jdk 8 操作list

• 集合从一种类型转换成另一种类型

• 常规for循环

public List change() {
    List list = new ArrayList(){{
            add(new Student());
            add(new Student());
            add(new Student());
        }};
        List studentDTOList = new ArraryList();
        for(Student st : list){
			studentDTOList.add(new StudentDTO(st));
		}

    return studentDTOList;
}

• jdk8新特性

public List change() {
    List list = new ArrayList(){{
            add(new Student());
            add(new Student());
            add(new Student());
        }};
    List operateLogDTOList =list.stream().map( data -> new SystemOperateLogDTO(data)).collect(Collectors.toList());

    return list1;
}