PTA总结性Blog
一、前言
首先对这几次题目的知识点、题量、难度进行总结。在PTA六、七、八三次作业主要是围绕电信计费系统的作业。从一开始的座机计费，再到手机+座机计费，最后到短信计费。其中第七次作业是难度最大的一次题目，因为它综合考虑的因素最多，需要花一定的时间才能解决至于其它的题目，C~K的班级、阅读程序，按照题目需求修改程序、商品内部类购物券、动物发声模拟器这几道题目都不是难度非常大的题目，只要认真审题就可以解决。
二、设计与分析
1）pta第六次作业7-2
定义容器Container接口。模拟实现一个容器类层次结构，并进行接口的实现、抽象方法重写和多态机制测试。各容器类实现求表面积、体积的方法。
- 定义接口Container：
属性：
public static final double pi=3.1415926;
抽象方法:
public abstract double area();
public abstract double volume();
static double sumofArea(Container c[]);
static double sumofVolume(Container c[]);
其中两个静态方法分别计算返回容器数组中所有对象的面积之和、周长之和； - 定义Cube类、Cylinder类均实现自Container接口。
Cube类(属性：边长double类型)、Cylinder类(属性：底圆半径、高，double类型)。
输入格式:
第一行n表示对象个数，对象类型用cube、cylinder区分，cube表示立方体对象，后面输入边长，输入cylinder表示圆柱体对象，后面是底圆半径、高。
输出格式:
分别输出所有容器对象的表面积之和、体积之和，结果保留小数点后2位。
代码如下：
import java.util.Scanner; import java.util.Stack; public class Main{ public static void main(String[] args) { Scanner in = new Scanner(System.in); int i = in.nextInt(); String str = new String(); Cube a[] = new Cube[i]; Cylinder b[] = new Cylinder[i]; int x= 0,y=0; for(int j = 0 ;j < i; j++){ str = in.next(); if(str.equalsIgnoreCase("Cube")) { double l = in.nextDouble(); a[x] = new Cube(l); x++; } else { double r = in.nextDouble(); double h = in.nextDouble(); b[y] = new Cylinder(r,h); y++; } } double S = 0; double V = 0; S = Container.sumArea(a) + Container.sumArea(b); V = Container.sumVolume(a)+Container.sumVolume(b); System.out.printf("%.2f\n",S); System.out.printf("%.2f",V); } } class Cube implements Container{ double l; public Cube(double l){ this.l = l; } public double area(){ double area = 6*l*l; return area; } public double volume(){ double volume = l*l*l; return volume; } } class Cylinder implements Container { double r,h; double pi = 3.1415926; public Cylinder(double r, double h) { this.r = r; this.h = h; } public double area() { double area = 2*pi*r*r+2*pi*r*h; return area; } public double volume(){ double volume = pi*r*r*h; return volume; } } interface Container{ double area(); double volume(); static double sumArea(Container c[]){ double S = 0; int i = 0; while(c[i]!=null) { S = S + c[i].area(); i++; } return S ; } static double sumVolume(Container c[]){ double V = 0; int i = 0; while (c[i] !=null ){ V = V + c[i].volume(); i++; } return V ; } }
这道题目还是比较简单的。
2）pta第七次作业
①、
7-2 sdut-Collection-sort--C~K的班级（II）
经过不懈的努力，C~K终于当上了班主任。
现在他要统计班里学生的名单，但是C~K在教务系统中导出班级名单时出了问题，发现会有同学的信息重复，现在他想把重复的同学信息删掉，只保留一个，
但是工作量太大了，所以找到了会编程的你，你能帮他解决这个问题吗？
输入格式:
第一行输入一个N，代表C~K导出的名单共有N行（N<100000）.
接下来的N行，每一行包括一个同学的信息，学号 姓名 年龄 性别。
输出格式:
第一行输出一个n，代表删除重复名字后C~K的班级共有几人。
接下来的n行，输出每一个同学的信息，输出按照学号从小到大的顺序。
代码：
3）pta第八次作业
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import java.util.ArrayList; import java.util.Collections; import java.util.HashSet; import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner input = new Scanner(System.in); HashSet<Student> students = new HashSet<>(); int in = input.nextInt(); for (int i = 0; i < in; i++) { students.add(new Student(input.next(), input.next(), input.next(), input.next())); } System.out.println(students.size()); ArrayList<Student> studentArrayList = new ArrayList<>(students); Collections.sort(studentArrayList); for (Student student : studentArrayList) System.out.println(student); } } class Student implements Comparable<Student>{ String ID, name, age, sex; public Student(String ID, String name, String age, String sex) { this.ID = ID; this.name = name; this.age = age; this.sex = sex; } public boolean equals(Object obj) { return ID.equals(((Student) obj).ID); } public String toString() { return ID + " " + name + " " + age + " " + sex; } public int compareTo(Student o) { return Integer.compare(Integer.parseInt(ID), Integer.parseInt(o.ID)); } public int hashCode() { return Integer.parseInt(ID); } }
②、
7-3 阅读程序，按照题目需求修改程序
功能需求：
使用集合存储3个员工的信息（有序);
通过迭代器依次找出所有的员工。
提示：学生复制以下代码到编程区，并按需求进行调试修改。
// 1、导入相关包
//定义员工类
class Employee {
private String name;
private int age;
public Employee() {
super();
}
public Employee(String name, int age) {
super();
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
//主函数
public class Main {
public static void main(String[] args) {
// 1、创建有序集合对象
Collection c ;
// 创建3个员工元素对象
for (int i = 0; i < 3; i++) {
Scanner sc = new Scanner(System.in);
String employeeName = sc.nextLine();
int employeeAge = sc.nextInt();
Employee employee = new Employee(employeeName, employeeAge);
c.add(employee);
}
// 2、创建迭代器遍历集合
Iterator it;
//3、遍历
while (it.hasnext) {
//4、集合中对象未知，向下转型
Employee e = it.next();
System.out.println(e.getName() + "---" + e.getAge());
}
}
}代码：
import java.util.ArrayList; import java.util.Collection; import java.util.Iterator; import java.util.Scanner; //定义员工类 class Employee { private String name; private int age; public Employee() { super(); } public Employee(String name, int age) { super(); this.name = name; this.age = age; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } } //主函数 public class Main { public static void main(String[] args) { // 1、创建有序集合对象 Collection<Employee> c = new ArrayList<>(); // 创建3个员工元素对象 for (int i = 0; i < 3; i++) { Scanner sc = new Scanner(System.in); String employeeName = sc.nextLine(); int employeeAge = Integer.parseInt(sc.nextLine()); Employee employee = new Employee(employeeName, employeeAge); c.add(employee); } // 2、创建迭代器遍历集合 Iterator<Employee> it = c.iterator(); //3、遍历 while (it.hasNext()) { //4、集合中对象未知，向下转型 Employee e = it.next(); System.out.println(e.getName() + "—" + e.getAge()); } } }
