bird and cow sound

Points: 60

Time limit: 1.0s

Memory limit: 256M

Authors:

scu09156238, scu09156146

Problem type

Allowed languages

Java 19, Java 8

題目說明

請透過以下提示，覆寫speak()分別讓他們輸出鳥叫聲tweak!和牛叫聲moo!在class bird和class cow中

class animal {
    void speak() {
        System.out.println("The animal makes a sound.");
    }
}

class bird extends animal {
    @Override
    /*
    輸入在此
    */
}

class cow extends animal {
    @Override
    /*
    輸入在此
    */
}

public class t05311 {
    public static void main(String[] args) {
        animal genericanimal = new animal();
        bird mybird = new bird();
        cow mycow = new cow();
        animal animals[] = {genericanimal, mybird, mycow};
        for (animal animal : animals) {
            animal.speak();
        }
    }
}

輸入

這題不用輸入

輸出

分別輸出speak()

測試資料輸入

這題不用輸入

測試資料輸出

The animal makes a sound.
tweak!
moo!
//若直接print結果出來將不予計分!

Comments

scu09156146 commented on June 4, 2024, 3:13 p.m.

題解

參考課堂範例A290

class animal {              // 父類別
    void speak() {
        System.out.println("The animal makes a sound.");
    }
}

class bird extends animal { // 子類別，繼承父類別(animal)
    @Override
    void speak() {  // 覆寫父類別的函數
        System.out.println("tweak!");
    }
}

class cow extends animal {  // 子類別，繼承父類別(animal)
    @Override
    void speak() {  // 覆寫父類別的函數
        System.out.println("moo!");
    }
}

public class SuperClass {
    public static void main(String[] args) {
        animal genericanimal = new animal();
        bird mybird = new bird();
        cow mycow = new cow();
        animal animals[] = {genericanimal, mybird, mycow};  // 三種class
        for (animal animal : animals) {
            animal.speak();
        }
    }
}