• java学习49天2020/8/23


    1 import java.util.Scanner;
     2 //点类
     3 class Point{
     4     private float x; //横坐标
     5     private float y; //纵坐标
     6     public Point(){
     7     }
     8     public Point(float x,float y) {
     9         this.x=x;
    10         this.y=y;
    11     }
    12     public float getX() {
    13         return x;
    14     }
    15     public float getY() {
    16         return y;
    17     }
    18 }
    19 //矩形类
    20 public class Rectangle {
    21     private Point p1=new Point(); //矩形左下角点
    22     private Point p2=new Point(); //矩形右上角点
    23     public Rectangle() {
    24     }
    25     public Rectangle(Point p1, Point p2) {
    26         this.p1 = p1;
    27         this.p2 = p2;
    28     }
    29     //计算矩形面积
    30     public void Area() {
    31         double s;
    32         s=(double)Math.abs((p2.getX()-p1.getX())*(p2.getY()-p1.getY()));
    33         System.out.println(s);
    34     }
    35     public static void main(String[] args) {
    36         Scanner in=new Scanner(System.in);
    37         float a,b,c,d;
    38         System.out.print("请输入矩形左下角点的坐标:");
    39         a=in.nextFloat();
    40         b=in.nextFloat();
    41         System.out.print("请输入矩形右上角点的坐标:");
    42         c=in.nextFloat();
    43         d=in.nextFloat();
    44         Point p1=new Point(a,b);
    45         Point p2=new Point(c,d);
    46         Rectangle r=new Rectangle(p1,p2);
    47         System.out.print("此矩形面积:");
    48         r.Area();
    49     }
    50 }
    

     

    import java.util.Scanner;
     2 //日期类
     3 class Date{
     4     private int year;
     5     private int month;
     6     private int day;
     7     public Date() {
     8     }
     9     public Date(int year,int month,int day) {
    10         this.year=year;
    11         this.month=month;
    12         this.day=day;
    13     }
    14     public void set() {
    15         Scanner in=new Scanner(System.in);
    16         year=in.nextInt();
    17         month=in.nextInt();
    18         day=in.nextInt();
    19     }
    20     public void display() {
    21         System.out.println(year+"."+month+"."+day);
    22     }
    23 }
    24 //人员类
    25 public class People {
    26     private int num; //编号
    27     private String sex; //性别
    28     private Date date=new Date(); //出生日期
    29     private String ID; //身份证号
    30     public People() {
    31     }
    32     public People(int num, String sex, Date date, String iD) {
    33         super();
    34         this.num = num;
    35         this.sex = sex;
    36         this.date = date;
    37         ID = iD;
    38     }
    39     public void input() {
    40         Scanner in=new Scanner(System.in);
    41         System.out.println("请输入人员信息:");
    42         System.out.print("编号:");
    43         num=in.nextInt();
    44         System.out.print("性别:");
    45         sex=in.next();
    46         System.out.print("出生日期:");
    47         date.set();
    48         System.out.print("身份证号:");
    49         ID=in.next();
    50     }
    51     public void output() {
    52         System.out.println("编号:"+num);
    53         System.out.println("性别:"+sex);
    54         System.out.println("出生日期:");
    55         date.display();
    56         System.out.println("身份证号:"+ID);
    57     }
    58     public static void main(String[] args) {
    59         People p=new People();
    60         p.input();
    61         p.output();
    62     }
    63 }
    

     

     二

    三.例题

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  • 原文地址:https://www.cnblogs.com/qiangini/p/13583405.html
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