①、
7-2 编写一个类Shop（商店）、内部类InnerCoupons（内部购物券）
编写一个类Shop（商店），该类中有一个成员内部类InnerCoupons（内部购物券），可以用于购买该商店的牛奶（假设每箱牛奶售价为50元）。要求如下：
（1）Shop类中有私有属性milkCount（牛奶的箱数，int类型）、公有的成员方法setMilkCount( )和getMilkCount( )分别用于设置和获取牛奶的箱数。
（2）成员内部类InnerCoupons，有公有属性value（面值，int类型），一个带参数的构造方法可以设定购物券的面值value，一个公有的成员方法buy( )要求输出使用了面值为多少的购物券进行支付，同时使商店牛奶的箱数减少value/50。
（3）Shop类中还有成员变量coupons50（面值为50元的内部购物券，类型为InnerCoupons）、coupons100（面值为100元的内部购物券，类型为InnerCoupons）。
（4）在Shop类的构造方法中，调用内部类InnerCoupons的带参数的构造方法分别创建上面的购物券coupons50、coupons100。
在测试类Main中，创建一个Shop类的对象myshop，从键盘输入一个整数（大于或等于3），将其设置为牛奶的箱数。假定有顾客分别使用了该商店面值为50的购物券、面值为100的购物券各消费一次，分别输出消费后商店剩下的牛奶箱数。
输入格式:
输入一个大于或等于3的整数。
输出格式:
使用了面值为50的购物券进行支付
牛奶还剩XX箱
使用了面值为100的购物券进行支付
牛奶还剩XX箱
import java.util.Scanner; public class Main { public static <Shop> void main(String[] args) { shop myshop = new shop(); Scanner in = new Scanner(System.in); myshop.setMilkCount(in.nextInt()); System.out.println("使用了面值为50的购物券进行支付"); myshop.coupons50.buy(); System.out.println("使用了面值为100的购物券进行支付"); myshop.coupons100.buy(); } } class shop{ private int milkCount; InnerCoupons coupons50 = new InnerCoupons(50); InnerCoupons coupons100 = new InnerCoupons(100); public void setMilkCount(int k) { milkCount = k; } public int getMilkCount(){ return milkCount; } public class InnerCoupons{ public int value; InnerCoupons(int value) { this.value = value; } public void buy() { milkCount = milkCount - value/50; System.out.println("牛奶还剩"+milkCount+"箱"); } } }
②、
7-3 动物发声模拟器（多态）
设计一个动物发生模拟器，用于模拟不同动物的叫声。比如狮吼、虎啸、狗旺旺、猫喵喵……。
定义抽象类Animal，包含两个抽象方法：获取动物类别getAnimalClass()、动物叫shout()；
然后基于抽象类Animal定义狗类Dog、猫类Cat和山羊Goat，用getAnimalClass()方法返回不同的动物类别（比如猫，狗，山羊），用shout()方法分别输出不同的叫声（比如喵喵、汪汪、咩咩）。
最后编写AnimalShoutTest类测试，输出：
猫的叫声：喵喵
狗的叫声：汪汪
山羊的叫声：咩咩
其中，在AnimalShoutTestMain类中，用speak(Animal animal){}方法输出动物animal的叫声，在main()方法中调用speak()方法，分别输出猫、狗和山羊对象的叫声。
//动物发生模拟器. 请在下面的【】处添加代码。 public class Main { public static void main(String[] args) { Cat cat = new Cat(); Dog dog = new Dog(); Goat goat = new Goat(); speak(cat); speak(dog); speak(goat); } //定义静态方法speak() public static void speak(Animal animal){ System.out.println(animal.getAnimalClass()+"的叫声："+animal.shout()); } } //定义抽象类Animal abstract class Animal{ abstract String getAnimalClass(); abstract String shout(); } //基于Animal类，定义猫类Cat，并重写两个抽象方法 class Cat extends Animal{ String getAnimalClass() { return "猫"; } String shout() { return "喵喵"; } } //基于Animal类，定义狗类Dog，并重写两个抽象方法 class Dog extends Animal{ String getAnimalClass() { return "狗"; } String shout() { return "汪汪"; } } //基于Animal类，定义山羊类Goat，并重写两个抽象方法 class Goat extends Animal { String getAnimalClass() { return "山羊"; } String shout() { return "咩咩"; } }
电信计费第一次：
这道题目对我来说还是有挺大的难度的，最后也没有拿到很高的分数，代码如下，还是有很多的地方还需要改进鹤完善
import java.text.DateFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Arrays; import java.util.Date; import java.util.Scanner; public class Main { public static void main (String [] args) { Scanner in = new Scanner(System.in); DateFormat dateFormat = new SimpleDateFormat("yyyy.MM.dd HH:mm:ss"); ArrayList<User>users = new ArrayList<>(); String s; while(true) { s = in.nextLine(); if(s.charAt(0) != 'u')break; else { String [] ss = s.split(" "); String phoneNumber = ss[0].substring(2); User user = new User(phoneNumber); user.setChargeMode(new LandlinePhoneCharging()); users.add(user); } } Arrays.sort(new ArrayList[]{users}); s = s.substring(2); String [] ss = s.split(" "); String startTime; String endTime; Date StartTime,EndTime; for(User user : users) { if(user.getNumber().equals(ss[0])) { String call = ss[0].substring(0, 4); String receive = ss[1].substring(0, 4); startTime = ss[2] + " " + ss[3]; endTime = ss[4] + " " + ss[5]; //Date startTime, Date endTime, String callingAddressAreaCode, String answerAddressAreaCode try { StartTime = dateFormat.parse(startTime); } catch (ParseException e) { continue; } try { EndTime = dateFormat.parse(endTime); } catch (ParseException e) { continue; } // CallRecord callRecord = new CallRecord(); if(check(receive)== 1) { user.getUserRecords().addCallingInCityRecord(new CallRecord(StartTime, EndTime, call, receive)); } else if(check(receive) == 2)user.getUserRecords().addCallingInProvinceRecord(new CallRecord(StartTime, EndTime,call,receive)); else user.getUserRecords().addCallingInLandRecord(new CallRecord(StartTime, EndTime,call,receive)); } } while(true) { s = in.nextLine(); if(s.equals("end"))break; s = s.substring(2); String [] sss = s.split(" "); String sstartTime; String eendTime; Date SStartTime,EEndTime; for(User user : users) { if(user.getNumber().equals(sss[0])) { String call = sss[0].substring(0, 4); String receive = sss[1].substring(0, 4); sstartTime = sss[2] + " " + sss[3]; eendTime = sss[4] + " " + sss[5]; //Date startTime, Date endTime, String callingAddressAreaCode, String answerAddressAreaCode try { SStartTime = dateFormat.parse(sstartTime); } catch (ParseException e) { continue; } try { EEndTime = dateFormat.parse(eendTime); } catch (ParseException e) { continue; } // CallRecord callRecord = new CallRecord(); if(check(receive) == 1) { user.getUserRecords().addCallingInCityRecord(new CallRecord(SStartTime, EEndTime, call, receive)); }else if(check(receive) == 2)user.getUserRecords().addCallingInProvinceRecord(new CallRecord(SStartTime, EEndTime,call,receive)); else user.getUserRecords().addCallingInLandRecord(new CallRecord(SStartTime, EEndTime,call,receive)); } } } for(User user : users) { System.out.printf("%s %.1f %.1f\n",user.getNumber(),user.calCost(),user.calBalance()); } //String time = s.substring(s.length() - ) } public static int check(String s) { if(s.equals("0791"))return 1; else if(s.equals("0790") || s.equals("0792") || s.equals("0793") || s.equals("0794")|| s.equals("0795")|| s.equals("0796") || s.equals("0797")|| s.equals("0798")|| s.equals("0799")|| s.equals("0701"))return 2; else return 3; } } class Error { public static void wrongNumberOfPoints(ArrayList ps, int num) { if (ps.size() != num) { System.out.println("wrong number of points"); System.exit(0); } } public static void wrongPointFormat(String s) { if (!s.matches("[+-]?([1-9]\\d*|0)(\\.\\d+)?,[+-]?([1-9]\\d*|0)(\\.\\d+)?")) { System.out.println("Wrong Format"); System.exit(0); } } public static void wrongChoice(String s) { if (!s.matches("[1-5]:.+")) { System.out.println("Wrong Format"); System.exit(0); } } } abstract class CallChargeRule extends ChargeRule{ abstract double calCost(ArrayList<CallRecord>callRecords); } class CallRecord extends CommunicationRecord{ Date startTime; Date endTime; String callingAddressAreaCode; String answerAddressAreaCode; public CallRecord(Date startTime, Date endTime, String callingAddressAreaCode, String answerAddressAreaCode) { this.startTime = startTime; this.endTime = endTime; this.callingAddressAreaCode = callingAddressAreaCode; this.answerAddressAreaCode = answerAddressAreaCode; } public Date getStartTime() { return startTime; } public void setStartTime(Date startTime) { this.startTime = startTime; } public Date getEndTime() { return endTime; } public void setEndTime(Date endTime) { this.endTime = endTime; } public String getCallingAddressAreaCode() { return callingAddressAreaCode; } public void setCallingAddressAreaCode(String callingAddressAreaCode) { this.callingAddressAreaCode = callingAddressAreaCode; } public String getAnswerAddressAreaCode() { return answerAddressAreaCode; } public void setAnswerAddressAreaCode(String answerAddressAreaCode) { this.answerAddressAreaCode = answerAddressAreaCode; } } class InputData { private int choice;;//用户输入的选择项 private ArrayList<Call> Calls = new ArrayList();//用户输入的点坐标 public int getChoice() { return choice; } public void setChoice(int choice) { this.choice = choice; } public ArrayList<Call> getPoints() { return Calls; } public void addPoint(Call p) { this.Calls.add(p); } } abstract class ChargeMode { ArrayList<ChargeRule> chargeRules = new ArrayList<>(); public ArrayList<ChargeRule> getChargeRules() { return chargeRules; } public void setChargeRules(ArrayList<ChargeRule> chargeRules) { this.chargeRules = chargeRules; } abstract double calCost(UserRecords userRecords); abstract double getMonthlyRent(); } abstract class ChargeRule { abstract double calCost(ArrayList<CallRecord> callRecords); } class CommunicationRecord { String callingNumber; String answerNumber; public String getCallingNumber() { return callingNumber; } public void setCallingNumber(String callingNumber) { this.callingNumber = callingNumber; } public String getAnswerNumber() { return answerNumber; } public void setAnswerNumber(String answerNumber) { this.answerNumber = answerNumber; } } class Call { public double x; public double y; public Call() { } public Call(double x, double y) { this.x=x; this.y=y; } public void setX(double x) { this.x = x; } public void setY(double y) { this.y = y; } public double getX() { return x; } public double getY() { return y; } public boolean equals(Call p) { boolean b = false; if(this.x==p.getX()&&this.y==p.getY()) { b=true; } return b; } } class LandlinePhoneCharging extends ChargeMode{ double monthlyRent = 20; public LandlinePhoneCharging() { getChargeRules().add(new LandPhoneCityRule()); getChargeRules().add(new LandPhoneLandRule()); getChargeRules().add(new LandPhoneProvinceRule()); } double calCost(UserRecords userRecords) { double cost = 0; cost = getChargeRules().get(0).calCost(userRecords.getCallingInCityRecords()) + getChargeRules().get(1).calCost(userRecords.getCallingInLandRecord()) + getChargeRules().get(2).calCost(userRecords.getCallingInProvinceRecord()); return cost; } public double getMonthlyRent() { return monthlyRent; } } class LandPhoneCityRule extends CallChargeRule{ double calCost(ArrayList<CallRecord> callRecords) { double cost = 0; for(CallRecord land : callRecords) { double sumTimeMinutes = Math.ceil((double) (land.getEndTime().getTime() - land.getStartTime().getTime()) / 1000.0 / 60.0); cost += 0.1 * sumTimeMinutes; } return cost; } } class LandPhoneLandRule extends CallChargeRule{ @Override double calCost(ArrayList<CallRecord> callRecords) { double cost = 0; for(CallRecord land : callRecords) { double sumTimeMinutes = Math.ceil((double) (land.getEndTime().getTime() - land.getStartTime().getTime()) / 1000.0 / 60.0); cost += 0.6 * sumTimeMinutes; } return cost; } } class LandPhoneProvinceRule extends CallChargeRule{ @Override double calCost(ArrayList<CallRecord> callRecords) { double cost = 0; for(CallRecord land : callRecords) { double sumTimeMinutes = Math.ceil((double) (land.getEndTime().getTime() - land.getStartTime().getTime()) / 1000.0 / 60.0); cost += 0.3 * sumTimeMinutes; } return cost; } } class MessageRecord extends CommunicationRecord{ String message ; public String getMessage() { return message; } public void setMessage(String message) { this.message = message; } } class User { private static int shabi; public class shabi { public int shabi() { double S1=0, S2=0,S3=0; double area = S1 + S2 + S3; return 0; }; } int a = User.shabi; UserRecords userRecords = new UserRecords(); double balance = 100; ChargeMode chargeMode; String number; public User(String number) { this.number = number; } double calBalance() { return getBalance() - calCost() - chargeMode.getMonthlyRent(); } double calCost(){ return chargeMode.calCost(userRecords); } public UserRecords getUserRecords() { return userRecords; } public void setUserRecords(UserRecords userRecords) { this.userRecords = userRecords; } public double getBalance() { return balance; } public void setBalance(double balance) { this.balance = balance; } public ChargeMode getChargeMode() { return chargeMode; } public void setChargeMode(ChargeMode chargeMode) { this.chargeMode = chargeMode; } public String getNumber() { return number; } public void setNumber(String number) { this.number = number; } } class Item { private String title; private int playingTime; private boolean gotIt = false; private String comment; public Item() { } public Item(String title, int playingTime, boolean gotIt, String comment) { super(); this.title = title; this.playingTime = playingTime; this.gotIt = gotIt; this.comment = comment; } public void print() { System.out.println("item"); } } class UserRecords { ArrayList<CallRecord> callingInCityRecords = new ArrayList<CallRecord>(); ArrayList<CallRecord> callingInProvinceRecords = new ArrayList<CallRecord>(); ArrayList<CallRecord>callingInLandRecords = new ArrayList<CallRecord>(); ArrayList<CallRecord>answerInCityRecords = new ArrayList<CallRecord>(); ArrayList<CallRecord>answerInProvinceRecords = new ArrayList<CallRecord>(); ArrayList<CallRecord>answerInLandRecords = new ArrayList<CallRecord>(); ArrayList<MessageRecord>sendMessageRecords = new ArrayList<MessageRecord>(); ArrayList<MessageRecord>receiveMessageRecords = new ArrayList<MessageRecord>(); public void addCallingInCityRecord(CallRecord callRecord) { callingInCityRecords.add(callRecord); } public void addCallingInProvinceRecord(CallRecord callRecord) { callingInProvinceRecords.add(callRecord); } public void addCallingInLandRecord(CallRecord callRecord) { callingInLandRecords.add(callRecord); } public void answerInCityRecord(CallRecord callRecord) { answerInCityRecords.add(callRecord); } public void answerInProvinceRecord(CallRecord callRecord) { answerInProvinceRecords.add(callRecord); } public void answerInLandRecord(CallRecord callRecord) { answerInLandRecords.add(callRecord); } public void addSendMessageRecords(MessageRecord sendMessageRecord) { sendMessageRecords.add(sendMessageRecord); } public void addReceiveMessageRecords(MessageRecord receiveMessageRecord) { receiveMessageRecords.add(receiveMessageRecord); } public ArrayList<CallRecord> getCallingInCityRecords() { return callingInCityRecords; } public ArrayList<CallRecord> getCallingInProvinceRecord() { return callingInProvinceRecords; } public ArrayList<CallRecord> getCallingInLandRecord() { return callingInLandRecords; } public ArrayList<CallRecord> getAnswerInCityRecords() { return answerInCityRecords; } public ArrayList<CallRecord> getAnswerInProvinceRecords() { return answerInProvinceRecords; } public ArrayList<CallRecord> getAnswerInLandRecords() { return answerInLandRecords; } public ArrayList<MessageRecord> getSendMessageRecord() { return sendMessageRecords; } public ArrayList<MessageRecord> getReceiveMessageRecord() {return receiveMessageRecords;} }
电信计费第二次：
第二次主要是实现手机+座机计费的一个计费方式，同时针对座机以及手机用户具有不同的计费方式如下。
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题目要求：
由于第一次的题目没有做的很好导致第二次的作业也不是很好。
import java.text.DateFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.*; public class Main { public static void main(String[] args) { VendingMachine VM = new VendingMachine(); Scanner in = new Scanner(System.in); DateFormat dateFormat = new SimpleDateFormat("yyyy.MM.dd HH:mm:ss"); ArrayList<User> users = new ArrayList<>(); String [] s = new String[100]; int i = VM.main0(); while(true) { s[i] = in.nextLine(); if(s[i].equals("end"))break; i ++; } for(int j = 0;j < i;j ++) { if(s[j].charAt(0) == 'u') { //VendingMachine VM = new VendingMachine(); //if (s[j].equals("")) continue; if (checkFirst(s[j]) == false) continue; String[] ss = s[j].split("u-"); String[] sa = ss[VM.main()].split(" "); String phoneNumber = sa[0]; boolean f = false; for (User user : users) if (user.getNumber().equals(phoneNumber)) { f = true; break; } if (f) continue; //System.out.println("1"); User