? ????? Java? ??? ??? ?????? ????? ??? 'is-a' ??? ???, ?? ?? ?????? ????? ??? ???? ??? ??? ? ??? ?????. ???? ???? ??????? ??? ??? ??? ? ???? ?? ?? ??????? ?? ???? ???? ??????.

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Java?? ?? ? ?? ???(?? ???)? ?? ???(?? ??? ?? ?? ???) ?? ??? ?? ???? ??? ???? ?? ???? ?? ???? ???? is-a ?????(?? ??? ??? ????). ??)(CSU Global, n.d)?? ??? ??????. ?, ??? B? ??? A??? ???? ?? ??? B? ??? A? "a" ?????. ? ??? ?? ??? B? ??? A? ???? ?? ??(?? ?? ??)? ???? ??? ??? ??? ??? ??? ?? ????. ?? ?? ??/?? ??? A? ?? ?? ?? ??? ??????. ??? ????? ?? ???? ??? ???? ? ?????.

“???? ??? ??? ???? ?? ??? ??? ??? ?? ? ??? ???? ??? ????. ? ??? ?? ?? ????? ? Java ??? ?? ???? ??? ? ????. ???? ?? ???? ??? ??? ?????? ?? ???? ??? ?? ? ??? ??? ? ????.”(The Java? Tutorials, n.d.) ?? ?? ????? ??? ???? ?? ?? ?? ???? ?? ??? ??? ? ?? ?????.

?: ?, ???, ???? ?????.

?????

public class Animal {
    public void makeSound() {
        System.out.println("Makes a Sound");
    }
}

??? ?? ???

public class Domesticated extends Animal {
    public void friendly() {
        System.out.println("This animal is friendly.");
    }
}

??? ?? ???

public class Undomesticated extends Animal {
    public void notFriendly() {
        System.out.println("This animal is not friendly.");
    }
}

??? ?? ???

public class Cat extends Domesticated {
    @Override
    public void makeSound() {
        System.out.println("Meow");
    }
}

Undomesticated? ?? ???

public class Owl extends Undomesticated {
    @Override
    public void makeSound() {
        System.out.println("Hoots");
    }
}

??? ???? ?? ???

public class inheritanceExample {
    public static void main(String[] args) {
        Dog myDog = new Dog();
        Cat myCat = new Cat();
        Owl redOwl = new Owl();

        System.out.println("MY Dog:");
        myDog.makeSound(); // Outputs: Bark
        myDog.friendly();  // Outputs: This animal is friendly.
        System.out.println();

        System.out.println("My Cat:");
        myCat.makeSound(); // Outputs: Meow
        myCat.friendly();  // Outputs: This animal is friendly.
        System.out.println();

        System.out.println("Red Owl:");
        redOwl.makeSound(); // Outputs: Hoot
        redOwl.notFriendly(); // Outputs: This animal is not friendly.
     }
}

??: Dog ? Cat ???? makeSound() ???? Animal ???? makeSound() ???? ??????.

?? Dog ???? Animal ???? ?? ???? Domesticated ???? ?? ??????.

'→'? ??

Java?? ?? ???? ??? ?????? ?? ? ????. ?? ?? Dog ???? Domesticated ?????? Animal ?????? ?? ? ??? ??? ???? ????.

?, ?????? ??? ?????? ?? ? ???, ??, ???, ????? ?? ? ?? ? ????.

????? Java? ??? ?? ?? ???? ?????? ??? ?? ? ???? "is-a" ??? ???? ???? ??? ? ????. ?? ?? ????? ???? ?? ??? ????? ?? ???? ?? ??? ????? ?? ????, ??? ? ???? ??????.

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????:

CUS ???(n.d.). ?? 1: ?? ?? [??? ??]. Colorado State University Global, CSC372: ????? II, ??? ???. ???. 2024? 6? 8?? ???, https://csuglobal.instructure.com/courses/94948/pages/module-1-overview?module_item_id=4868813

Java? ???(n.d.). Java ?? ??: ?????? ??. ??. 2024? 6? 8?? ???, https://docs.oracle.com/javase/tutorial/java/IandI/polymorphism.html

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??? 2024? 11? 1? Level UP Coding?? ??? Medium? Alex.omegapy? ???????.

? ??? Java? ?? ? ???: ????? ? ????? ??? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!