继承
public class Animal{
public static void main(String[]args){
Cat2 cat2 = new Cat2();//创建一个Cat2对象
System.out.println(cat2.hobby);
}
}
class Cat1{//父类
String name = "大花猫";
String hobby = "鱼" ;
}
class Cat2 extends Cat1{//子类
String name = "小花猫";
}