代码结构

package com.wuming.oop2.demo05;
//person 人       父类
public class Person {//继承:java只有单继承，没有多继承，extends修饰public int money=10_0000_0000;private int money1=20;public int getMoney1() {return money1;}public void setMoney1(int money1) {this.money1 = money1;}public void say(){System.out.println("说了一句话");}// String看源码//Object
}

package com.wuming.oop2.demo05;
//学生 is 人   子类
public class Student extends Person{}

package com.wuming.oop2.demo05;
//Teacher is 人      子类
public class Teacher extends Person{}

package com.wuming.oop2;import com.wuming.oop2.demo05.Person;
import com.wuming.oop2.demo05.Student;public class Application {public static void main(String[] args) {Student student = new Student();student.say();System.out.println(student.money);//      System.out.println(student.money1);//Error:(11, 35) java: money1可以在com.wuming.oop2.demo05.Person中访问privateSystem.out.println(student.getMoney1());//Person给私有money1添加getter后可调用Person person = new Person();person.hashCode();//在java中所有的类都默认继承Object类}
}

说了一句话
1000000000
20