java - 如何按特定数据段对数组进行排序？

Question

我有一个像这样的字符串数组:

String[] array = { "CC/2", "DDD/3", "AAAA/4", "B/1" };
Arrays.sort(array);
System.out.println(Arrays.toString(array));

当我执行这段代码时，我得到以下信息:

[AAAA/4, B/1, CC/2, DDD/3]

这是正确的，但是我想改为按编号值对其进行排序，以便得到以下结果:

[B/1, CC/2, DDD/3, AAAA/4]

我该怎么做？

Answer 1

你可以通过使用 Comparator<String> 来做到这一点

    /* You may found some shortcuts for this
       but following code is easy to understand 
    */
    String[] array = { "CC/2", "DDD/3", "AAAA/4", "B/1"};
    Arrays.sort(array, new Comparator<String>() {

        public int compare(String o1, String o2) {
            int i1,i2;
            /* 
               You should add some checks like 
               1] null check
               or 
               2] whether String contains / or not etc before going for further 
               code.
            */
            /* Get Numbers from String To compare */
            i1=Integer.valueOf(o1.split("/")[1]);
            i2=Integer.valueOf(o2.split("/")[1]);
            //May throw NumberFormatException so be careful with this

            if(i1>i2)
                return 1;
            else if(i1<i2)
                return -1;
            else
                return 0;
        }
    });
    System.out.println(Arrays.toString(array));//Print array