【Java学习笔记】<集合框架>对字符串进行长度排序

 1 package 测试;
 2
 3 import java.util.Comparator;
 4
 5 public class ComparatorByLength implements Comparator {   //定义比较器
 6
 7     @Override
 8     public int compare(Object o1, Object o2) {
 9         String s1 = (String)o1;
10         String s2 = (String)o2;
11
12         int temp = s1.length()-s2.length();
13
14         return temp==0? s1.compareTo(s2):temp;
15     }
16
17 }

 1 import java.util.Iterator;
 2 import java.util.TreeSet;
 3
 4 public class TreeSetTest {
 5
 6     public static void main(String[] args) {
 7
 8         TreeSet ts = new TreeSet(new ComparatorByLength());
 9
10         ts.add("aaaaaaaa");
11         ts.add("zz");
12         ts.add("nbaq");
13         ts.add("cba");
14         ts.add("abc");
15
16         Iterator it = ts.iterator();
17
18         while (it.hasNext())
19         {
20             System.out.println(it.next());
21         }
22
23     }
24
25 }