4月17日 上机任务
1.编写“借书卡”类及其测试类。
6.1 “借书卡”类
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² 方法一：借书，显示本次借书数和可借书数
² 方法二：还书，显示本次还书数和可借书数
6.2 测试类
² 本次借书数 和 本次还书数，从键盘输入
2.编写“电费管理类”及其测试类。
7.1 “电费管理”类
² 属性：上月电表读数、本月电表读数
² 方法一：显示上月、本月电表读数
² 方法二：计算本月用电数
² 方法三：显示本月用电数
² 方法四：假设每度电的价格为1.2元，计算并显示本月电费
7.2 测试类
² 上月电表读数、本月电表读数，从键盘输入
1 package com.wsy.work.input; 2 import java.util.Scanner; 3 public class LibraryCardInput { 4 Scanner in = new Scanner(System.in); 5 private String accountNumber; 6 private String name; 7 private String IDCard; 8 private String address; 9 public void input() 10 { 11 System.out.println("请依次输入您的帐号、名字、身份证号、地址"); 12 accountNumber = in.nextLine(); 13 name = in.nextLine(); 14 IDCard = in.nextLine(); 15 address = in.nextLine(); 16 } 17 18 public String getAccountNumber() { 19 return accountNumber; 20 } 21 public void setAccountNumber(String accountNumber) { 22 this.accountNumber = accountNumber; 23 } 24 public String getName() { 25 return name; 26 } 27 public void setName(String name) { 28 this.name = name; 29 } 30 public String getIDCard() { 31 return IDCard; 32 } 33 public void setIDCard(String iDCard) { 34 IDCard = iDCard; 35 } 36 public String getAddress() { 37 return address; 38 } 39 public void setAddress(String address) { 40 this.address = address; 41 } 42 43 }
1 package com.wsy.work.type; 2 public class LibraryCard { 3 private static int bookTotal = 100; 4 private String accountNumber; 5 private String name; 6 private String IDCard; 7 private String address; 8 private int borrowedNumber = 0; 9 private int borrowableNumber = bookTotal; 10 public LibraryCard(String accountNumber, String name, String IDCard, String address) { 11 this.accountNumber = accountNumber; 12 this.name = name; 13 this.IDCard = IDCard; 14 this.address = address; 15 } 16 public void prompt() 17 { 18 System.out.println("欢迎来到图书馆"); 19 System.out.println("请输入1-4"); 20 System.out.println("1:查看书店总书数"); 21 System.out.println("2:借书"); 22 System.out.println("3:还书"); 23 System.out.println("4.退出"); 24 } 25 public void borrowBook(int thisBorrowNumber) 26 { 27 if(thisBorrowNumber > borrowableNumber) 28 { 29 System.out.println("已超过最大可借书数"); 30 return; 31 } 32 System.out.println("本次需借书:"+thisBorrowNumber+"本"); 33 borrowableNumber = borrowableNumber - thisBorrowNumber ; 34 borrowedNumber = borrowedNumber + thisBorrowNumber ; 35 System.out.println("图书还可借书:"+borrowableNumber+"本"); 36 } 37 public void returnBook(int thisReturnNumber) 38 { 39 if(thisReturnNumber > borrowedNumber ) 40 { 41 System.out.print("error"); 42 return ; 43 } 44 System.out.println("本次还书:"+thisReturnNumber+"本"); 45 borrowableNumber = borrowableNumber + thisReturnNumber; 46 borrowedNumber = borrowedNumber - thisReturnNumber; 47 System.out.println("图书馆还可借:"+borrowableNumber+"本"); 48 } 49 public static int getBookTotal() { 50 return bookTotal; 51 } 52 public static void setBookTotal(int bookTotal) { 53 LibraryCard.bookTotal = bookTotal; 54 } 55 public String getAccountNumber() { 56 return accountNumber; 57 } 58 public void setAccountNumber(String accountNumber) { 59 this.accountNumber = accountNumber; 60 } 61 public String getName() { 62 return name; 63 } 64 public void setName(String name) { 65 this.name = name; 66 } 67 public String getIDCard() { 68 return IDCard; 69 } 70 public void setIDCard(String iDCard) { 71 IDCard = iDCard; 72 } 73 public String getAddress() { 74 return address; 75 } 76 public void setAddress(String address) { 77 this.address = address; 78 } 79 public int getBorrowedNumber() { 80 return borrowedNumber; 81 } 82 public void setBorrowedNumber(int borrowedNumber) { 83 this.borrowedNumber = borrowedNumber; 84 } 85 public int getBorrowableNumber() { 86 return borrowableNumber; 87 } 88 public void setBorrowableNumber(int borrowableNumber) { 89 this.borrowableNumber = borrowableNumber; 90 } 91 92 }
