Java第二次作业

package first;

import java.util.Scanner;
class persons 
{
    private String name;
    private char sex;
    private int age;
    private String id;
    public persons(String name,char sex,int age,String id)
    {
        this.name=name;
        this.sex=sex;
        this.age=age;
        this.id=id;
    }
    public void outdata()
    {
        System.out.println(name+" "+sex+" "+age+" "+id);        
    }    
}
public class studentdata 
{
    public static void main(String[] args) 
    {
        Scanner scanner =new Scanner(System.in);
        System.out.println("请输入您要录入的学生数目：");
        int stunumber=scanner.nextInt();
        persons stu[]=new persons[stunumber];
        System.out.println("请录入学生信息：");
        for(int i=0;i<stu.length;i++)
        {
            System.out.println("请分别输入第"+(i+1)+"位学生的姓名、性别、年龄和身份证号码");
            String name=scanner.next();
            String ch=scanner.next();
            char sex=ch.charAt(0);
            int age=scanner.nextInt();
            String id=scanner.next();
            stu[i]=new persons(name,sex,age,id);
            System.out.println();
        }
        System.out.println();
        for(int i=0;i<stu.length;i++)
        {
            System.out.println("第"+(i+1)+"位学生的姓名、性别、年龄和身份证号码");
            stu[i].outdata();
        }
        scanner.close();
    }
    

}

class Phone
 {
     private String brand;
     private String model;
     public Phone(String brand,String model)
     {
         this.brand=brand;
         this.model=model;
     }
     public void OutputInformation()
     {
         System.out.println("品牌:"+brand+"     型号:"+model);
     }
 }
 public class TestPhone
 {
     public static void main(String args[])
     {
         Phone s[]= {
                         new Phone("华为","荣耀3c"),
                         new Phone("联想","A3600D"),
                         new Phone("小米","note"),
                    };
         for(int i=0;i<s.length;i++)
         {
             s[i].OutputInformation();
         }
     }

class Book
 {
     private String bookname;
     private String booknum;
     private String bookauthor;
     private String publishhouse;
     private String booktime;
     private int bookpage;
     private double bookprice;
     
     public Book(
                 String bookname, String booknum,
                 String bookauthor, String publishhouse,
                 String booktime, int bookpage,double bookprice
                 )
     {
         super();
         this.bookname = bookname;
         this.booknum = booknum;
         this.bookauthor = bookauthor;
         this.publishhouse = publishhouse;
         this.booktime = booktime;
         this.bookpage = bookpage;
         this.bookprice = bookprice;
    }
 
     public void OutputInformation()
     {
         System.out.println("书名:"+bookname+"   书号:"+booknum);
         System.out.println("主编:"+bookauthor+"   出版社："+publishhouse);
         System.out.println("出版时间:"+booktime+"  页数:"+bookpage);
         System.out.println("价格:"+bookprice);
     }
 }
 public class TestBook 
 {
     public static void main(String args[])
     {
         Book b1=new Book(
                           "Java从入门到精通","05884701",
                           "赵洛育","清华大学出版社","2016年10月",
                           564,69.80);
         Book b2=new Book(
                            "数据结构","06832301",
                            "殷人昆","清华大学出版社","2017年5月",
                            400,49.50);
         b1.OutputInformation();
         System.out.println();
         b2.OutputInformation();
     }
 
 }

class Circle
 {
     final static double PI=3.14;
     private double radius;
     public Circle()
     {
         radius=0;
     }
     public Circle(double r)
     {
         radius=r;
     }
     public double getRadius()
     {
         return radius;
     }
     public double getPerimeter() //计算圆的周长
    {
         return radius*2*PI;
     }
     public double getArea() //计算圆的面积
     {
         return radius*radius*PI;
     }
     
 }
class Cylinder extends Circle
 {
     double height;
     public Cylinder(double r,double h)
     {
         super(r);
         height=h;
     }
     public double getHeight() {
         return height;
     }
     public double getCylinderArea() //计算圆柱体表面积
     {
         return super.getPerimeter()*height+getArea()*2;
     }
    double getVol() //计算圆柱体的体积
     {
         return super.getArea()*height;
     }
     public void dispVol()
     {
         System.out.println("半径为："+getRadius());
         System.out.println("高为："+getHeight());
         System.out.println("底面积为："+getArea());
         System.out.println("表面积为："+getPerimeter());
         System.out.println("体积为："+getCylinderArea());
     }
     
 }
 public class TestCylinder 
 {
     public static void main(String[] args)
     {
         Cylinder c1=new Cylinder(10,20);
         Cylinder c2=new Cylinder(10,40);
         System.out.println("圆柱体c1：");
         c1.dispVol();
         System.out.println();
         System.out.println("圆柱体c2：");
         c2.dispVol();
         
     }
     
 }

 }