按长度排序字符串数组

 1 import java.util.Comparator;
 2 import java.util.Set;
 3 import java.util.TreeSet;
 4 
 5 public class SortString {
 6 
 7     public static void main(String[] args) {
 8         String[] strs = new String[] { "abcdef", "abcde", "abcdefg", "abc",
 9                 "abccd" };
10 
11         Set<String> set = sort(strs);
12         for (String s : set)
13             System.out.println(s);
14     }
15 
16     private static Set<String> sort(String[] strs) {
17         // TODO Auto-generated method stub
18         Set<String> set = new TreeSet<>(new Comparator<String>() {
19 
20             @Override
21             public int compare(String o1, String o2) {
22                 // TODO Auto-generated method stub
23                 if (o1.length() < o2.length())
24                     return -1;
25                 else if (o1.length() > o2.length())
26                     return 1;
27                 return o1.compareTo(o2);
28             }
29         });
30 
31         for (String s : strs)
32             set.add(s);
33 
34         return set;
35     }
36 
37 }