继承性的格式:class A extends B{}
A:子类、派生类、subclass
B:父类、超类、基类、superclass
体现:
java中关于继承性的规定
package exer; public class ExtendsTest { public static void main(String[] args) { Person p=new Person(); Student s=new Student(); s.name="哈哈"; System.out.println(s.name); } } class Person{ String name; Person(){ } Person(String name){ this.name=name; } public void eat(){ System.out.println("吃"); } } class Student extends Person{ String score; Student(){ } public void study(){ System.out.println("学习"); } }