Use Java programs to sort and stitch strings

1. The code program that initially generates the string:

Package Com.map.test;import Java.util.arraylist;import Java.util.collections;import java.util.hashmap;import Java.util.list;import Java.util.map;public class Test {/** * @param args */public static list<map<string, String&gt ;> maps = new arraylist<map<string,string>> (); Static{map m1 = new hashmap<string, string> (); m1.put ("Total", "ten"), M1.put ("Createtime", "2014-10-18"); Maps.add (M1); Map m2 = new hashmap<string, string> (), M2.put ("Total", "a"), M2.put ("Createtime", "2014-10-15"), Maps.add (m2); Map m3 = new hashmap<string, string> (), M3.put ("Total", "a"), M3.put ("Createtime", "2014-10-19"); Maps.add (m3); MAP M4 = new hashmap<string, string> (), M4.put ("Total", "Max"), M4.put ("Createtime", "2014-10-17"); Maps.add (M4); Map M5 = new hashmap<string, string> (), M5.put ("Total", "n"), M5.put ("Createtime", "2014-10-16"), Maps.add (M5); Map M6 = new hashmap<string, string> () m6.put ("Total", "Max"), M6.put ("Createtime", "2014-10-20"); Maps.add (M6); Map M7 = new Hashmap<string, String> (), M7.put ("Total", "Createtime"), M7.put ("The", "the", "2014-10-21"); Maps.add (M7);} 

2, Main method call stitching method

public static void Main (string[] args) {//TODO auto-generated method Stubsortlist (maps); gettimestring (); gettotalstring ();}

3. Sort the program

Package Com.map.test;import Java.text.parseexception;import Java.text.simpledateformat;import java.util.Comparator ; Import Java.util.date;import Java.util.map;public class Reportcompare implements Comparator<map<string, String >> {@Overridepublic int compare (map<string, string> O1, map<string, string> O2) {String o1time = O1.get ( "Createtime"); String o2time = O2.get ("Createtime"); SimpleDateFormat SDF = new SimpleDateFormat ("Yyyy-mm-dd"); try {Date o1d = Sdf.parse (o1time);D ate o2d = Sdf.parse (o2time); if (O1d.before (o2d)) {return-1;} else if (o1d.equals (o2d)) {return 0;} else if (O1d.after (o2d)) {return 1;}} catch (ParseException e) {//TODO auto-generated catch Blocke.printstacktrace ();} return 2;}}

4. Stitching strings

public static void Gettimestring () {stringbuffer sb = new StringBuffer ("["); for (map<string, string> map:maps) {SB . Append ("'" +map.get ("createtime") + "',");} Sb.deletecharat (Sb.length ()-1); Sb.append ("]"); System.out.println (Sb.tostring ());} public static void Gettotalstring () {stringbuffer sb = new StringBuffer ("["); for (map<string, string> map:maps) {s B.append (Map.get ("total") + ",");} Sb.deletecharat (Sb.length ()-1); Sb.append ("]"); System.out.println (Sb.tostring ());} public static list<map<string, string>> sortlist (list<map<string, string>> maps) { Collections.sort (Maps, new Reportcompare ()); return maps;}}

Use Java programs to sort and stitch strings