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[Java教程]【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 }