[开发工具]java范型集合转换通用方法 List＜E＞ 转 List＜T＞

方法一：

// 方法一 
public static <T,K> List<K> convertList1(List<T> sourceList, Class<K> clazz){

    List<K> results = new ArrayList<>();
    
    for (T t : sourceList){
        K k = JSON.parseObject(JSON.toJSONString(t), clazz);
        results.add(k);
    }


    return results;
}

方法二：

// 方法二
public static <T,K> List<K> convertList2(List<T> sourceList, Class<K> clazz) throws IllegalAccessException, InstantiationException {

    List<K> results = new ArrayList<>();
    
    for (T t : sourceList){
        K k = clazz.newInstance();
        BeanUtils.copyProperties(t, k);
        results.add(k);
    }

    return results;
}

测试方法

    public static void main(String[] args) throws InstantiationException, IllegalAccessException {

        Person person1 = new Person();
        person1.setName("foo");

        Person person2 = new Person();
        person2.setName("bar");

        List<Person> personList = new ArrayList<>();
        personList.add(person1);
        personList.add(person2);

        // List<PersonDTO> personDTOList = convertList2(personList, PersonDTO.class);
        List<PersonDTO> personDTOList = convertList2(personList, PersonDTO.class);
        System.out.println(JSON.toJSONString(personDTOList));

    }

测试输出

[{"name":"foo"},{"name":"bar"}]

Process finished with exit code 0

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