164_集合_SortedSet_集合详解_01

package settest;import java.util.*;import java.text.*;public class Test02 {/* * SortedSet * 特点：无序，不可重复，但是会按照大小排列 * **/public static void main(String[] args) throws Exception {String  str1 = "2008-10-01";String  str2 = "2007-10-01";String  str3 = "2009-02-01";String  str4 = "2030-08-01";String  str5 = "2006-10-01";SimpleDateFormat  sdf = new SimpleDateFormat("yyyy-MM-dd");Date d1 = sdf.parse(str1);Date d2 = sdf.parse(str2);Date d3 = sdf.parse(str3);Date d4 = sdf.parse(str4);Date d5 = sdf.parse(str5);SortedSet s1  = new TreeSet();s1.add(d1);s1.add(d2);s1.add(d3);s1.add(d4);s1.add(d5);    Iterator m = s1.iterator();while(m.hasNext()){Object o = m.next();if(o instanceof Date){Date d =(Date)o;System.out.println(sdf.format(d));}}}}