java逻辑分页

public List<Student>  intPage(int pageNum,int pageSize,List<Student> list){

Page page = new Page();

page.setPageSize(pageSize);

page.setCurrentPage(pageNum);

page.setFirstResult(pageSize*pageNum);

PageUtils.setCurrentPage(page);

int index = 0;

List<Student>  list2 = new ArrayList<>();

for(Student student : list){

if(pageNum == 0){

if(index > pageSize){

break;

}

if(index <= pageSize){

list2.add(student);

}

}

if(pageNum  > 0){

if(index > (pageSize*(pageNum + 1))){

break;

}

if(index > (pageSize*pageNum-1) && index <= (pageSize*(pageNum+1))){

list2.add(student);

}

}

index++;

}

return list2;

}