2019年4月24日实训任务＋2019年4月17日实训任务

 1 package com.wsy.type;
 2 
 3 import java.math.BigDecimal;
 4 /**
 5  * 关于为为什么要使用BigDecimal(大浮点数) 这里说明一下，因为在计算机里进行浮点数(double float)计算时可能回产生非常小的误差
 6  * 但是在某一些程序中是不能够有误差的，当然没有为误差的当然是最好的
 7  * 所以我选择的是使用BigDecimal
 8  * 注: BigDecimal需要使用String类型来构造出来，不然也会像double float一样会有精度偏差
 9  * @author wsy
10  *
11  */
12 public class Arithmetic {
13     private BigDecimal number;
14     private BigDecimal number1;
15     private BigDecimal number2;
16     private char sign;
17     public Arithmetic(BigDecimal number1, BigDecimal number2) {
18         this.number1 = number1;
19         this.number2 = number2;
20     }
21     public Arithmetic( BigDecimal number1, BigDecimal number2, char sign) {
22         this.number1 = number1;
23         this.number2 = number2;
24         this.sign = sign;
25         switch(sign)
26         {
27             case'+':
28                 number = this.number1.add(number2);
29                 break;
30             case'-':
31                 number = this.number1.subtract(number2);
32                 break;
33             case'*':
34                 number = this.number1.multiply(number2);
35                 break;
36             case'/':
37                 number = this.number1.divide(number2);
38                 break;
39             default:
40                 System.out.println("input error");
41                 break;
42         }
43         System.out.println("计算后的结果为:"+number);
44     }
45     public BigDecimal add(BigDecimal number1, BigDecimal number2)
46     {
47         return number1.add(number2);
48     }
49     public BigDecimal subtract(BigDecimal number1, BigDecimal number2)
50     {
51         return number1.subtract(number2);
52     }
53     public BigDecimal multiply(BigDecimal number1, BigDecimal number2)
54     {
55         return number1.multiply(number2);
56     }
57     public BigDecimal divide(BigDecimal number1, BigDecimal number2)
58     {
59         return number1.divide(number2);
60     }
61     public BigDecimal getNumber() {
62         return number;
63     }
64     public void setNumber(BigDecimal number) {
65         this.number = number;
66     }
67     public BigDecimal getNumber1() {
68         return number1;
69     }
70     public void setNumber1(BigDecimal number1) {
71         this.number1 = number1;
72     }
73     public BigDecimal getNumber2() {
74         return number2;
75     }
76     public void setNumber2(BigDecimal number2) {
77         this.number2 = number2;
78     }
79     public char getSign() {
80         return sign;
81     }
82     public void setSign(char sign) {
83         this.sign = sign;
84     }
85     
86 
87 }

 1 package com.wsy.test;
 2 
 3 import java.math.BigDecimal;
 4 import java.util.Scanner;
 5 
 6 import com.wsy.type.Arithmetic;
 7 
 8 public class ArithmeticTest {
 9 
10     public static void main(String[] args) {
11         Scanner in = new Scanner(System.in);
12         BigDecimal number1 = new BigDecimal(in.nextLine());
13         BigDecimal number2 = new BigDecimal(in.nextLine());
14         char sign = in.nextLine().charAt(0);
15         Arithmetic a1 = new Arithmetic(number1, number2, sign);
16 
17     }
18 
19 }

 1 package com.wsy.input;
 2 
 3 
 4 import java.math.BigDecimal;
 5 import java.util.Scanner;
 6 
 7 public class CylinderInput {
 8     Scanner in = new Scanner(System.in);
 9     private BigDecimal ridius;
10     private BigDecimal height;
11     public void scanner() 
12     {
13         ridius = new BigDecimal(in.nextLine());
14         height = new BigDecimal(in.nextLine());
15     }
16     public void showPrompt() 
17     {
18         System.out.println("请输入圆柱体的半径和高:");
19     }
20     public BigDecimal getRidius() {
21         return ridius;
22     }
23     public void setRidius(BigDecimal ridius) {
24         this.ridius = ridius;
25     }
26     public BigDecimal getHeight() {
27         return height;
28     }
29     public void setHeight(BigDecimal height) {
30         this.height = height;
31     }
32     
33 }

 1 package com.wsy.method;
 2 
 3 import java.math.BigDecimal;
 4 
 5 public class CylinderCalculation {
 6     public static BigDecimal getBottomArea(BigDecimal p ,BigDecimal ridius)
 7     {
 8         return p.multiply(ridius).multiply(ridius);
 9     }
10     public static BigDecimal getVolume(BigDecimal p , BigDecimal ridius , BigDecimal height)
11     {
12         return p.multiply(ridius).multiply(ridius).multiply(height);
13     }
14 }

 1 package com.wsy.type;
 2 import com.wsy.method.*;
 3 import java.math.BigDecimal;
 4 
 5 public class Cylinder {
 6     private final BigDecimal p = new BigDecimal("3.14");
 7     private BigDecimal ridius;
 8     private BigDecimal height;
 9     public Cylinder(BigDecimal ridius, BigDecimal height) {
10         this.ridius = ridius;
11         this.height = height;
12     }
13     public void print() 
14     {
15         System.out.println("圆底半径:"+ridius);
16         System.out.println("高:"+height);
17         System.out.println("底面积:"+CylinderCalculation.getBottomArea(p , ridius));
18         System.out.println("体积:"+CylinderCalculation.getVolume(p, ridius, height));
19     }
20     public BigDecimal getRidius() {
21         return ridius;
22     }
23     public void setRidius(BigDecimal ridius) {
24         this.ridius = ridius;
25     }
26     public BigDecimal getHeight() {
27         return height;
28     }
29     public void setHeight(BigDecimal height) {
30         this.height = height;
31     }
32     
33 }

 1 package com.wsy.test;
 2 
 3 import com.wsy.input.CylinderInput;
 4 import com.wsy.type.Cylinder;
 5 
 6 public class CylinderTest {
 7 
 8     public static void main(String[] args) {
 9         CylinderInput input = new CylinderInput();
10         input.showPrompt();
11         input.scanner();
12         Cylinder c1 = new Cylinder(input.getRidius() , input.getHeight());
13         c1.print();
14         System.out.println("=======================================================");
15         input.showPrompt();
16         input.scanner();
17         Cylinder c2 = new Cylinder(input.getRidius() , input.getHeight());
18         c2.print();
19     }
20 
21 }

 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.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 }