比较Date类
java.utli.Date date1 = new java.util.Date(2013,1,1);
java.utli.Date date2 = new java.util.Date(2011,1,1);
System.out.printn(date1.compareTo(date2));
Arrays类排序数组:
string cities = { "abs","bao","daj","dae"};
java.util.Arrays.sort(cities); //用Arrays类直接排序
原文：https://www.cnblogs.com/jsnazw/p/14760772.html