Algoritmlash asoslari

public class TestCollection3{

 

public static void main(String args[]){

 

 

Student s1=new Student(101,"Zafar",23);

 

Student s2=new Student(102,"Aziz",21);

 

Student s2=new Student(103,"Jalol",25);

 

 

ArrayList<Student> al=new ArrayList<Student>();

 

al.add(s1);// Student klass ob’yekti qo’shilyapti

 

al.add(s2);

 

al.add(s3);

 

 

Iterator itr=al.iterator();

 

while(itr.hasNext()){

 

Student st=(Student)itr.next();

 

System.out.println(st.rollno+" "+st.name+" "+st.age);

 

}

 

}

 

}


Ekranda:

101 Zafar 23

102 Aziz 21

103 Jalol 25
addAll() funksiyasi ya'ni ikkita listni bir-biri bilan qo'shishga doir misol:

Source code

• 
  importutil.*;
  
• 
   
  
• 
  classTestCollection4{
  
• 
   
  
• 
  public static void main(String args[]){
  
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  ArrayList<String> al=new ArrayList<String>();
  
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  add("Aziz");
  
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  add("Zafar");
  
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  add("Jalol");
  
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• 
  ArrayList<String> al2=newArrayList<String>();
  
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  add("Fayzullo");
  
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  add("Jamshid");
  
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  addAll(al2);
  
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  Iterator itr=al.iterator();
  
• 
   
  
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  while(itr.hasNext()){
  
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  out.println(itr.next());
  
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  }
  
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  }
  
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  }
  

Ekranda :

Aziz

Zafar

Jalol

Fayzullo

Jamshid


Massivni ArrayListga qo'shishga doir ba'zi usullar

import java.util.*;




public class ArrayToArrayList {

public static void main(String[] args) {

/*ArrayList e'lon qilish va qiymat berish*/

String citynames[]={"Andijon", "Namangan", "Farg'ona", "Qo'qon"};

/*Array ni ArrayList'ga o'girish */

ArrayList<String> citylist= new ArrayList<String>(Arrays.asList(citynames));

/*Adding new elements to the converted List*/

citylist.add("Pop");

citylist.add("Chust");

/*Final ArrayList content display using for*/

for (String str: citylist)

{

System.out.println(str);

}

}

}

Ekranda:

Andijon

Namangan

Farg'ona

Qo'qon

Pop

Chust
Collections.addAll funksiyasidan foydalanib massivni Arraylist'ga qo'shish

import java.util.*;




public class Example2 {




public static void main(String[] args) {




/*ArrayList e'lon qilish va qiymat berish*/

String array[]={"Hi", "Hello", "Howdy", "Bye"};

/*ArrayList e'lon qilish*/

ArrayList<String> arraylist= new ArrayList<String>();

/*O'girish*/

Collections.addAll(arraylist, array);

/*o'girilgan List ga yangi element qo'shish*/

arraylist.add("String1"); arraylist.add("String2");

/*massiv ro'yhatini ko'rsatish*/

for (String str: arraylist)

{

System.out.println(str);

}

}

}
Ekranda:

Hi

Hello

Howdy

Bye

String1

String2
Collection ning methodlaridan foydalanmasdan oddiy sikil yordamida qo'shish

import java.util.*;




public class Details {

public static void main(String[] args) {

/*ArrayList e'lon qilindi*/

ArrayList arraylist= new ArrayList();

/*Array qiymatlashtirildi*/

String array[] = {"Text1","Text2","Text3","Text4"};

/*array.length massivda ko'rsatib turilgan elementlar sonini qaytaradi*/




for(int i =0;i<array.length;i++)

{

/* We are adding each array's element to the ArrayList*/

arraylist.add(array[i]);

}

/*ArrayList content*/

for(String str: arraylist)

{

System.out.println(str);

}

}

}

Ekranda:

Text1

Text2

Text3

Text4
Endi esa yozgan jarayonlarimizni teskarisi yani ArrayListdan massivaga o'girish usullariga doir misollar

Collection ning methodlaridan foydalanilmagan holda ArrayListni massivga o'girish

import java.util.*;




public class ArrayListTOArray {

public static void main(String[] args) {

/*ArrayList e'lon qilish va qiymat berish*/

ArrayList<String> arrlist= new ArrayList<String>();

arrlist.add("String1");

arrlist.add("String2");

arrlist.add("String3");

arrlist.add("String4");

/*ArrayList dan Array ga o'girish */

String array[] = new String[arrlist.size()];

for(int j =0;j

{

array[j] = arrlist.get(j);

}

/*Displaying Array elements*/

for(String k: array)

{

System.out.println(k);

}

}

}
Ekranda:

String1

String2

String3

String4
toArray funksiyasidan foydalanib list'ni massivga o'girish

import java.util.*;




public class Example {




public static void main(String[] args) {

/*ArrayList e'lon qilish va qiymat berish*/

ArrayList<String> friendsnames= new ArrayList<String>();

friendsnames.add("Aziz");

friendsnames.add("Zafar");

friendsnames.add("Jalol");

friendsnames.add("Fayzullo");

/*ArrayList dan Array ga o'girish */

String frnames[] = friendsnames.toArray(new String[friendsnames.size()]);

/*Array elementlarini ko'rsatish*/

for(String k: frnames)

{

System.out.println(k);

}

}

}
Ekranda:

Aziz

Zafar

Jalol

Fayzullo


24-dars. Javada LinkedList klassi
Javada LinkedList doubly linked listdan foydalanib elementlarni yig'adi. U AbstractList klassidan meros(extends) oladi va List va Deque interface'lardan implement oladi. ArrayListdan farqlaridan ham biri Deque dan implement olishidir;

• 
  LinkedList'da bir xil elementlar saqlash mumkin;
  
• 
  LinkedList'da ma'lumotlar kiritilish ketma-ketligida saqlanadi;
  
• 
  LinkedList klass sinxron emas;
  
• 
  LinkedList klassda boshqarish jarayonlari tez sodir bo'ladi, chunki LinkedList'da elementlarni ko'chirib o'tkazilmaydi;
  
• 
  LinkedList list, stack yoki queue'lardan foydalanishi mumkin.
  

LinkedList da ham ma'lumotlar bilan ishlash ArrayList bilan deyarli bir xil amalga oshiriladi.

Source code

• 
  importutil.*;
  
• 
   
  
• 
  publicclass TestCollection7{
  
• 
   
  
• 
  public static void main(String args[]){
  
• 
   
  
• 
  LinkedList<String> al=new LinkedList<String>();
  
• 
   
  
• 
  add("Zafar");
  
• 
   
  
• 
  add("Aziz");
  
• 
   
  
• 
  add("Jalol");
  
• 
   
  
• 
  add("Zafar");
  
• 
   
  
• 
  Iterator<String> itr=al.iterator();
  
• 
   
  
• 
  while(itr.hasNext()){
  
• 
   
  
• 
  out.println(itr.next());
  
• 
   
  
• 
  }
  
• 
   
  
• 
  }
  
• 
   
  
• 
  }
  

ArrayList saqlangan ma'lumotlarni LinkedList ham saqlashi mumkin
LinkedListda'gi ma'lumotlarni ArrayListga qo'shib qo'yishga misol

Source code

• 
  import java.util.ArrayList;
  
• 
   
  
• 
  import java.util.LinkedList;
  
• 
   
  
• 
  import java.util.List;
  
• 
   
  
• 
   
  
•