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();
}
}