java根据字段拆分list

可以使用Java 8中的stream和map方法来实现。具体的实现代码如下：

public static List<String> splitListByField(List<?> list, String fieldName) {
    return list.stream()
            .map(obj -> {
                try {
                    Field field = obj.getClass().getDeclaredField(fieldName);
                    field.setAccessible(true);
                    return field.get(obj).toString();
                } catch (NoSuchFieldException | IllegalAccessException e) {
                    e.printStackTrace();
                }
                return null;
            })
            .filter(Objects::nonNull)
            .collect(Collectors.toList());
}

示例用法：

class Person {
    private String name;
    private int age;
    
    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public int getAge() {
        return age;
    }
}

List<Person> personList = Arrays.asList(
        new Person("张三", 20),
        new Person("李四", 22),
        new Person("王五", 25)
);

List<String> nameList = splitListByField(personList, "name");
List<String> ageList = splitListByField(personList, "age");

调用splitListByField方法，并传入需要拆分的list和字段名称即可得到拆分后的结果，在本例中，得到的nameList和ageList分别为：

["张三", "李四", "王五"]
[20, 22, 25]