Java tutorial
import com.google.gson.Gson; import java.util.HashMap; import java.util.Map; import java.util.List; import java.util.Iterator; import java.util.TreeMap; import java.util.stream.Collectors; /* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ /** * * @author edvinas */ public class CompaniesEditor { public Map<Integer, Company> companies = new HashMap(); Map<Integer, Company> treeMap; public static int total = 5; public CompaniesEditor() { Company temp = new Company(1, "Maxima", "Vilnius", 86511234, 1); companies.put(1, temp); temp = new Company(2, "LemonGym", "Vilnius", 11111111, 2); companies.put(2, temp); temp = new Company(3, "Urmas", "Kaunas", 86515150, 3); companies.put(3, temp); temp = new Company(4, "Lifosa", "Kedainiai", 94646434, 4); companies.put(4, temp); temp = new Company(5, "Maxima", "Kedainiai", 9686868, 5); companies.put(5, temp); } public String toJson(Map<Integer, Company> companies) { Gson gson = new Gson(); String json = gson.toJson(companies); return json; } public Company get(int id) { return this.companies.get(id); } public List<Company> getAll() { return new TreeMap<Integer, Company>(companies).entrySet().stream().map(Map.Entry::getValue) .collect(Collectors.toList()); } public void delete(int id) { this.companies.remove(id); } public void create(Company company) { total++; company.setOwnerId(total); company.setId(total); this.companies.put(total, company); } public void update(int id, Company company) { company.setId(id); this.companies.replace(id, company); } public Map<Integer, Company> getByName(String name) { Map<Integer, Company> returnValue = new HashMap(); int temp; Iterator it = companies.entrySet().iterator(); while (it.hasNext()) { Map.Entry pair = (Map.Entry) it.next(); Company temp1; temp1 = (Company) pair.getValue(); temp = (Integer) pair.getKey(); if (temp1.getName().equals(name)) { System.out.println("PATEKAU"); returnValue.put(temp, temp1); } } return returnValue; } public Map<Integer, Company> getByCity(String city) { Map<Integer, Company> returnValue = new HashMap(); int temp; Iterator it = companies.entrySet().iterator(); while (it.hasNext()) { Map.Entry pair = (Map.Entry) it.next(); Company temp1; temp1 = (Company) pair.getValue(); temp = (Integer) pair.getKey(); if (temp1.getCity().equals(city)) { returnValue.put(temp, temp1); } } return returnValue; } public int cityCount(String city) { int count = 0; Iterator it = companies.entrySet().iterator(); while (it.hasNext()) { Map.Entry pair = (Map.Entry) it.next(); Company temp1; temp1 = (Company) pair.getValue(); if (temp1.getCity().equals(city)) { count++; } } return count; } public int companyCount(String name) { int count = 0; Iterator it = companies.entrySet().iterator(); while (it.hasNext()) { Map.Entry pair = (Map.Entry) it.next(); Company temp1; temp1 = (Company) pair.getValue(); if (temp1.getName().equals(name)) { count++; } } return count; } }