赵栋201771010137《面向对象程序设计（java）》第六周学习总结(代码片段)

public class ManagerTest



   public static void main(String[] args)

   

      // 构造一个mananger对象

      Manager boss = new Manager("Carl Cracker", 80000, 1987, 12, 15);

      boss.setBonus(5000);

 

      Employee[] staff = new Employee[3];

 

      // 使用employee 和mananger对象填补staff数组

 

      staff[0] = boss;

      staff[1] = new Employee("Harry Hacker", 50000, 1989, 10, 1);

      staff[2] = new Employee("Tommy Tester", 40000, 1990, 3, 15);

 

      // 显示所有employee对象的所有信息

      for (Employee e : staff)

         System.out.println("name=" + e.getName() + ",salary=" + e.getSalary());

   

public class PersonTest



   public static void main(String[] args)

   

      Person[] people = new Person[2];

 

      // 以employ和student对象填充people数组

      people[0] = new Employee("Harry Hacker", 50000, 1989, 10, 1);

      people[1] = new Student("Maria Morris", "computer science");

 

      // 显示所有Person对象的姓名和描述

      for (Person p : people)

         System.out.println(p.getName() + ", " + p.getDescription());

   

public class Employee



   private String name;

   private double salary;

   private LocalDate hireDay;

 

   public Employee(String name, double salary, int year, int month, int day)

   

      this.name = name;

      this.salary = salary;

      hireDay = LocalDate.of(year, month, day);

   

 

   public String getName()

   

      return name;

   

 

   public double getSalary()

   

      return salary;

   

 

   public LocalDate getHireDay()

   

      return hireDay;

   

 

   public void raiseSalary(double byPercent)

   

      double raise = salary * byPercent / 100;

      salary += raise;

   

 

   public boolean equals(Object otherObject)

   

      // 快速测试以查看对象是否相同

      if (this == otherObject) return true;

 

      // 如果explicit的参数为null，必须返回false

      if (otherObject == null) return false;

 

      // 如果类不匹配，那么他们不能相等

      if (getClass() != otherObject.getClass()) return false;

 

      // 现在我们知道otherObject是一个非null的Employee类

      Employee other = (Employee) otherObject;

 

      // 测试字段是否具有相同的值

      return Objects.equals(name, other.name) && salary == other.salary && Objects.equals(hireDay, other.hireDay);

   

 

   public int hashCode()

   

      return Objects.hash(name, salary, hireDay); 

   

 

   public String toString()

   

      return getClass().getName() + "[name=" + name + ",salary=" + salary + ",hireDay=" + hireDay

            + "]";

   

public class ArrayListTest



   public static void main(String[] args)

   

      // 用三个Employee对象填补staff数组列表

      ArrayList<Employee> staff = new ArrayList<>();

 

      staff.add(new Employee("Carl Cracker", 75000, 1987, 12, 15));

      staff.add(new Employee("Harry Hacker", 50000, 1989, 10, 1));

      staff.add(new Employee("Tony Tester", 40000, 1990, 3, 15));

 

      // 将每个人的工资提升5%

      for (Employee e : staff)

         e.raiseSalary(5);

 

      //显示employ对象的所有信息

      for (Employee e : staff)

         System.out.println("name=" + e.getName() + ",salary=" + e.getSalary() + ",hireDay="

               + e.getHireDay());

   

import java.util.*;

/**
 * This program demonstrates enumerated types.
 * @version 1.0 2004-05-24
 * @author Cay Horstmann
 */
public class EnumTest
  
   public static void main(String[] args)
     
      Scanner in = new Scanner(System.in);
      System.out.print("Enter a size: (SMALL, MEDIUM, LARGE, EXTRA_LARGE) ");
      String input = in.next().toUpperCase();
      Size size = Enum.valueOf(Size.class, input);
      System.out.println("size=" + size);
      System.out.println("abbreviation=" + size.getAbbreviation());
      if (size == Size.EXTRA_LARGE)//判断语句
         System.out.println("Good job--you paid attention to the _.");      
   


enum Size

   SMALL("S"), MEDIUM("M"), LARGE("L"), EXTRA_LARGE("XL");

   private Size(String abbreviation)  this.abbreviation = abbreviation; 
   public String getAbbreviation()  return abbreviation; 

   private String abbreviation;

import java.util.Scanner;

public class cirec 

double PI=3.14;

public double AllArea(Shape score[])

    

    double sum=0;

    for(int i=0;i<score.length;i++)

        sum+= score[i].getArea();

        return sum;

    

    public double AllPerimeter(Shape score[])

    

    double sum=0;

    for(int i=0;i<score.length;i++)

        sum+= score[i].getPerimeter();

        return sum;

    

    

public static void main(String[] args) 

       Scanner in = new Scanner(System.in);

       System.out.println("请输入创建图形的个数");

       int a = in.nextInt();

       System.out.println("请输入图形种类（选择输入cir或rect）");

       String rect="rect";

       String cir="cir";

       Shape[] num=new Shape[a];

       for(int i=0;i<a;i++)

          String input=in.next();

       if(input.equals(rect)) 

