) == null;
        }

# 将对象列表List< Object >转Map #

[List转Map的三种方法][List_Map]

# 视频学习 #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70]

# 函数式编程（lambda表达式） #

[函数式编程讲解—写的非常好][Link 1]

*  不使用lambda表达式的代码：

Comparator<Integer>com=new Comparator<Integer>() { 
                @Override
                public int compare(Integer o1, Integer o2) { 
                    /** * 相等返回0，o1大返回1，o1小返回-1，默认是降序排列 * 也可写成 Integer.compare(o1,o2); */
                    return o1-o2;
                }
            };
            TreeSet<Integer> treeSet=new TreeSet<>(com); //treeset是一个有序集合（com是定义排序的规则）

使用之后

TreeSet<Integer> ltreeSet=new TreeSet<>((x,y)->y-x);

## 函数编程的写法 ##

无参的

@FunctionalInterface
    public interface FunInteface { 
    /** Consumer<T>: 消费型接口，接收数据并处理【无返回值】 */
    void test();			//使用时：
    
    /** Predicate<T>: 断言型接口，检测入参是否符合条件（符合则返回true）【返回类型为boolean】 */
    boolean test(int a,T t);  //(x,y)-> x>y;
    }
    /** Function<T, R>: 函数型接口，接收参数，返回结果【有返回类型】 */
    int test(int a,T t);   //FunInteface<Integer> ft=(x,y)-> x-y; int res= ft.test(1,5);
    
    /** Supplier<T>: 供给型接口，对外提供数据【给什么就返回什么】 */
     T test(int a,T t); // FunInteface<Integer> ft=(x,y)-> x-y; int res= ft.test(1,5);
    
    
    //------------------------------------
    @Test
        public void test5Fun(){ 
           FunInteface ft=()-> System.out.println("无参");
           ft.test();
        }

多参的，多语句的

@FunctionalInterface
    public interface FunInteface<T> { 
        void test(int a,T t);
    }
    @Test
        public void test5Fun(){ 
           FunInteface<Integer> ft=(x,y)-> { Integer b=x-y;System.out.println(b);};
           ft.test(1,5);
        }

四大核心函数接口的用法如下：

/** * @author gc * 方法引用：若lambda体中的内容有方法已经实现了，我们可以使用“方法引用” * （可以理解为方法引用是lambda表达式的另外一种表达形式） * 主要有三种语法格式： * 对象::实例方法名 * 类::静态方法名 * 类::实例方法名 * 注意： * 1.lambda体中调用方法的参数列表与返回值类型，要与函数式接口中抽象方法的参数列表和返回值类型一致 * 2.若lambda参数列表 中的第一个参数是实例方法的调用者，而第二个参数是实例方法的参数时，可以使用className::method * * 二、构造器引用 * 格式： * ClassName::new Function<String,Employee> fun=Employee::new; //构造方法的参数最多1个 BiFunction<String,Integer,Employee> funm=Employee::new; //构造方法的参数最多2个 */
    public class TestMethodRef { 
    
     //--------消费类型的 
        //对象::实例方法名
        @Test
        public void test() { 
            Consumer<String> consuemr = (x) -> System.out.println(x);
            consuemr.accept("aaaa");
            
            PrintStream ps = System.out;
            Consumer<String> consumer2 = ps::println;
            consumer2.accept("asdf");
        }
        //-----供应者类型
        @Test
        public void test2() { 
            User user= new User("gc",20,200000);
            //这里是无参，所以左边使用了()
            Supplier<String> sup = () -> user.getName();
            System.out.println(sup.get());
            
            //这里对lambda表达式进行了省略。() -> user.getAge() == user::getAge
            Supplier<Integer> sup2 = user::getAge;
            System.out.println(sup2.get());
        }
        //-----函数类型
        //类::静态方法名
        public void test3() { 
            Comparator<Integer> com = (x,y) -> Integer.compare(x, y);
            
            //这里因为入参和lambda实现方法要调用的入参一样。所以两边都省略了
            Comparator<Integer> com1 = Integer::compare;
        }
        //------断言类型
        //类::实例方法名
        public void test4() { 
            BiPredicate<String, String> bp = (x,y) -> x.equals(y);
            
            //这里是两个入参，而且满足第一个参数是新方法调用者，第二个参数是入参的情况
            //理论而言都用上面的表达式即可，看起来比较简单，但是不能避免别人不会使用简写方式，看不懂岂不是很尴尬
            BiPredicate<String, String> bp2 = String::equals;
        }
        