1 package com.wsy.work.test; 2 import com.wsy.work.input.*; 3 import com.wsy.work.type.*; 4 import java.util.Scanner; 5 public class LibraryCardTest { 6 7 public static void main(String[] args) { 8 LibraryCardInput input = new LibraryCardInput(); 9 input.input(); 10 LibraryCard card = new LibraryCard(input.getAccountNumber() , input.getName() , input.getIDCard() , input.getAddress()); 11 Scanner in = new Scanner(System.in); 12 int n; 13 int number; 14 exit: 15 while(true) 16 { 17 card.prompt(); 18 n = in.nextInt(); 19 switch(n) 20 { 21 case 1: 22 System.out.println("本书店中还剩下"+card.getBorrowableNumber()+"本书"); 23 break; 24 case 2: 25 System.out.print("请输入您需要借多少本书:"); 26 number = in.nextInt(); 27 card.borrowBook(number); 28 break; 29 case 3: 30 System.out.print("请输入您需要还多少本书:"); 31 number = in.nextInt(); 32 card.returnBook(number); 33 break; 34 case 4: 35 System.out.println("成功退出 欢迎下次使用"); 36 break exit; 37 } 38 } 39 in.close(); 40 } 41 42 }
1 package com.wsy.work.input; 2 import java.util.Scanner; 3 public class EleChargeManagementInput { 4 Scanner in = new Scanner(System.in); 5 private double readNumberLastMonth; 6 private double readNumberThisMonth; 7 public void input() 8 { 9 System.out.println("请依次输入上月电表读数、本月电表读数"); 10 readNumberLastMonth = in.nextDouble(); 11 readNumberThisMonth = in.nextDouble(); 12 } 13 public double getReadNumberLastMonth() { 14 return readNumberLastMonth; 15 } 16 public void setReadNumberLastMonth(double readNumberLastMonth) { 17 this.readNumberLastMonth = readNumberLastMonth; 18 } 19 public double getReadNumberThisMonth() { 20 return readNumberThisMonth; 21 } 22 public void setReadNumberThisMonth(double readNumberThisMonth) { 23 this.readNumberThisMonth = readNumberThisMonth; 24 } 25 26 }
1 package com.wsy.work.type; 2 /** 3 * 在该类中出现了浮点数进行运算后的的精度问题 4 * 没时间了我暂时用四舍五入来敷衍了一下 5 * 这种问题可以去使用大浮点数来解决 6 * BigDecimal(大浮点数) 7 * @author Administrator 8 * 9 */ 10 public class EleChargeManagement { 11 private double readNumberLastMonth; 12 private double readNumberThisMonth; 13 private double numberThisMonth; 14 15 public EleChargeManagement(double readNumberLastMonth, double readNumberThisMonth) { 16 this.readNumberLastMonth = readNumberLastMonth; 17 this.readNumberThisMonth = readNumberThisMonth; 18 } 19 20 public void show() 21 { 22 System.out.println("上月电表读数为:"+this.readNumberLastMonth); 23 System.out.println("本月电表读数为:"+this.readNumberThisMonth); 24 } 25 public void computeEleConsumption() 26 { 27 numberThisMonth = Math.round(this.readNumberThisMonth - this.readNumberLastMonth); 28 } 29 public void showEleConsumption() 30 { 31 if(numberThisMonth == 0) 32 { 33 System.out.println("请先计算本月用电数再显示本月用电数!"); 34 } 35 else 36 { 37 System.out.println("本月使用电数为:"+numberThisMonth); 38 } 39 } 40 public void showElePrice() 41 { 42 final double unitPrice = 1.2; 43 double price = numberThisMonth * unitPrice ; 44 System.out.println("本月电费为:"+Math.round(price)); 45 } 46 47 public double getReadNumberLastMonth() { 48 return readNumberLastMonth; 49 } 50 51 public void setReadNumberLastMonth(double readNumberLastMonth) { 52 this.readNumberLastMonth = readNumberLastMonth; 53 } 54 55 public double getReadNumberThisMonth() { 56 return readNumberThisMonth; 57 } 58 59 public void setReadNumberThisMonth(double readNumberThisMonth) { 60 this.readNumberThisMonth = readNumberThisMonth; 61 } 62 63 public double getNumberThisMonth() { 64 return numberThisMonth; 65 } 66 67 public void setNumberThisMonth(double numberThisMonth) { 68 this.numberThisMonth = numberThisMonth; 69 } 70 71 }
1 package com.wsy.work.test; 2 import java.util.Scanner; 3 4 import com.wsy.work.input.EleChargeManagementInput; 5 import com.wsy.work.type.EleChargeManagement; 6 public class EleChargeManagementTest { 7 8 public static void main(String[] args) { 9 Scanner in = new Scanner(System.in); 10 EleChargeManagementInput input = new EleChargeManagementInput(); 11 input.input(); 12 EleChargeManagement ele1 = new EleChargeManagement(input.getReadNumberLastMonth(), input.getReadNumberThisMonth()); 13 //显示上月、本月电表读数 14 ele1.show(); 15 //计算本月用电数 16 ele1.computeEleConsumption(); 17 //显示本月用电数 18 ele1.showEleConsumption(); 19 //显示本月电费 20 ele1.showElePrice(); 21 in.close(); 22 } 23 24 }
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