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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10.     public static void main(String[] args){
  11.         new Ideone();
  12.     }
  13.  
  14.     public Ideone(){
  15.         Street s = new Street();
  16.         s.name = "Foo";
  17.  
  18.         Building b = new Building();
  19.         b.number = "1";
  20.         b.floors = "1";
  21.  
  22.         s.buildings.add(b);
  23.  
  24.         b = new Building();
  25.         b.number = "2";
  26.         b.floors = "2";
  27.  
  28.         s.buildings.add(b);
  29.  
  30.         b = new Building();
  31.         b.number = "3";
  32.         b.floors = "1";
  33.  
  34.         s.buildings.add(b);
  35.  
  36.         for(Building bu : s.buildings){
  37.             for(int i = 0; i < Integer.parseInt(bu.floors) * 2; ++i){ //2 apartmen per floor
  38.                 bu.apartments.add(new Apartment());
  39.             }
  40.         }
  41.         try {
  42.             System.out.println(s);
  43.             init(s, "buildings.1/floors#3");
  44.             System.out.println(s);
  45.             init(s, "buildings.2/apartments.1/owner#John");
  46.             System.out.println(s);
  47.         } catch (Exception ex) {
  48.             ex.printStackTrace();
  49.         }
  50.     }
  51.  
  52.     public void init(Object o, String pattern) throws Exception{
  53.         String[] array = pattern.split("/");
  54.         for(String s : array){
  55.             if(s.contains("#")){
  56.                 String[] param = s.split("\\#");
  57.                 setValue(o, param[0], param[1]);
  58.             } else {
  59.                 String[] list = s.split("\\.");
  60.                 o = getListItem(o, list[0], Integer.parseInt(list[1]));
  61.             }
  62.         }
  63.     }
  64.  
  65.     public Object getListItem(Object o, String name, int index) throws Exception{
  66.         return ((List)o.getClass().getDeclaredField(name).get(o)).get(index);
  67.     }
  68.  
  69.     public void setValue(Object o, String name, Object value) throws Exception{
  70.         o.getClass().getDeclaredField(name).set(o, value);
  71.     }
  72. }
  73.  
  74. class Street {
  75.     String name;
  76.     List<Building> buildings;
  77.  
  78.     Street(){ buildings = new ArrayList<Building>(); }
  79.  
  80.     @Override
  81.     public String toString() {
  82.         return "[Street] " + name + " " + buildings;
  83.     }
  84. }
  85.  
  86. class Building {
  87.     String number;
  88.     String floors;
  89.     List<Apartment> apartments;
  90.  
  91.     Building(){ apartments = new ArrayList<Apartment>(); }
  92.  
  93.     @Override
  94.     public String toString() {
  95.         return "\n\t[Building] " + number + " " + floors + apartments;
  96.     }
  97. }
  98.  
  99. class Apartment {
  100.     String owner;
  101.  
  102.     @Override
  103.     public String toString() {
  104.         return "[Apartment] " + owner;
  105.     }
  106. }
Success #stdin #stdout 0.04s 711168KB
comments ()
stdin 
Standard input is empty
stdout 
[Street] Foo [
	[Building] 1 1[[Apartment] null, [Apartment] null], 
	[Building] 2 2[[Apartment] null, [Apartment] null, [Apartment] null, [Apartment] null], 
	[Building] 3 1[[Apartment] null, [Apartment] null]]
[Street] Foo [
	[Building] 1 1[[Apartment] null, [Apartment] null], 
	[Building] 2 3[[Apartment] null, [Apartment] null, [Apartment] null, [Apartment] null], 
	[Building] 3 1[[Apartment] null, [Apartment] null]]
[Street] Foo [
	[Building] 1 1[[Apartment] null, [Apartment] null], 
	[Building] 2 3[[Apartment] null, [Apartment] null, [Apartment] null, [Apartment] null], 
	[Building] 3 1[[Apartment] null, [Apartment] John]]
https://ideone.com/WOQsXC
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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