Ushbu postda biz eng keng tarqalgan Java ArrayList usullarini har bir usul uchun kod misollari bilan yoritamiz.
ArrayList
class - o'lchamlari o'zgaruvchan qator. Biz odatda ArrayList
dan foydalanamiz ro'yxatning hajmini oldindan bilmaganimizda.
ArrayList
sinf java.util
paket.
ArrayList yaratish va unga elementlarni qo'shish uchun biz ArrayList
ni o'rnatamiz String
kabi belgilangan turga ega ob'ekt yoki Integer
.
add()
Ga e'tibor bering usuli elementni ArrayList-ning keyingi holatiga qo'shadi. Ob'ektni ma'lum bir indeksga qanday qo'shishni ko'rish uchun keyingi misolga qarang.
import java.util.ArrayList; public class ArrayListTutorial { public static void main(String[] args) {
ArrayList fruitBasket = new ArrayList();
fruitBasket.add('Apple');
fruitBasket.add('Banana');
fruitBasket.add('Grapes');
fruitBasket.add('Orange');
System.out.println(fruitBasket); } }
Chiqish:
[Apple, Banana, Grapes, Orange]
Ob'ektni belgilangan joyga qo'shish uchun add()
ga kerakli indeksni taqdim etishimiz kerak usul.
import java.util.ArrayList; public class ArrayListTutorial { public static void main(String[] args) {
ArrayList fruitBasket = new ArrayList();
fruitBasket.add('Apple');
fruitBasket.add('Banana');
fruitBasket.add('Grapes');
fruitBasket.add('Orange');
fruitBasket.add(2, 'Melon');
System.out.println(fruitBasket); } }
Chiqish:
[Apple, Banana, Melon, Grapes, Orange]
get()
usuli elementni oladi. Indeks raqamini get()
ga berishimiz kerak usul.
import java.util.ArrayList; public class ArrayListTutorial { public static void main(String[] args) {
ArrayList fruitBasket = new ArrayList();
fruitBasket.add('Apple');
fruitBasket.add('Banana');
fruitBasket.add('Grapes');
fruitBasket.add('Orange');
System.out.println(fruitBasket.get(1)); } }
Banana
Elementni olib tashlash uchun biz remove()
dan foydalanamiz usul. Indeks raqamini ko'rsatishimiz kerak.
import java.util.ArrayList; public class ArrayListTutorial { public static void main(String[] args) {
ArrayList fruitBasket = new ArrayList();
fruitBasket.add('Apple');
fruitBasket.add('Banana');
fruitBasket.add('Grapes');
fruitBasket.add('Orange');
fruitBasket.remove(0);
System.out.println(fruitBasket); } }
Chiqish:
[Banana, Grapes, Orange]
clear()
usuli barcha elementlarni ArrayList
dan o'chirib tashlaydi.
import java.util.ArrayList; public class ArrayListTutorial { public static void main(String[] args) {
ArrayList fruitBasket = new ArrayList();
fruitBasket.add('Apple');
fruitBasket.add('Banana');
fruitBasket.add('Grapes');
fruitBasket.add('Orange');
fruitBasket.clear();
System.out.println(fruitBasket); } }
[]
import java.util.ArrayList; public class ArrayListTutorial { public static void main(String[] args) {
ArrayList fruitBasket = new ArrayList();
fruitBasket.add('Apple');
fruitBasket.add('Banana');
fruitBasket.add('Grapes');
fruitBasket.add('Orange');
System.out.println(fruitBasket.size()); } }
Chiqish:
4
import java.util.ArrayList; public class ArrayListTutorial { public static void main(String[] args) {
ArrayList fruitBasket = new ArrayList();
fruitBasket.add('Apple');
fruitBasket.add('Banana');
fruitBasket.add('Grapes');
fruitBasket.add('Orange');
for (int i = 0; i < fruitBasket.size(); i++) {
System.out.println(fruitBasket.get(i));
} } }
Chiqish:
Apple Banana Grapes Orange
import java.util.ArrayList; public class ArrayListTutorial { public static void main(String[] args) {
ArrayList fruitBasket = new ArrayList();
fruitBasket.add('Apple');
fruitBasket.add('Banana');
fruitBasket.add('Grapes');
fruitBasket.add('Orange');
for (String i : fruitBasket) {
System.out.println(i);
} } }
Chiqish:
Apple Banana Grapes Orange
import java.util.ArrayList; public class ArrayListTutorial { public static void main(String[] args) {
ArrayList numbers = new ArrayList();
numbers.add(10);
numbers.add(20);
numbers.add(30);
numbers.add(40);
for (int i : numbers) {
System.out.println(i);
} } }
Chiqish:
10 20 30 40
replace()
usuli elementni boshqa taqdim etilgan element bilan almashtiradi. O'zgartirmoqchi bo'lgan narsaning indeksini ko'rsatishimiz kerak.