        @Test
        public void test5() { 
            //函数式接口生产数据的方式是new User();
            Supplier<User> sup = () -> new User();
            //这里功能同上，简写方式
            Supplier<User> sup2 = User::new;      //----方法引用：注意由于是Supplier所以参数类型和返回类型要一致
            System.out.println(sup2.get());
        }
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 1]

# stream api #

List<Employee> list = Arrays.asList(new Employee("张三", 18, 1200), new Employee("李四", 20, 1300), new Employee("王五", 16, 800));
    
    //获取工资大于500的前两名员工的姓名
            list.stream().filter(x -> x.getSalary() > 500).limit(2).map(Employee::getName).forEach(System.out::println);
            //map(里面是一个函数式接口：遍历List<Employee> list---new arraylist<String>().add(调用Employee.getName方法拿到名字))---------》将集合中对象的方法应用到每个元素上

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 2]

中间操作  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 3]  
归约最后得到的是一个计算结果，而非集合/hash，收集返回的才是一个集合/hash

String sentence="to be or not to be,that is a question";
            String[] wordList = sentence.split("[\\s|,]");
            String reduce = Arrays.stream(wordList).reduce("", (x, y) -> x +" "+y);
            System.out.println(reduce);  //打印结果： to be or not to be that is a question

map+reduce模式【映射+归约】----大数据和云计算的实现----实现累加  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 4]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 5]  
【假如add和addAll都传入一个List】add(Object obj)整个集合添加到当前集合（即map（）整个集合放入流中），addAll(Collection coll)集合中的每个元素添加到当前集合（即（flatMap（）集合里面的每个元素放入流中））

map映射的用法  
![在这里插入图片描述][20200429151437896.png]  
![在这里插入图片描述][20200429151523769.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 6]  
排序  
![在这里插入图片描述][20200429151749314.png]

查找和匹配  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 7]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 8]  
最大值最小值和统计  
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Optional<Employee>op=employeeList.stream().filter().findFirst()  里面有op.orElse(other);机制，类似if(obj==null){ } else{ obj.getName;}来防止为空

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 10]  
收集流式运算的结果  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 11]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 12]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 13]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 14]  
![在这里插入图片描述][20200429154535356.png]  
使用练习  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 15]  
![在这里插入图片描述][20200429154826472.png]

![在这里插入图片描述][20200429155139692.png]  
![在这里插入图片描述][2020042915522784.png]

# 番外篇 #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 16]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 17]

fork/join框架使用案例

class ForkJoinCalulate extends RecursiveTask<Long>{ 
        @Override
        protected Long compute() { 
            return null;
        }
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 18]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 19]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 20]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 21]

# 其他特性 #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 22]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 23]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 24]  
接口中的默认实现方法和静态方法  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 25]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 26]

# 日期操作 #

给人读的  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 27]  
给计算机读的  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 28]

计算时间的间隔  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 29]  
时间校正器【获得下周的时间，每年的第一天】  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 30]  
时间格式化

@Test
        void time(){ 
            //DateTimeFormatter isoDateTime = DateTimeFormatter.ISO_DATE_TIME;//默认的----2020-04-30T11:33:32.607
            DateTimeFormatter isoDateTime = DateTimeFormatter.ISO_DATE;//默认的----2020-04-30
            /** * 2020年04月30日: 11:37:34 * ldt.parse(fm2,df2) -- 2020-04-30T11:39:27 * Set<String> availableZoneIds = ZoneId.getAvailableZoneIds(); //获得所有支持的时区 */
            DateTimeFormatter df2 = DateTimeFormatter.ofPattern("yyyy年MM月dd日: HH:mm:ss");
    
            LocalDateTime ldt = LocalDateTime.now();
            String fm2 = ldt.format(df2);
        }

带时区的操作  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70 31]

[List_Map]: https://blog.csdn.net/linsongbin1/article/details/79801952
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200429083043786.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMDYzMTQx,size_16,color_FFFFFF,t_70
[Link 1]: https://www.cnblogs.com/gc65/p/10604616.html
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[20200429151437896.png]: https://img-blog.csdnimg.cn/20200429151437896.png
[20200429151523769.png]: https://img-blog.csdnimg.cn/20200429151523769.png
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