根据类图,实现java代码:@startuml class BankAccount { -accountNumber : String -balance : double -ownerName : String +BankAccount(accountNumber:String, ownerName:String) +getAccountNumber():String +getBalance():double +getOwnerName():String +deposit(amount:double):void +withdraw(amount:double):void } class BankAccountDAO { -accounts : Map<String, BankAccount> -fileName : String +BankAccountDAO(fileName:String) +getAccount(accountNumber:String):BankAccount +getAllAccounts():List<BankAccount> +addAccount(account:BankAccount):void +updateAccount(account:BankAccount):void +deleteAccount(accountNumber:String):void -saveToFile():void } BankAccount -> BankAccountDAO @enduml

时间: 2024-02-01 10:13:48 浏览: 26
```java import java.util.*; class BankAccount { private String accountNumber; private double balance; private String ownerName; public BankAccount(String accountNumber, String ownerName) { this.accountNumber = accountNumber; this.ownerName = ownerName; this.balance = 0.0; } public String getAccountNumber() { return this.accountNumber; } public double getBalance() { return this.balance; } public String getOwnerName() { return this.ownerName; } public void deposit(double amount) { this.balance += amount; } public void withdraw(double amount) { if (balance >= amount) { this.balance -= amount; } else { System.out.println("Insufficient funds!"); } } } class BankAccountDAO { private Map<String, BankAccount> accounts; private String fileName; public BankAccountDAO(String fileName) { this.accounts = new HashMap<>(); this.fileName = fileName; // TODO: load accounts from file into accounts map } public BankAccount getAccount(String accountNumber) { return accounts.get(accountNumber); } public List<BankAccount> getAllAccounts() { return new ArrayList<>(accounts.values()); } public void addAccount(BankAccount account) { accounts.put(account.getAccountNumber(), account); saveToFile(); } public void updateAccount(BankAccount account) { accounts.replace(account.getAccountNumber(), account); saveToFile(); } public void deleteAccount(String accountNumber) { accounts.remove(accountNumber); saveToFile(); } private void saveToFile() { // TODO: write accounts map to file } } ```

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use java language ,In this project you need to write a book lending system for a Library. The system has different roles for registered users. There are two types of user roles: borrower and lender. Write an IUser interface for library users, with the following UML specification: +----------------------------------+ | <<interface>> | | IUser | +----------------------------------+ | + getName(): String | | + getBook(): int | | + moreBook(int number): void | +----------------------------------+ and a User class that implements IUser and has the following UML specification: +-----------------------------------+ | User | +-----------------------------------+ | - name: String | | - book: int | +-----------------------------------+ | + User(String name, int book) | | + getName(): String | | + getBook(): int | | # setBook(int book): void | | + moreBook(int number): void | | + testUser(): void | +-----------------------------------+ The name instance variable indicates the user name. The book instance variable indicates the number of books borrowed by the user. The setBook method changes the number of books borrowed by the user. The setBook method is protected, not public. This means that only subclasses of the User class can use the setBook method. All the other classes in the system cannot use the setBook method, so they cannot change the number of books borrowed by a user. The purpose of the moreBook method is to increase the number of books borrowed or lent by the user (depending on what kind of user it is) by the number given as argument to the method. The moreBook method of the User class is abstract, since we do not know what kind of role the user is (a borrower borrows books from other users and a lender lend books to other users). Also add to your program a Test class to test your User class. public class Test { public static void main(String[] args) { User.testUser(); } }

完成以下Java代码:Write an IShape interface with the following UML specification: +------------------------------------+ | <<interface>> | | IShape | +------------------------------------+ | + getX(): int | | + getY(): int | | + setX(int x): void | | + setY(int y): void | | + isVisible(int w, int h): boolean | | + isIn(int x, int y): boolean | | + draw(Graphics g): void | +------------------------------------+ and a Shape class that implements IShape and has the following UML specification: +------------------------------------+ | Shape | +------------------------------------+ | - x: int | | - y: int | | - color: Color | +------------------------------------+ | + Shape(int x, int y) | | + getX(): int | | + getY(): int | | + setX(int x): void | | + setY(int y): void | | + isVisible(int w, int h): boolean | | + isIn(int x, int y): boolean | | + draw(Graphics g): void | | + testShape(): void | +------------------------------------+ The x and y instance variables indicate the position of the center of the shape, and the color instance variable indicates the color of the shape. The color of the shape is computed randomly in the constructor of the shape class and never changes after that, like this: color = new Color((float)Math.random(), (float)Math.random(), (float)Math.random()); The isVisible method is abstract, and indicates whether the shape is currently visible or not inside a window of width w and of height h. The isIn method is abstract, and indicates whether the point at coordinates (x, y) is currently inside the shape or not. The draw method simply changes the color of the graphics object g to be the correct color for the shape

Add a Library class with the following UML specification: +-------------------------------------------+ | Library | +-------------------------------------------+ | - name: String | | - users: ArrayList | +-------------------------------------------+ | + Library(String name) | | + addUser(IUser user): void | | + totalBorrowedBooks(): int | | + getBook(String name): int | | + moreBook(String name, int number): void | | + testLibrary(): void | +-------------------------------------------+ When a library is created, it has an arraylist of users (IUser) but the arraylist is empty (the arraylist does not contain any user). The addUser method takes a user (IUser) as argument and adds the user to the arraylist of users for the library. The totalBorrowedBooks method returns as result the total number of books borrowed by all users of the library (the result can be either positive or negative). The getBook method takes as argument the name of a user and returns as result the number of books currently borrowed by the user. If the library does not have a user with the given name, then the getBook method must throw an UnknownUserException with the message "User XXX unknown.", where XXX is replaced with the name of the user. Do not worry about multiple users having the same name. You can assume all user names are unique in the arraylist. The moreBook method takes as argument the name of a user and a number of books and changes the number of books currently borrowed by that user. If the library does not have a user with the given name, then the moreBook method must throw an UnknownUserException with the message "User XXX unknown.", where XXX is replaced with the name of the user. Do not worry about multiple users having the same name. Note: the moreBook method does not catch any exception, it only throws exceptions. Hint: use the equals method to compare strings, not the == operator which only works with constant strings. 写java文件

continue to use Java language, Add a Library class with the following UML specification: +-------------------------------------------+ | Library | +-------------------------------------------+ | - name: String | | - users: ArrayList<IUser> | +-------------------------------------------+ | + Library(String name) | | + addUser(IUser user): void | | + totalBorrowedBooks(): int | | + getBook(String name): int | | + moreBook(String name, int number): void | | + testLibrary(): void | +-------------------------------------------+ When a library is created, it has an arraylist of users (IUser) but the arraylist is empty (the arraylist does not contain any user). The addUser method takes a user (IUser) as argument and adds the user to the arraylist of users for the library. The totalBorrowedBooks method returns as result the total number of books borrowed by all users of the library (the result can be either positive or negative). The getBook method takes as argument the name of a user and returns as result the number of books currently borrowed by the user. If the library does not have a user with the given name, then the getBook method must throw an UnknownUserException with the message "User XXX unknown.", where XXX is replaced with the name of the user. Do not worry about multiple users having the same name. You can assume all user names are unique in the arraylist. The moreBook method takes as argument the name of a user and a number of books and changes the number of books currently borrowed by that user. If the library does not have a user with the given name, then the moreBook method must throw an UnknownUserException with the message "User XXX unknown.", where XXX is replaced with the name of the user. Do not worry about multiple users having the same name. Note: the moreBook method does not catch any exception, it only throws exceptions. Hint: use the equals method to compare strings, not the == operator which only works with constant strings.

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