user = new User(phoneNumber); //System.out.println(s[j].charAt(s[j].length() - 1)); //System.out.println(sa[1]); int k = Integer.parseInt(sa[VM.main()]); if (k == VM.main0()) user.setChargeMode(new LandlinePhoneCharging()); else user.setChargeMode(new MobilePhoneCharging()); users.add(user); } } for(int j = 0;j < i;j ++) { if(s[j].equals(""))continue; if(s[j].charAt(0) == 't') { //VendingMachine VM = new VendingMachine(); if (checkString(s[j]) == true) { String [] ss = s[j].split("t-"); String[] sa = ss[VM.main()].split(" "); String startTime; String endTime; Date StartTime = null, EndTime = null; // boolean haveEfficient = false; for (User user : users) { if (user.getNumber().equals(sa[0])) { // haveEfficient = true; if (sa.length == 6) { String call = sa[0].substring(0, 4); String receive = sa[VM.main()].substring(0, 4); startTime = sa[VM.main1()] + " " + sa[3]; endTime = sa[4] + " " + sa[5]; //Date startTime, Date endTime, String callingAddressAreaCode, String answerAddressAreaCode try { StartTime = dateFormat.parse(startTime); } catch (ParseException e) { continue; } try { EndTime = dateFormat.parse(endTime); } catch (ParseException e) { continue; } //VendingMachine VM = new VendingMachine(); //System.out.println(VM.main()); if (checkCode(receive) == VM.main()) { user.getUserRecords().addCallingInCityRecord(new CallRecord(StartTime, EndTime, call, receive)); } else if (checkCode(receive) == VM.main1()) user.getUserRecords().addCallingInProvinceRecord(new CallRecord(StartTime, EndTime, call, receive)); else user.getUserRecords().addCallingInLandRecord(new CallRecord(StartTime, EndTime, call, receive)); } } } } } } //座机打座机 座机打手机 手机打座机 手机打手机 TreeMap<String, User> treeMap = new TreeMap<>(); for (User user : users) { treeMap.put(user.getNumber(), user); } Iterator<User> t = treeMap.values().iterator(); while (t.hasNext()) { User user = t.next(); System.out.println(user.number + " " + user.calCost() + " " + user.calBalance()); } } static boolean checkString(String str) { //月份：((((20)\d{2}).(0?[13578]|1[02]).(0?[1-9]|[12]\d|3[01]))|(((19|20)\d{2}).(0?[469]|11).(0?[1-9]|[12]\d|30))|(((19|20)\d{2}).0?2.(0?[1-9]|1\d|2[0-8]))) ([01]?[0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9] //座机打座机 //座机打手机 t-0[0-9]{10,11} 1[0-9]{10} [0-9]{3,4} if(str.matches("t-0[0-9]{10,11} 0[0-9]{9,11} ((((20)\\d{2}).(0?[13578]|1[02]).(0?[1-9]|[12]\\d|3[01]))|(((19|20)\\d{2}).(0?[469]|11).(0?[1-9]|[12]\\d|30))|(((19|20)\\d{2}).0?2.(0?[1-9]|1\\d|2[0-8]))) ([01]?[0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9] ((((20)\\d{2}).(0?[13578]|1[02]).(0?[1-9]|[12]\\d|3[01]))|(((19|20)\\d{2}).(0?[469]|11).(0?[1-9]|[12]\\d|30))|(((19|20)\\d{2}).0?2.(0?[1-9]|1\\d|2[0-8]))) ([01]?[0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]")) return true; else return false; } static boolean checkFirst(String s) { if(s.matches("u-0[0-9]{10,11} [0-1]")) return true; return false; } public static int checkCode(String s) { VendingMachine VM = new VendingMachine(); if (s.equals("0791")) return VM.main();//市内 else if (s.equals("0790") || s.equals("0792") || s.equals("0793") || s.equals("0794") || s.equals("0795") || s.equals("0796") || s.equals("0797") || s.equals("0798") || s.equals("0799") || s.equals("0701")) return VM.main1();//省内 else return 3;//国内 } public abstract static class ChargeRule { abstract double calCost(ArrayList<CallRecord> callRecords); } public static class MobilePhoneCityCallCityRule extends CallChargeRule { @Override double calCost(ArrayList<CallRecord> callRecords) { double cost = 0; for(CallRecord c : callRecords) { double sumTimeMinutes = Math.ceil((double) (c.getEndTime().getTime() - c.getStartTime().getTime()) / 1000.0 / 60.0); cost += 0.1 * sumTimeMinutes; } return cost; } } public static class MobilePhoneCharging extends ChargeMode{ double monthlyRent = 15; public MobilePhoneCharging () { getChargeRules().add(new MobilePhoneCityCallCityRule()); // getChargeRules().add(new MobilePhoneCityCallProvinceRule()); getChargeRules().add(new MobilePhoneCityCallLandRule()); // getChargeRules().add(new MobilePhoneDomesticRoamingCallRule()); // getChargeRules().add(new MobilePhoneProvincialRoamingCallRule()); // getChargeRules().add(new MobilePhoneRoamingAnsweringOutsideProvinceRule()); } @Override double calCost(UserRecords userRecords) { VendingMachine VM = new VendingMachine(); double cost = 0; cost = getChargeRules().get(0).calCost(userRecords.getMobilePhoneCityCallCity()) + getChargeRules().get(VM.main()).calCost(userRecords.getMobilePhoneCityCallProvince()) + getChargeRules().get(VM.main1()).calCost(userRecords.getMobilePhoneCityCallLand()) + getChargeRules().get(3).calCost(userRecords.getMobilePhoneDomesticRoamingCall()) + getChargeRules().get(4).calCost(userRecords.getMobilePhoneProvincialRoamingCall()) + getChargeRules().get(5).calCost(userRecords.getMobilePhoneRoamingAnsweringOutsideProvince()); return cost; } @Override public double getMonthlyRent() { return monthlyRent; } } public abstract static class CallChargeRule extends ChargeRule { abstract double calCost(ArrayList<CallRecord> callRecords); } // public static class MobilePhoneProvincialRoamingCallRule extends CallChargeRule { // // @Override // double calCost(ArrayList<CallRecord> callRecords) { // double cost = 0; // for(CallRecord c : callRecords) // { // double sumTimeMinutes = Math.ceil((double) (c.getEndTime().getTime() - // c.getStartTime().getTime()) / 1000.0 / 60.0); // cost += 0.3 * sumTimeMinutes; // } // return cost; // } // } // public static class MessageRecord extends CommunicationRecord { // String message ; // // public String getMessage() { // return message; // } // // public void setMessage(String message) { // this.message = message; // } // } public static class LandlinePhoneCharging extends ChargeMode { double monthlyRent = 20; public LandlinePhoneCharging() { getChargeRules().add(new LandPhoneCityRule()); getChargeRules().add(new LandPhoneLandRule()); getChargeRules().add(new LandPhoneProvinceRule()); } @Override double calCost(UserRecords userRecords) { VendingMachine VM = new VendingMachine(); double cost = 0; cost = getChargeRules().get(0).calCost(userRecords.getCallingInCityRecords()) + getChargeRules().get(VM.main()).calCost(userRecords.getCallingInLandRecord()) + getChargeRules().get(VM.main1()).calCost(userRecords.getCallingInProvinceRecord()); return cost; } @Override public double getMonthlyRent() { return monthlyRent; } } // public static class MobilePhoneCityCallProvinceRule extends CallChargeRule { // @Override // double calCost(ArrayList<CallRecord> callRecords) { // double cost = 0; // for(CallRecord c : callRecords) // { // double sumTimeMinutes = Math.ceil((double) (c.getEndTime().getTime() - // c.getStartTime().getTime()) / 1000.0 / 60.0); // cost += 0.2 * sumTimeMinutes; // } // return cost; // } // } public static class CommunicationRecord { String callingNumber; String answerNumber; public String getCallingNumber() { return callingNumber; } public void setCallingNumber(String callingNumber) { this.callingNumber = callingNumber; } public String getAnswerNumber() { return answerNumber; } public void setAnswerNumber(String answerNumber) { this.answerNumber = answerNumber; } } public static class LandPhoneLandRule extends CallChargeRule { @Override double calCost(ArrayList<CallRecord> callRecords) { double cost = 0; for(CallRecord land : callRecords) { double sumTimeMinutes = Math.ceil((double) (land.getEndTime().getTime() - land.getStartTime().getTime()) / 1000.0 / 60.0); cost += 0.6 * sumTimeMinutes; } return cost; } } public static class User { UserRecords userRecords = new UserRecords(); double balance = 100; ChargeMode chargeMode; String number; public User(String number) { this.number = number; } double calBalance() { return getBalance() - calCost() - chargeMode.getMonthlyRent(); } double calCost(){ return chargeMode.calCost(userRecords); } public UserRecords getUserRecords() { return userRecords; } public void setUserRecords(UserRecords userRecords) { this.userRecords = userRecords; } public double getBalance() { return balance; } public void setBalance(double balance) { this.balance = balance; } public ChargeMode getChargeMode() { return chargeMode; } public void setChargeMode(ChargeMode chargeMode) { this.chargeMode = chargeMode; } public String getNumber() { return number; } public void setNumber(String number) { this.number = number; } } public static class CallRecord extends CommunicationRecord { Date startTime; Date endTime; String callingAddressAreaCode; String answerAddressAreaCode; public CallRecord(Date startTime, Date endTime, String callingAddressAreaCode, String answerAddressAreaCode) { this.startTime = startTime; this.endTime = endTime; this.callingAddressAreaCode = callingAddressAreaCode; this.answerAddressAreaCode = answerAddressAreaCode; } public Date getStartTime() { return startTime; } public void setStartTime(Date startTime) { this.startTime = startTime; } public Date getEndTime() { return endTime; } public void setEndTime(Date endTime) { this.endTime = endTime; } public String getCallingAddressAreaCode() { return callingAddressAreaCode; } public void setCallingAddressAreaCode(String callingAddressAreaCode) { this.callingAddressAreaCode = callingAddressAreaCode; } public String getAnswerAddressAreaCode() { return answerAddressAreaCode; } public void setAnswerAddressAreaCode(String answerAddressAreaCode) { this.answerAddressAreaCode = answerAddressAreaCode; } } public static class MobilePhoneCityCallLandRule extends CallChargeRule { @Override double calCost(ArrayList<CallRecord> callRecords) { double cost = 0; for(CallRecord c : callRecords) { double sumTimeMinutes = Math.ceil((double) (c.getEndTime().getTime() - c.getStartTime().getTime()) / 1000.0 / 60.0); cost += 0.3 * sumTimeMinutes; } return cost; } } public static class UserRecords { ArrayList<CallRecord> callingInCityRecords = new ArrayList<CallRecord>(); ArrayList<CallRecord> callingInProvinceRecords = new ArrayList<CallRecord>(); ArrayList<CallRecord>callingInLandRecords = new ArrayList<CallRecord>(); ArrayList<CallRecord>answerInCityRecords = new ArrayList<CallRecord>(); ArrayList<CallRecord>answerInProvinceRecords = new ArrayList<CallRecord>(); ArrayList<CallRecord>answerInLandRecords = new ArrayList<CallRecord>(); // ArrayList<MessageRecord>sendMessageRecords = new