Java8 stream用法

 

 

 

        // 测试stream
        List<Person> personList = new ArrayList<>();
        Person p = null;
        for (int i = 0; i < 10; i++) {
            p = new Person();
            p.setCode(String.valueOf(i));
            p.setNameZh("路人：" + i);
            personList.add(p);
        }
        List<Person> personListFiltered = personList.stream().filter(person -> Integer.parseInt(person.getCode()) > 3).collect(Collectors.toList());

        List<String> codeList = personList.stream().filter(person -> Integer.parseInt(person.getCode()) < 6).map(Person::getCode).collect(Collectors.toList());

        Map<String,String> codeMap = personList.stream().filter(person -> Integer.parseInt(person.getCode()) < 6).collect(Collectors.toMap(Person::getCode,Person::getNameZh));