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1、精品资料2.Java第六章程序练习.1. 定义一个Person类，含姓名、性别、年龄等字段；继承Person类设计Teacher类，增加职称、部门等字段；继承Person类设计Student类，增加学号、入学时间、专业等字段。定义各类的构造方法和toString（）方法，并分别创建对象进行测试。package a.b.c;class personString name;char sex;int age;public person(String name,char sex,int age)this.name = name;this.sex = sex;this.age = age;class S
2、tudent extends personString no;String enter;String major;public Student(String name,char sex,int age,String no,String enter,String major)super(name,sex,age);this.no = no;this.enter = enter;this.major = major;public String toString()return name+,+sex+,+no+,+enter+,+major;class Teacher extends personS
3、tring pro;String department;public Teacher(String name,char sex,int age,String pro,String department)super(name,sex,age);this.pro = pro;this.department = department;public String toString()return name+,+sex+,+age+,+pro+,+department;public class ex6_2public static void main(String args)Student no1 =
4、new Student(no1,W,20,001,2009/12,computer);System.out.println(学生的基本信息为：+no1);Teacher t1 = new Teacher(张三,M,43,教授,教科院);System.out.println(教室 的信息为：+t1);2. 改进例5-6的Circle类，提供若干求面积的方法，形态分别如下：Public double area()/求当前圆的面积Public static double area(double r)/求半径为r的圆的面积Public static double area(Circle c)/求参数指
5、定的圆的面积package a.b.c;class Circledouble r;public Circle(double r)this.r = r;public double area()return Math.PI*r*r;public static double area(Circle c)return Math.PI*c.r*c.r;public class ex6_3public static void main(String args)Circle c1 = new Circle(2);System.out.println(c1.area();System.out.println(Circle.area(2.5);System.out.println(Circle.area(c1);