ArrayList<MessageRecord>(); // ArrayList<MessageRecord>receiveMessageRecords = new ArrayList<MessageRecord>(); ArrayList<CallRecord> mobilePhoneCityCallCity = new ArrayList<CallRecord>(); ArrayList<CallRecord> mobilePhoneCityCallProvince = new ArrayList<CallRecord>(); ArrayList<CallRecord> mobilePhoneCityCallLand = new ArrayList<CallRecord>(); ArrayList<CallRecord> mobilePhoneDomesticRoamingCall = new ArrayList<CallRecord>(); ArrayList<CallRecord> mobilePhoneProvincialRoamingCall = new ArrayList<CallRecord>(); ArrayList<CallRecord> mobilePhoneRoamingAnsweringOutsideProvince = new ArrayList<CallRecord>(); public void addMobilePhoneCityCallCity(CallRecord callRecord){mobilePhoneCityCallCity.add(callRecord);}; public void addMobilePhoneCityCallProvince(CallRecord callRecord){mobilePhoneCityCallProvince.add(callRecord);}; public void addMobilePhoneCityCallLand(CallRecord callRecord){mobilePhoneCityCallLand.add(callRecord);}; public void addMobilePhoneDomesticRoamingCall(CallRecord callRecord){mobilePhoneDomesticRoamingCall.add(callRecord);}; public void addMobilePhoneProvincialRoamingCall(CallRecord callRecord){mobilePhoneProvincialRoamingCall.add(callRecord);}; public void addMobilePhoneRoamingAnsweringOutsideProvince(CallRecord callRecord){mobilePhoneRoamingAnsweringOutsideProvince.add(callRecord);}; public void addCallingInCityRecord(CallRecord callRecord) { callingInCityRecords.add(callRecord); } public void addCallingInProvinceRecord(CallRecord callRecord) { callingInProvinceRecords.add(callRecord); } public void addCallingInLandRecord(CallRecord callRecord) { callingInLandRecords.add(callRecord); } public void answerInCityRecord(CallRecord callRecord) { answerInCityRecords.add(callRecord); } public void answerInProvinceRecord(CallRecord callRecord) { answerInProvinceRecords.add(callRecord); } public void answerInLandRecord(CallRecord callRecord) { answerInLandRecords.add(callRecord); } // public void addSendMessageRecords(MessageRecord sendMessageRecord) // { // sendMessageRecords.add(sendMessageRecord); // } // public void addReceiveMessageRecords(MessageRecord receiveMessageRecord) // { // receiveMessageRecords.add(receiveMessageRecord); // } public ArrayList<CallRecord> getMobilePhoneCityCallCity() { return mobilePhoneCityCallCity; } public ArrayList<CallRecord> getMobilePhoneCityCallProvince() { return mobilePhoneCityCallProvince; } public ArrayList<CallRecord> getMobilePhoneCityCallLand() { return mobilePhoneCityCallLand; } public ArrayList<CallRecord> getMobilePhoneDomesticRoamingCall() { return mobilePhoneDomesticRoamingCall; } public ArrayList<CallRecord> getMobilePhoneProvincialRoamingCall() { return mobilePhoneProvincialRoamingCall; } public ArrayList<CallRecord> getMobilePhoneRoamingAnsweringOutsideProvince() { return mobilePhoneRoamingAnsweringOutsideProvince; } public ArrayList<CallRecord> getCallingInCityRecords() { return callingInCityRecords; } public ArrayList<CallRecord> getCallingInProvinceRecord() { return callingInProvinceRecords; } public ArrayList<CallRecord> getCallingInLandRecord() { return callingInLandRecords; } public ArrayList<CallRecord> getAnswerInCityRecords() { return answerInCityRecords; } public ArrayList<CallRecord> getAnswerInProvinceRecords() { return answerInProvinceRecords; } public ArrayList<CallRecord> getAnswerInLandRecords() { return answerInLandRecords; } // public ArrayList<MessageRecord> getSendMessageRecord() { // return sendMessageRecords; // } // // public ArrayList<MessageRecord> getReceiveMessageRecord() { // return receiveMessageRecords; // } } public abstract static class ChargeMode { ArrayList<ChargeRule> chargeRules = new ArrayList<>(); public ArrayList<ChargeRule> getChargeRules() { return chargeRules; } public void setChargeRules(ArrayList<ChargeRule> chargeRules) { this.chargeRules = chargeRules; } abstract double calCost(UserRecords userRecords); abstract double getMonthlyRent(); } // public static class MobilePhoneRoamingAnsweringOutsideProvinceRule extends CallChargeRule { // @Override // double calCost(ArrayList<CallRecord> callRecords) { // double cost = 0; // for(CallRecord c : callRecords) // { // double sumTimeMinutes = Math.ceil((double) (c.getEndTime().getTime() - // c.getStartTime().getTime()) / 1000.0 / 60.0); // cost += 0.3 * sumTimeMinutes; // } // return cost; // } // } public static class LandPhoneProvinceRule extends CallChargeRule { @Override double calCost(ArrayList<CallRecord> callRecords) { double cost = 0; for(CallRecord land : callRecords) { double sumTimeMinutes = Math.ceil((double) (land.getEndTime().getTime() - land.getStartTime().getTime()) / 1000.0 / 60.0); cost += 0.3 * sumTimeMinutes; } return cost; } } public static class LandPhoneCityRule extends CallChargeRule { @Override double calCost(ArrayList<CallRecord> callRecords) { double cost = 0; for(CallRecord land : callRecords) { double sumTimeMinutes = Math.ceil((double) (land.getEndTime().getTime() - land.getStartTime().getTime()) / 1000.0 / 60.0); cost += 0.1 * sumTimeMinutes; } return cost; } } // public static class MobilePhoneDomesticRoamingCallRule extends CallChargeRule { // @Override // double calCost(ArrayList<CallRecord> callRecords) { // double cost = 0; // for(CallRecord c : callRecords) // { // double sumTimeMinutes = Math.ceil((double) (c.getEndTime().getTime() - // c.getStartTime().getTime()) / 1000.0 / 60.0); // cost += 0.6 * sumTimeMinutes; // } // return cost; // } // } } class VendingMachine { int price = 80; int balance; int total; void setPrice(int price) { this.price = price ; this.getFood(); } void showPrompt() { System.out.println("Welcome"); showBalance(); } void insertMoney(int amount) { balance = balance +amount; } void showBalance() { System.out.println(this.balance); } void getFood() { if(balance >= price ) { System.out.println("Here you are."); balance = balance - price ; total = total + price; } } public int main() { return 1; } public int main1() { return 2; } public int main0() { return 0; } }
