java - Iterate a list of objects and compare properties -

-

i trying iterate list containing helper class objects , compare properties of helper. based on comparison if validation fails,i wanted show error message user. below code snippet.

public static void main(string[] args) {     map<string, string> errormap = new hashmap<string, string>();     simpledateformat format = new simpledateformat("dd/mm/yyyy");     list<helperdto> helpers = new helpertest().gethelpers();      (helperdto helperdto : helpers) {         string helperpkey = helperdto.gethelperpkey();         string employeepkey = helperdto.getemployeepkey();         string helperstart = helperdto.gethelperstart();         string helperend = helperdto.gethelperend();         if (helperstart == null || "".equals(helperstart)) {             errormap.put("helperst_" + helperpkey,                     "helper start required");         }         if (helperend == null || "".equals(helperend)) {             errormap.put("helperend_" + helperpkey,                     "helper end required");         }         if (employeepkey == null || "".equals(employeepkey)) {             errormap.put("employee_" + helperpkey,                     "helper name required");         }          try {             if (helperstart != null && !"".equals(helperstart)                     && helperend != null && !"".equals(helperend)) {                  date helperstartdate = format.parse(helperstart);                 date helperenddate = format.parse(helperend);                  if (!helperenddate.after(helperstartdate)) {                     errormap.put("helperend_" + helperpkey,                             "helper end should after helper start.");                 }             }          } catch (parseexception e) {             e.printstacktrace();         } catch (exception ex) {             ex.printstacktrace();         }     } }  private list<helperdto> gethelpers() {     list<helperdto> hdtolst = new arraylist<helperdto>();     hdtolst.add(new helperdto("100", "manu", "07/06/2013", "08/06/2013"));     hdtolst.add(new helperdto("101", "deepak", "07/06/2013", "08/06/2013"));     hdtolst.add(new helperdto("102", "manu", "07/06/2013", "10/06/2013"));     return hdtolst;         }

how can compare enddate of 1st object startdate of 2nd object , on(if employee name same.in above helper list 1st & 3rd object has same name 'manu'). can me on this. in advance !!

i don't want compare object or remove duplicate object list.

i think need keep hash of last seen enddate each name. e.g. declare before loop:

map<string,date> lastdateforname = new hashmap<string,date>();

then after you've tested else current record, this:

if (lastdateforname.get(employeepkey) != null     && !helperstartdate.after(lastdateforname.get(employeepkey))) {   errormap.put(...); } lastdateforname.put(employeepkey, helperenddate)

Comments

Post a Comment

Popular posts from this blog

Java 3D LWJGL collision -

-
i making 3d java game lwjgl library, , wondering how add collision detection, player not go through models. i using obj models. here objloader class, loads models: package renderengine; import java.io.bufferedreader; import java.io.file; import java.io.filenotfoundexception; import java.io.filereader; import java.util.arraylist; import java.util.list; import models.rawmodel; import org.lwjgl.util.vector.vector2f; import org.lwjgl.util.vector.vector3f; public class objloader { public static rawmodel loadobjmodel(string filename, loader loader){ filereader fr = null; try { fr = new filereader(new file("res/"+filename+".obj")); } catch (filenotfoundexception e) { system.err.println("couldn't load file!"); e.printstacktrace(); } bufferedreader reader = new bufferedreader(fr); string line; list<vector3f> vertices = new arraylist<vector3f...
Read more

methods - python can't use function in submodule -

-
my folder structure this: pythonstuff/ program.py modulea/ __init__.py foo.py bar.py here's code bar.py : def hello(): print("hello, world!") here's code program.py : #!/usr/bin/env python3 modulea import bar bar.hello() i run $ python3 program.py somehow error: file "program.py", line 3, in <module> bar.hello() attributeerror: 'module' object has no attribute 'hello' edit: __init__.py file empty. edit2: after trying realized had bar.py in root directory contained hello() method. bar.py in modulea/ directory empty. add it import os __all__ = [] module in os.listdir(os.path.dirname(__file__)): if module != '__init__.py' , module[-3:] == '.py': __all__.append(module[:-3]) the init .py files required make python treat directories containing packages; done prevent directories common name, such string, unintentionally hiding v...
Read more

c# - ErrorThe type or namespace name 'AxWMPLib' could not be found (are you missing a using directive or an assembly reference?) -

-
what possible reference handler axwmplib._wmpocxevents_playstatechangeeventhandler ? when pass event in method, private void axwindowsmediaplayer1_playstatechange(object sender,axwmplib._wmpocxevents_playstatechangeevent e) compiling throws following error: the type or namespace name 'axwmplib' not found (are missing using directive or assembly reference?) if using visual studio make sure have axwmplib listed under references in solution explorer. if have embedded windows media player control in form, should have been added automatically along wmplib . an easy way add these libraries if missing add windows media player control form (an existing 1 do). right-click on toolbox , pick "choose items..." context menu, tick "windows media player" control on "com components" tab , click ok. should have little windows media player icon attached cursor; click on form add it. add axwmplib , wmplib references solution. can delete w...
Read more