import java.util.ArrayList; public class ArrayListTutorial { public static void main(String[] args) {
ArrayList fruitBasket = new ArrayList();
fruitBasket.add('Apple');
fruitBasket.add('Banana');
fruitBasket.add('Grapes');
fruitBasket.add('Orange');
fruitBasket.set(3, 'Peach')
for (String i : fruitBasket) {
System.out.println(i);
} } }
Chiqish:
#before replace [Apple, Banana, Grapes, Orange] #after replace [Apple, Banana, Grapes, Peach]
shuffle()
usuli Collections
da class va ArrayList elementlarini tasodifiy aralashtirish uchun ishlatiladi.
import java.util.ArrayList; import java.util.ArrayList; import java.util.Collections; public class ArrayListTutorial { public static void main(String[] args) {
ArrayList fruitBasket = new ArrayList();
fruitBasket.add('Apple');
fruitBasket.add('Banana');
fruitBasket.add('Grapes');
fruitBasket.add('Orange');
System.out.println(fruitBasket);
Collections.shuffle(fruitBasket);
System.out.println(fruitBasket); } }
Chiqish:
#before shuffle [Apple, Banana, Grapes, Orange] #after shuffle [Grapes, Orange, Banana, Apple]
import java.util.ArrayList; import java.util.ArrayList; import java.util.Collections; public class ArrayListTutorial { public static void main(String[] args) {
ArrayList fruitBasket = new ArrayList();
fruitBasket.add('Orange');
fruitBasket.add('Apple');
fruitBasket.add('Grapes');
fruitBasket.add('Banana');
System.out.println(fruitBasket);
Collections.sort(fruitBasket);
System.out.println(fruitBasket); } }
Chiqish:
#before sort [Orange, Apple, Grapes, Banana] #after sort [Apple, Banana, Grapes, Orange]
public class ArrayListTutorial { public static void main(String[] args) {
ArrayList fruitBasket = new ArrayList();
fruitBasket.add('Apple');
fruitBasket.add('Banana');
fruitBasket.add('Grapes');
fruitBasket.add('Orange');
System.out.println(fruitBasket);
Collections.reverse(fruitBasket);
System.out.println(fruitBasket); } }
Chiqish:
#original list [Apple, Banana, Grapes, Orange] #after reverse [Orange, Grapes, Banana, Apple]
import java.util.ArrayList; public class ArrayListTutorial { public static void main(String[] args) {
ArrayList fruitBasket = new ArrayList();
fruitBasket.add('Apple');
fruitBasket.add('Banana');
fruitBasket.add('Grapes');
fruitBasket.add('Orange');
String[] fruitArray = new String[fruitBasket.size()];
fruitBasket.toArray(fruitArray);
for (String i : fruitArray) {
System.out.println(i);
} } }
Chiqish:
Apple Banana Grapes Orange
import java.util.ArrayList; import java.util.Collections; public class ArrayListTutorial { public static void main(String[] args) {
ArrayList fruitBasket = new ArrayList();
fruitBasket.add('Apple');
fruitBasket.add('Banana');
fruitBasket.add('Grapes');
fruitBasket.add('Orange');
System.out.println(fruitBasket1);
Collections.swap(fruitBasket, 1, 3);
System.out.println(fruitBasket); } }
Chiqish:
#before swap [Apple, Banana, Grapes, Orange] #after swap [Apple, Orange, Grapes, Banana]
import java.util.ArrayList; public class ArrayListTutorial { public static void main(String[] args) {
ArrayList fruitBasket1 = new ArrayList();
ArrayList fruitBasket2 = new ArrayList();
fruitBasket1.add('Apple');
fruitBasket1.add('Banana');
fruitBasket1.add('Grapes');
fruitBasket1.add('Orange');
fruitBasket2.add('Melon');
fruitBasket2.add('Strawberries');
fruitBasket1.addAll(fruitBasket2);
System.out.println(fruitBasket1); } }
Chiqish:
[Apple, Banana, Grapes, Orange, Melon, Strawberries]
Ushbu xabarda siz Java ArrayLists-dagi eng keng tarqalgan operatsiyalarning turli xil misollarini ko'rdingiz.