          System.out.println("请输入长和宽");

        int width = in.nextInt();

        int length = in.nextInt();

         num[i]=new 长方形(width,length);

         System.out.println("长方形["+"长方形的长为:"+length+"  长方形的宽为:"+width+"]");

         

       if(input.equals(cir)) 

           System.out.println("输入所创建的圆的半径");

       int r = in.nextInt();

       num[i]=new 圆形(r); 

       System.out.println("圆["+"圆的半径为:"+r+"]");

       

       

       cirec c=new cirec();

       System.out.println("求所有图形的面积和：");

       System.out.println(c.AllPerimeter(num));

       System.out.println("求所有图形的周长和：");

       System.out.println(c.AllArea(num));

 for(Shape s:num) 

        System.out.println(s.getClass()+","+s.getClass().getSuperclass());

        

      

     

abstract class Shape  

   abstract double getPerimeter(); 

   abstract double getArea(); 

   

   

class 圆形extends Shape

   private double PI=3.14;

   private int r;

   public 圆形(int r) 

      this.r = r;

       

   double getPerimeter()

   return 2 * PI * r;

   

   double getArea()

   return r * r*PI;

   



 

class 长方形extends Shape 

private int width;

private int length;

    public 长方形(int length, int width) 

    this.width = width;

    this.length = length;

    

    double getPerimeter() 

       return 2*(length+width);

    

    double getArea()

    return length*width; 

    

public class people 

  

      private    String name;

      private    String number;

     private    String age;

      private    String sex;

      private    String address; 

     public String getName()

     

         return name;

     

     public void setName(String name) 

     

         this.name = name;

     

     public String getnumber() 

     

         return number;

     

     public void setnumber(String number)

    

         this.number = number;

     

     public String getage() 

     

         return age;

     

     public void setage(String age ) 

     

         this.age = age;

     

     public String getsex() 

     

         return sex;

     

     public void setsex(String sex ) 

     

         this.sex = sex;

     

     public String getaddress() 

     

         return address;

     

     public void setaddress(String address) 

     

         this.address = address;

     

 

import java.io.BufferedReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.InputStreamReader;

import java.util.ArrayList;

import java.util.Scanner;


public class Demo3 


private static ArrayList<people> peoplelist;

 

public static void main(String[] args) 

peoplelist = new ArrayList<>();

Scanner scanner = new Scanner(System.in);

File file = new File("/Users/eleanorliu/Desktop/学习/java文件/实验六/身份证号.txt");


try 

FileInputStream fis = new FileInputStream(file);


BufferedReader in = new BufferedReader(new InputStreamReader(fis));

String temp = null;


while ((temp = in.readLine()) != null) 


Scanner linescanner = new Scanner(temp);

                linescanner.useDelimiter(" ");    

                String name = linescanner.next();

                String id = linescanner.next();

                String sex = linescanner.next();

                String age = linescanner.next();

                String address = linescanner.nextLine();

                People people = new People();

                people.setName(name);

                people.setid(id);

                people.setage(age);

                people.setsex(sex);

                people.setaddress(address);

                peoplelist.add(people);

 


 

 catch (FileNotFoundException e) 

// TODO Auto-generated catch block

System.out.println("身份信息文件找不到");

e.printStackTrace();

 catch (IOException e) 

// TODO Auto-generated catch block

System.out.println("身份信息文件读取错误");

e.printStackTrace();




boolean isTrue = true;

while (isTrue) 

 

System.out.println("欢迎来到人员身份信息查询系统,请选择你的操作");

System.out.println("1.按姓名查询");

System.out.println("2.身份证号码查询");

System.out.println("3.退出");

int nextInt = scanner.nextInt();

switch (nextInt) 

case 1:

System.out.println("请输入姓名");

String peoplename = scanner.next();

int nameint = findPeopleByname(peoplename);

if (nameint != -1) 


System.out.println(" 姓名:"+ people.getName() +

                    "  身份证号:"+ people.getnumber() +

                         "   年龄:"+ people.getage()+

                         "   性别:"+ people.getsex()+

                         "   地址:"+ people.getplace()

                );

 else 

System.out.println("不存在该人信息");



break;

case 2:

System.out.println("请输入学号");

String studentid = scanner.next();

int idint = findPeopleByid(studentid);

if (idint != -1) 


System.out.println(" 姓名:"+ people.getName() +

                    "  身份证号:"+ people.getnumber() +

                        "   年龄:"+ people.getage()+

                        "   性别:"+ people.getsex()+

                        "   地址:"+ people.getplace()

                );

 else 

System.out.println("不存在该人信息");



break;

case 3:

isTrue = false;

System.out.println("程序已退出!");

break;

default:

             System.out.println("输入有误");







 



public static int findPeopleByname(String name) 

int flag = -1;

for (int i = 0; i < peoplelist.size(); i++) 

if (peoplelist.get(i).getName().equals(name)) 

flag = i;





return flag;

 




public static int findPeopleByid(String id) 

int flag = -1;


for (int i = 0; i < peoplelist.size(); i++) 

if (peoplelist.get(i).getId().equals(id)) 

flag = i;





return flag;