java程序:按要求编写程序: (1)编写抽象类Mammal(哺乳动物),拥有抽象方法void move()和void eat (); (2)维承Mammal类编写 Cheetah(猎豹)、Dolphin(海豚)、Bat(蝙蝠)三个类,分别为它们编写move()和eat()方法覆盖父类中的同名方法,方法被调用后在命令行中输出合适的内容。(如Bat的move()方法输出“I’m flying.”,eat()方法输出“I eat insect.”) (3)创建包含main方法的Test类,在main方法中创建专门用于存储Mammal对象的Arravlist<Mammal> list,并创建Cheetah、Dolphin、
时间: 2024-02-04 09:01:57 浏览: 22
Bat对象,并添加到list中。然后循环遍历list,依次调用每个对象的move()和eat()方法,观察输出的结果是否符合预期。
以下是Java程序的代码实现:
Mammal.java
```
public abstract class Mammal {
public abstract void move();
public abstract void eat();
}
```
Cheetah.java
```
public class Cheetah extends Mammal {
@Override
public void move() {
System.out.println("I'm running.");
}
@Override
public void eat() {
System.out.println("I eat meat.");
}
}
```
Dolphin.java
```
public class Dolphin extends Mammal {
@Override
public void move() {
System.out.println("I'm swimming.");
}
@Override
public void eat() {
System.out.println("I eat fish.");
}
}
```
Bat.java
```
public class Bat extends Mammal {
@Override
public void move() {
System.out.println("I'm flying.");
}
@Override
public void eat() {
System.out.println("I eat insect.");
}
}
```
Test.java
```
import java.util.ArrayList;
public class Test {
public static void main(String[] args) {
ArrayList<Mammal> list = new ArrayList<>();
list.add(new Cheetah());
list.add(new Dolphin());
list.add(new Bat());
for (Mammal mammal : list) {
mammal.move();
mammal.eat();
}
}
}
```
运行程序后,输出结果为:
```
I'm running.
I eat meat.
I'm swimming.
I eat fish.
I'm flying.
I eat insect.
```
可以看到,每个对象的move()和eat()方法都被正确地覆盖并输出了相应的内容,程序运行符合预期。