java - Keep the order of the map as in the arrayList before -
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i trying merge line toghether create data programm. curently merging part of strings in arraylist's buffer works when output content of map getting of string in arraylist's buffer.
is there way keep order of strings in arraylist buffer?
output:
nathan marcus adler [04:43, 05:43, 12:11, 12:41, 19:11, 19:41] dukes of bedford [04:56, 05:56, 12:24, 12:54, 19:24, 19:54] prince albert [04:48, 05:48, 12:16, 12:46, 19:16, 19:46] joseph addison [04:41, 05:41, 12:08, 12:38, 19:08, 19:38] william baker [04:52, 05:52, 12:20, 12:50, 19:20, 19:50] the ouput should looks this:
joseph addison [04:41, 05:41, 12:08, 12:38, 19:08, 19:38] nathan marcus adler [04:43, 05:43, 12:11, 12:41, 19:11, 19:41] prince albert [04:48, 05:48, 12:16, 12:46, 19:16, 19:46] william baker [04:52, 05:52, 12:20, 12:50, 19:20, 19:50] dukes of bedford [04:56, 05:56, 12:24, 12:54, 19:24, 19:54] code:
public static void main(string[] args) { arraylist<string> buffer = new arraylist<string>(); buffer.add("joseph addison 04:41 05:41"); buffer.add("nathan marcus adler 04:43 05:43"); buffer.add("prince albert 04:48 05:48"); buffer.add("william baker 04:52 05:52"); buffer.add("dukes of bedford 04:56 05:56"); buffer.add("joseph addison 12:08 12:38 "); buffer.add("nathan marcus adler 12:11 12:41"); buffer.add("prince albert 12:16 12:46"); buffer.add("william baker 12:20 12:50"); buffer.add("dukes of bedford 12:24 12:54"); buffer.add("joseph addison 19:08 19:38"); buffer.add("nathan marcus adler 19:11 19:41"); buffer.add("prince albert 19:16 19:46"); buffer.add("william baker 19:20 19:50"); buffer.add("dukes of bedford 19:24 19:54"); map<string, list<string>> map = new hashmap<>(); arraylist<placetime> list = new arraylist<placetime>(); (string element : buffer) { placetime part = new placetime(element); list.add(part); } (placetime t : list) { if (map.containskey(t.getplace())) { // if map contains entry place, add // times array map.get(t.getplace()).addall(t.gettimes()); } else { // map not contain entry place, create new entry map.put(t.getplace(), t.gettimes()); } } // print out contents of map (entry<string, list<string>> entry : map.entryset()) { system.out.println(entry.getkey()); system.out.println(entry.getvalue()); } system.out.println("test"); } placetime class:
public class placetime { stringbuilder place = new stringbuilder(); list<string> times = new arraylist<>();; public placetime(string placetime) { dateformat dateformat = new simpledateformat("hh:mm"); (string i:placetime.split(" ")) { try { dateformat.parse(i); //no exception, add time times.add(i); } catch (exception e) { //exception, add place name place.append(i).append(" "); } } } public string getplace() { return place.tostring(); } public list<string> gettimes() { return this.times; } }
use treemap sort natural or customized or linkedhashmap mantain insertion order:
linkedhashmap insertion order
hash table , linked list implementation of map interface, predictable iteration order. linked list defines iteration ordering, order in keys inserted map (insertion-order).
treemap natural or custom sorting
a red-black tree based navigablemap implementation. map sorted according natural ordering of keys, or comparator provided @ map creation time, depending on constructor used.
instead of hashmap
this class makes no guarantees order of map; in particular, not guarantee order remain constant on time.
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