class DeliveredClass extends SuperClass {

    ...

}

ໝາຍເຫດ: ໃນການສືບຕອດນັ້ນຈະໃຊ້ຄຳສັ່ງ extends ໂດຍ SuperClass ນັ້ນເປັນຄາດຫຼັກທີ່ຈະສືບຕອດໄປທີ່ DeliveredClass ຫຼື ຄາດລຸກ

class Person {

    String name;

    int age;

    public Person () {

    }

    public Person (String name, int age) {

        this.name = name;

        this.age = age;

    }

    public void introduce () {

        System.out.println("My name is " + name);

    }

}

ໝາຍເຫດ: ແມ່ນເປັນຄາດ Person ໂດຍເຮົາຈະໃຊ້ຄາດນີ້ໃນການສືບຕອດຄຸນສົມບັດໃຫ້ກັບຄາດອື່ນ ເຊິ່ງໝາຍຄວາມວ່າຄາດນີ້ຈະເປັນ super class ນັ້ນເອງ

class Artist extends Person {

    String genre;

    public Artist (String name, int age){

        this.name = name;

        this.age = age;

    }

    public void playMusic () {

        System.out.println(name + " is playing " + genre + " music.");

    }

}

class Athlete extends Person {

    String sport;

    public Athlete (String name, int age){

        this.name = name;

        this.age = age;

    }

    public void playSport () {

        System.out.println(name + " is playing " + sport + ".");

    }

}

ໝາຍເຫດ: ຄາດ Artist ເປັນຄາດທີ່ສືບຕອດມາຈາກຄາດ Person ນັ້ນໝາຍຄວາມວ່າສະມາຊິກທັງໝົດຂອງ Person ຍົກເວັ້ນ constructor ແລະ ສະມາຊິກທີ່ເປັນ private ຈະບໍ່ຖືກສືບຕອດມານຳ ແລະ ເຮົາໄດ້ເພີ່ມຕົວແປຣໃຫ້ກັບຄາດນີ້ ຄື genre ເປັນຕົວແປຣສຳລັບປະເພດດົນຕີທີ່ມັກຫລິ້ນ ແລະ ເມຕອດ playMusic() ຫລິ້ນດົນຕີ

ຕໍ່ມາເປັນຄາດ Athlete ການສືບຕອດນັ້ນເປັນເຊັ່ນດຽວກັນກັບຄາດ Artist ເພາະສືບຕອດມາຈາກຄາດດຽວກັນ ແລະ ເຮົາໄດ້ເພີ່ມຕົວແປຣໃຫ້ກັບຄາດນີ້ ຄື sport ເປັນຕົວແປຣສຳລັບກີລາທີ່ມັກຫລິ້ນ ແລະ ເມຕອດ playSport() ເພື່ອຫລິ້ນຫຼິນກິລານັ້ນ

ເຮົາຍັງສ້າງ constructor ໃຫ້ກັບຄາດທັງສອງດ້ວຍ ເພາະວ່າ constructor ບໍ່ໄດ້ສືບຕອດ ຕໍ່ມາເປັນຕົວຢ່າງການໃຊ້ງານ ໂຄ້ດທັງໝົດ ແລະ ເຮັດການສ້າງອອບເຈັກ

public class InheritanceExample {

    public static void main (String[] args) {

        Artist art = new Artist("Marcus", 20);

        Athlete ath = new Athlete("Danny", 25);

        art.genre = "Trip Hop";

        ath.sport = "Football";

        art.introduce();

        art.playMusic();

        System.out.println();

        ath.introduce();

        ath.playSport();

    }

}

class Person {

    String name;

    int age;

    public Person () {

    }

    public Person (String name, int age) {

        this.name = name;

        this.age = age;

    }

    public void introduce () {

        System.out.println("My name is " + name);

    }

}

class Artist extends Person {

    String genre;

    public Artist (String name, int age){

        this.name = name;

        this.age = age;

    }

    public void playMusic () {

        System.out.println(name + " is playing " + genre + " music.");

    }

}

class Athlete extends Person {

    String sport;

    public Athlete (String name, int age){

        this.name = name;

        this.age = age;

    }

    public void playSport () {

        System.out.println(name + " is playing " + sport + ".");

    }

}

ໃນຕົວຢ່າງເຮົາໄດ້ສ້າງອອບເຈັກຈາກຄາດທັງສອງຂຶ້ນມາ ແລະ ກຳນົດຄ່າເຮົາສັງເກດວ່າໃນຄອນສະຕັກເຕີ delivered class ທັງສອງເຮົາໄດ້ໃຊ້ຄຳສັ່ງ this.name ກໍ່ຄືຕົວແປຣທີ່ສືບຕອດມາຈາກ super ຄາດ ແລ ະໃນເມຕອດ Main ຄຳສັ່ງ art.introduce() ແລະ ath.introduce() ຄືເມຕອດທີ່ຖືກສືບຕອດມາເຊັ່ນກັນ ສັງເກດວ່າເຮົາບໍ່ຕ້ອງປະກາດອີກໃນຕອນທີ່ສ້າງ delivered class ເຊິ່ງນິ້ເປັນອີກເຫດຜົນໜຶ່ງເຮັດໃຫ້ເຮົາສາມາດນຳໂຄ້ດເກົ່າມາໃຊ້ໄດ້ ໂດຍບໍ່ຕ້ອງຂຽນໃໝ່ທັງໝົດ

class Artist extends Person {

    String genre;

    public Artist (String name, int age){

        this.name = name;

        this.age = age;

    }

    @Override

    public void introduce () {

        System.out.println("My name is " + name);

        System.out.println("I'm an artist.");

    }

    public void playMusic () {

        System.out.println(name + " is playing " + genre + " music.");

    }

}

class Athlete extends Person {

    String sport;

    public Athlete (String name, int age){

        this.name = name;

        this.age = age;

    }

    @Override

    public void introduce () {

        System.out.println("My name is " + name);

        System.out.println("I'm an athlete.");

    }

    public void playSport () {

        System.out.println(name + " is playing " + sport + ".");

    }

}

ໝາຍເຫດ: ຈາກຕົວຢ່າງເປັນການ override ເມຕອດ introduce() ຈາກ super class ເພື່ອໃຫ້ບອກຄຳທັກທາຍທີ່ແຕກຕ່າງກັນອອກໄປສຳລັບແຕ່ອາຊີບ ຕອນນີ້ໃຫ້ເຮົາຄັດລອກຄາດທັງສອງໄປແທນທີແບບເກົ່າ ທີ່ບໍ່ມີການ override ແລ້ວຣັນໂປຣແກຣມໃໝ່

My name is Marcus

I'm an artist.

Marcus is playing Trip Hop music.

My name is Danny

I'm an athlete.

Danny is playing Football.

class Artist extends Person {

    String genre;

    public Artist (String name, int age){

        super(name, age);

    }

    @Override

    public void introduce () {

        super.introduce();

        System.out.println("I'm an artist.");

    }

    public void playMusic () {

        System.out.println(name + " is playing " + genre + " music.");

    }

}

class Athlete extends Person {

    String sport;

    public Athlete (String name, int age){

        super(name, age);

    }

    @Override

    public void introduce () {

        super.introduce();

        System.out.println("I'm an athlete.");

    }

    public void playSport () {

        System.out.println(name + " is playing " + sport + ".");

    }

}