Java nima Java dasturlash tili

Javada construkor yaratish qoydalari

147. 
     Construktr class nomi bilan o’xshash bo’lishi kerak
     
148. 
     Constructor no aniq ma'lumot turini ega bo'lishi kerak
     

Construktorni ikkita turi mavjud

149. 
     Argumentsiz construktrlar
     
150. 
     Parametrlik construktrlar
     

Constructorga oddiy misol

Bu misolda argumentsiz constructr yaratildi Bike1 clasida.Obyekt yaratilishi vaqtida construktrni ishlatadi.

151. 
     class Bike1{
     
152. 
     Bike1(){System.out.println("Bike is created");}
     
153. 
     public static void main(String args[]){
     
154. 
     Bike1 b=new Bike1();
     
155. 
     }
     
156. 
     }
     

Rasimda ko’srsatilganidek java file compiler bo’lgandan keyin aftomatic default construktr yaratadi.

default constructor misol

157. 
     class Student3{
     
158. 
     int id;
     
159. 
     String name;
     
160. 
     
     
161. 
     void display(){System.out.println(id+" "+name);}
     
162. 
     
     
163. 
     public static void main(String args[]){
     
164. 
     Student3 s1=new Student3();
     
165. 
     Student3 s2=new Student3();
     
166. 
     s1.display();
     
167. 
     s2.display();
     
168. 
     }
     
169. 
     } 
     

 ekranda :
0 null
0 null
Parametrga ega bo’lgan constructr

170. 
     class Student4{
     
171. 
     int id;
     
172. 
     String name;
     
173. 
     
     
174. 
     Student4(int i,String n){
     
175. 
     id = i;
     
176. 
     name = n;
     
177. 
     }
     
178. 
     void display(){System.out.println(id+" "+name);}
     
179. 
     
     
180. 
     public static void main(String args[]){
     
181. 
     Student4 s1 = new Student4(111,"Karan");
     
182. 
     Student4 s2 = new Student4(222,"Aryan");
     
183. 
     s1.display();
     
184. 
     s2.display();
     
185. 
     }
     
186. 
     }
     

Ekrada:
111 Karan

222 Aryan

Bu misolda parametrga ega bo’lgan constructr yaratildi.

Constructr va method orasidagi farqlar

Constructor	Method
Constructr dan obyektni dastlabki holatini bilish uchun foydalaniladi	Method obyektni harakterini ifodalashda foydalaniladi
Constructor ma’lumot qaytarmaydi	Method ma’lumot qaytaradi
Constructr bilvosita chaqiriladi	Method oshkora chaqiriladi
Java kompilyator default constructr yaratadi agar constructr bo’lmasa	Kompilyatsiyada method yaratilmaydi
Constructr nomi class nomi bilan bir xil bo’ladi	Method nomi o’xshashi yokiy o;xshamasligi mumkun