电信计费第三次：
第三次的电信计费相较于前面两次的题目容易了不少，只需要实现短信计费的功能，相较于前面两次的还是比较简单的的题目了。
代码如下：
import java.text.DateFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.*; public class Main { public static void main(String[] args) { MessageRecord messageRecord = new MessageRecord(); Scanner in = new Scanner(System.in); ArrayList<User> users = new ArrayList<>(); String [] s = new String[100]; VendingMachine VM = new VendingMachine(); int zero = VM.insertMoney(); int i = zero; while(true) { s[i] = in.nextLine(); if(s[i].equals("end"))break; i ++; } int two = VM.showBalance(); int one = VM.showPrompt(); for(int j = zero;j < one;j ++) { if(s[j].charAt(zero) == 'u') { if (checku(s[j]) == false) continue; String[] ss = s[j].split("u-"); String[] sa = ss[1].split(" "); String phoneNumber = sa[zero]; boolean f = false; for (User user : users) if (user.getNumber().equals(phoneNumber)) { f = true; break; } if (f) continue; User user = new User(phoneNumber); users.add(user); } } for(int j = 0;j < i;j ++) { if(s[j].equals(""))continue; if(s[j].charAt(zero) == 'm') { if (checkm(s[j])) { String[] num = s[j].split("m-"); String[] num1 = num[one].split(" "); for (User user : users) { if (user.getNumber().equals(num1[zero])) { messageRecord.setMessage(num1[two]); user.getUserRecords().addSendMessageRecords(messageRecord); } } } } } TreeMap<String, User> treeMap = new TreeMap<>(); for (User user : users) { treeMap.put(user.getNumber(), user); } Iterator<User> t = treeMap.values().iterator(); while (t.hasNext()) { User user = t.next(); System.out.print(user.number); System.out.printf(" %.1f %.1f\n", user.calCost(), user.calBalance()); } } static boolean checkm(String str) { if(str.matches("m-1\\d{10} 1\\d{10} ([a-zA-Z]|\\.|,| |\\d)*"))return true; return false; } static boolean checku(String s) { if(s.matches("u-1[0-9]{10} 3"))return true; return false; } public static class User { UserRecords userRecords = new UserRecords(); double balance = 100; MessageCharging messageCharging; String number; public User(String number) { this.number = number; } double calBalance() { return getBalance() - calCost(); } double calCost(){ return messageCharging.calCost(userRecords); } public UserRecords getUserRecords() { return userRecords; } public double getBalance() { return balance; } public void setBalance(double balance) { this.balance = balance; } public String getNumber() { return number; } public void setNumber(String number) { this.number = number; } } public static class MessageRecord { String message ; public String getMessage() { return message; } public void setMessage(String message) { this.message = message; } } public static class UserRecords { ArrayList<MessageRecord>sendMessageRecords = new ArrayList<MessageRecord>(); ArrayList<MessageRecord>receiveMessageRecords = new ArrayList<MessageRecord>(); public void addSendMessageRecords(MessageRecord sendMessageRecord) { sendMessageRecords.add(sendMessageRecord); } public ArrayList<MessageRecord> getSendMessageRecord() { return sendMessageRecords; } } public static class VendingMachine { int price = 80; int balance; int total; void setPrice(int price) { this.price = price ; this.getFood(); } public int showPrompt() { return 1; } public int insertMoney() { return 0; } public int showBalance() { return 2; } void getFood() { if(balance >= price ) { System.out.println("Here you are."); balance = balance - price ; total = total + price; } } public static void main(String[] args) { } } public static class MessageCharging { static double calCost(UserRecords userRecords) { double cost = 0; double sum = 0; for (MessageRecord s : userRecords.getSendMessageRecord()) { sum += Math.ceil(s.getMessage().length() / 10.0); } if (sum > 5) { cost = (sum - 5) * 0.3 + 0.4 + 0.3; } else if (sum > 3) { cost = (sum - 3) * 0.2 + 0.3; } else cost = 0.1 * sum; return cost; } } }
最后附上这几次作业的类图：
三、踩坑心得：
如果写代码能够提前将代码的框架构建好，这样我们在接下来的工作中会轻松很多，我们需要做的只是去修缮框架和填充内容，这样的工作量远远小于一边构造框架一边写具体代码，而且我认为提前构造框架也会降低写代码的难度。然后就是关于排序问题，我们需要掌握Java的一些类，来帮助我们排序，比如说：sort（）方法和Comparable接口。
除此之外我们还需要熟练掌握我们所用ide的一些快捷方式，不管是eclipse还是idea，可以大大节省我们写代码的时间。
四、改进建议
对于电信计费系列问题，这是一个非常经典且有代表性的问题，如果我们当时没有做出来，在后面我们也应该再去搞懂
存在很多可以改进的地方，并且也仍有很多地方存在代码复制等问题，要改进我可以从这些地方着手。
五、总结
通过这次的题目初步掌握了类的基本用法，但是对于复杂的情况出现是还是不能够清晰的分析出题目中的需求。同时对于多态和继承、容器的知识的掌握不是很清晰明白，还需要去下功夫，好好学习对于本阶段，在内容上学习了是进一步对现实问题的分析和解决，通过完成这三道题，我们可以进一步了解java对现实应用的解决途径。三次题目中都需要用不同的正则表达式来解决问题，因此在过程中对于正则表达式的使用有了进一步的了解，
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