java - 如何使用 arraylist 根据用户定义的排序对类对象进行排序？

Question

我正在使用arreyList中的比较器对类对象进行排序，我是根据名称的字母顺序排序对象
比较器的来源(如果低于)

public static Comparator<SortingObjects StuNameComparator = new Comparator<SortingObjects() {

    public int compare(SortingObjects s1, SortingObjects s2) {                 
       String StudentName1 = s1.getName().toUpperCase();                       
       String StudentName2 = s2.getName().toUpperCase();                       
       int c;                                                                  

       c = StudentName1.compareTo(StudentName2);                               



       if(c==0){                                                               
           int rollno1 = s1.getPrice();                                    
           int rollno2 = s2.getPrice();                                    
            c = rollno1-rollno2;                                           
       }                                                                       


       return c;                                                               

    }};  

其给出的结果如下:

 Student Name Sorting:   


     [ name=AP, price =0]
     [ name=AP, price =0]
     [ name=AP, price =0]
     [ name=AP, price =0]
     [ name=CH, price =0]
     [ name=CH, price =0]
     [ name=CH, price =0]
     [ name=CH, price =0]
     [ name=KE, price =0]
     [ name=KE, price =0]
     [ name=TN, price =0]

但我想要像这样的输出:

[ name=CH, price =3]    
   [ name=CH, price =10]
   [ name=AP, price =2] 
   [ name=AP, price =2] 
   [ name=AP, price =7] 
   [ name=AP, price =10]
   [ name=TN, price =15]
   [ name=KE, price =2] 
   [ name=KE, price =5] 

这意味着:“CH”首先出现，然后是“AP”，然后是“TN”，最后
“KE”有什么方法可以实现比较方法，以便我可以得到结果由自己定义的排序

Answer 1

您可以将排序存储到数组中并将其用作比较器:

public static Comparator<SortingObjects StuNameComparator = new Comparator<SortingObjects() {
    List ordering = Arrays.asList("CH","AP","TN","KE");
    public int compare(SortingObjects s1, SortingObjects s2) {                 

       return ordering.indexOf(s1.name) - ordering.indexOf(s2.name);                                                               

    }};  

这只是一个片段，它应该是这样的。