第六章习题

4.

package page2_169;


public interface Animal {
void shout();
}


class Dog implements Animal {


public void shout() {
System.out.println("W W");
}
}


class Cat implements Animal {


public void shout() {
System.out.println("M M");


}
}


class Pig implements Animal {


public void shout() {
System.out.println("! !");
}
}


class Store {
public static Animal get(String choice) {
if (choice.equalsIgnoreCase("dog")) {
return new Dog();
} else if (choice.equalsIgnoreCase("pig")) {
return new Pig();
} else {
return new Cat();
}


}

}

package page2_169;


public class AnimalTest {
       public static void main(String[] args) {
  Animal a1=Store.get("pig");
  a1.shout();
}

}

5.

package page2_169;


public interface Eatable {
public void eat();
}

package page2_169;


public interface FlyingDiscCatchable {
      public void catchingFlyDisc();

}

package page2_169;


public interface Swimmable {
      public void swim();
}

package page2_169;


public abstract class Pet {
private String name;
private int health;
private int love;
    
   
public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public int getHealth() {
return health;
}

public void setHealth(int health) {
this.health = health;
}

public int getLove() {
return love;
}

public void setLove(int love) {
this.love = love;
}

public abstract void print();
    
}

package page2_169;


public class Dog1 extends Pet implements FlyingDiscCatchable, Eatable {



public void eat() {
System.out.println("狗吃饭");

}



public void catchingFlyDisc() {
System.out.println("狗接飞盘");

}



public void print() {
System.out.println("宠物的自白:\n我的名字叫"+this.getName()+",健康值是"+this.getHealth()+",和主人的亲密度是"+this.getLove());
}

}

package page2_169;


public class Penguin extends Pet implements Eatable, Swimmable {




public void swim() {
System.out.println("企鹅在游泳");


}



public void eat() {
System.out.println("企鹅在吃鱼");

}



public void print() {
System.out.println("宠物的自白:\n我的名字叫"+this.getName()+",健康值是"+this.getHealth()+",和主人的亲密度是"+this.getLove());

}

}

package page2_169;


public class Test {
 public static void main(String[] args) {
Dog1 dog=new Dog1();
dog.eat();
Penguin penguin=new Penguin();
penguin.swim();
dog.catchingFlyDisc();
penguin.setName("小白");
penguin.setHealth(100);
penguin.setLove(50);
penguin.print();
}
}