继承类

package student;public class student {    String name;     String sex;     int age;     int grade;     int no;     String school;    void Intfo(String m,String n,int i,int j,int a)    {        name=m;        sex=n;        age=i;        grade=j;        no=a;    }    void  showInfo()    {         System.out.println("姓名:"+name);         System.out.println("性别:"+sex);         System.out.println("年龄:"+age);         System.out.println("成绩:"+grade);         System.out.println("编号:"+no);    }    public class people extends student{        String school;      }    void  setInfo(String school_name)    {        school=school_name;    }    void  showInfo1(){        System.out.println("姓名:"+name);         System.out.println("性别:"+sex);         System.out.println("年龄:"+age);         System.out.println("成绩:"+grade);         System.out.println("编号:"+no);    }public static void main(String[] args) {    // TODO 自动生成的方法存根     System.out.println("请输入第一个人的信息");     student huxin=new student();     huxin.name="胡歆";     huxin.sex="女";     huxin.age=20;     huxin.grade=98;     huxin.no=12;     huxin.school="贵州工程应用技术学院";     huxin.showInfo();     System.out.println("请输入第二个人的信息");     student wang=new student();     wang.name="王三";     wang.sex="男";     wang.age=20;     wang.grade=88;     wang.no=7;     wang.school="信息工程学院";     wang.showInfo();}}

结果如下:

知识点:
1,方法的重写.
2,成员变量的隐藏.