Мобил қурилмалар учун операцион тизимлар

Ўзгарувчи ва методларга мурожаат:

• /* Объект яратиш*/
• ObjectReference = new Constructor();
• /* объект орқали ўзгарувчини чақириш */
• ObjectReference.variableName;
• /* объект орқали методни чақириш */
• ObjectReference.MethodName();

• Мисол:
• public class Puppy{
• int puppyAge;
• public Puppy(String name){
• System.out.println("Passed Name is :" + name );
• }
• public void setAge( int age ){
• puppyAge = age;
• }
• public int getAge( ){
• System.out.println("Puppy's age is :" + puppyAge );
• return puppyAge;
• }
• public static void main(String []args){
• Puppy myPuppy = new Puppy( "tommy" );
• myPuppy.setAge( 2 );
• myPuppy.getAge( );
• System.out.println("Variable Value :" + myPuppy.puppyAge );
• }
• }

• Натижа:
• Passed Name is :tommy
• Puppy's age is :2
• Variable Value :2

Encapsulation

• class Encapsulation {
• private int summa = 500;
• protected int smax = 45500;
• public int getSumma() {
• return this.summa;
• }
• }
• public class EncapsulationDemo {
• public static void main(String []argc) {
• Encapsulation d = new Encapsulation();
• System.out.println(d.getSumma());
• }
• }

• Encapsulation

• Encapsulation – бу синф ўзгарувчиларининг (майдонлари)
• ҳимояланганлиги

Inheritance

• Ворислик (inheritance) - бошқа бир синфдан ворис (насл) олиш.
• Java да насл олиш extends калит сўзидан фойдаланилади.
• Мисол:
• class Android extends MobilePhone { … }

• class MobilePhone {
• public void switch() {
• System.out.println(“Phone is switching");
• }
• }
• class Android extends MobilePhone {
• public void switchOS() {
• System.out.println(“Switching Android 4.4");
• }
• }
• public class Demo {
• public static void main(String []args) {
• Android kitkat = new Android();
• kitkat.switch();
• kitkat.switchOS();
• }
• }