动物类及动物的部分行为（体现封装，继承和多态）

class Animal { public static void main(String[] args) { /*Animal c1 =  new Cat();
		c1.setName("加菲猫");
		c1.setLeg(4);
		System.out.println(c1.getName() + "是" + c1.getLeg() + "条腿");
		c1.eat();
		Cat c2 = (Cat)c1;
		c2.catchMouse();*/ method(new Cat("加菲猫",4)); method(new Dog("宾利",4)); } public static void method(Animal a) { System.out.println(a.getName() + "是" + a.getLeg() + "条腿"); if(a instanceof Cat) { Cat c1 = (Cat)a; c1.eat(); c1.catchMouse(); /*System.out.println(c1.getName() + "是" + c1.getLeg() + "条腿");*/ }else if(a instanceof Dog) { Dog d1 = (Dog)a; d1.eat(); d1.lookHome(); } } } class Animal { private String name; private int leg; public Animal() {} public Animal(String name,int leg) { this.name = name; this.leg = leg; } public void setName(String name) { this.name = name; } public String getName() { return name; } public void setLeg(int leg) { this.leg = leg; } public int getLeg() { return leg; } public void eat() { System.out.println("动物吃饭"); } } class Cat extends Animal { public Cat() {} public Cat(String name,int leg) { super(name,leg); } public void eat() { System.out.println(getName() + "吃鱼"); } public void catchMouse() { System.out.println(getName() + "老鼠"); } } class Dog extends Animal { public Dog() {} public Dog(String name,int leg) { super(name,leg); } public void eat() { System.out.println(getName() + "吃肉"); } public void lookHome() { System.out.println(getName() + "看家"); } } 

显示结果为：

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