上传W3

W3/BankAccount.java

@@ -0,0 +1,43 @@
+public class BankAccount {
+    private final String accountNumber; 
+    private String ownerName;
+    private double balance;
+    public BankAccount(String accountNumber, String ownerName) {
+        this.accountNumber = accountNumber;
+        this.ownerName = ownerName;
+        this.balance = 0.0;
+    }
+    public String getAccountNumber() {
+        return accountNumber;
+    }
+    public String getOwnerName() {
+        return ownerName;
+    }
+    public void setOwnerName(String ownerName) {
+        this.ownerName = ownerName;
+    }
+    public double getBalance() {
+        return balance;
+    }
+    public void deposit(double amount) {
+        if (amount > 0) {
+            balance += amount;
+            System.out.println("存款成功！当前余额：" + balance);
+        } else {
+            System.out.println("存款失败！金额必须大于0");
+        }
+    }
+    public void withdraw(double amount) {
+        if (amount <= 0) {
+            System.out.println("取款失败！金额必须大于0");
+        } else if (amount > balance) {
+            System.out.println("取款失败！余额不足");
+        } else {
+            balance -= amount;
+            System.out.println("取款成功！当前余额：" + balance);
+        }
+    }
+    public void showAccountInfo() {
+        System.out.println("账户号：" + accountNumber + "，户主：" + ownerName + "，余额：" + balance);
+    }
+}

W3/BankAccountTest.java

@@ -0,0 +1,10 @@
+public class BankAccountTest {
+    public static void main(String[] args) {
+        BankAccount account = new BankAccount("622848123456789", "张三");
+        account.showAccountInfo();
+        account.deposit(1000);
+        account.withdraw(300);
+        account.setOwnerName("李四");
+        account.showAccountInfo();
+    }
+}

W3/Car.java

@@ -0,0 +1,77 @@
+package com.rental;
+public class Car {
+    private String licensePlate;
+    private String brand;
+    private String model;
+    private double dailyRent;
+    private boolean isRented;
+    private static int totalCars = 0;
+    public Car(String licensePlate, String brand, String model, double dailyRent) {
+        this.licensePlate = licensePlate;
+        this.brand = brand;
+        this.model = model;
+        this.dailyRent = dailyRent;
+        this.isRented = false;
+        totalCars++;
+    }
+    public Car(String licensePlate, String brand, String model) {
+        this(licensePlate, brand, model, 300.0);
+    }
+    public String getLicensePlate() {
+        return licensePlate;
+    }
+    public String getBrand() {
+        return brand;
+    }
+    public void setBrand(String brand) {
+        this.brand = brand;
+    }
+    public String getModel() {
+        return model;
+    }
+    public void setModel(String model) {
+        this.model = model;
+    }
+    public double getDailyRent() {
+        return dailyRent;
+    }
+    public void setDailyRent(double dailyRent) {
+        if (dailyRent > 0) {
+            this.dailyRent = dailyRent;
+        } else {
+            System.out.println("Daily rent must be greater than 0, modification failed");
+        }
+    }
+    public boolean isRented() {
+        return isRented;
+    }
+    public void rentCar() {
+        if (isRented) {
+            System.out.println("The car is already rented and cannot be rented again");
+        } else {
+            isRented = true;
+            System.out.println("Car rented successfully");
+        }
+    }
+    public void returnCar() {
+        if (!isRented) {
+            System.out.println("The car is not rented, no need to return");
+        } else {
+            isRented = false;
+            System.out.println("Car returned successfully");
+        }
+    }
+    public double calculateRent(int days) {
+        return dailyRent * days;
+    }
+    public static int getTotalCars() {
+        return totalCars;
+    }
+    public void displayInfo() {
+        System.out.println("License Plate: " + licensePlate
+                + ", Brand: " + brand
+                + ", Model: " + model
+                + ", Daily Rent: " + dailyRent
+                + ", Status: " + (isRented ? "Rented" : "Available"));
+    }
+}

W3/TestCar.java

@@ -0,0 +1,25 @@
+package com.rental;
+public class TestCar {
+    public static void main(String[] args) {
+        Car car1 = new Car("XiangA12345", "BYD", "Han EV", 280.0);
+        Car car2 = new Car("XiangB67890", "Tesla", "Model 3");
+        Car car3 = new Car("XiangC00001", "Toyota", "Camry", 350.0);
+        System.out.println("=== Initial Car Information ===");
+        car1.displayInfo();
+        car2.displayInfo();
+        car3.displayInfo();
+        System.out.println("\n=== Test Rent/Return ===");
+        car1.rentCar();
+        car1.rentCar();
+        car1.returnCar();
+        car1.returnCar();
+        System.out.println("\n=== Calculate Rent ===");
+        double total = car2.calculateRent(5);
+        System.out.println("car2 5-day rent: " + total);
+        System.out.println("\n=== Test Invalid Rent ===");
+        car3.setDailyRent(-100);
+        System.out.println("car3 rent: " + car3.getDailyRent());
+        System.out.println("\n=== Total Cars ===");
+        System.out.println("Total: " + Car.getTotalCars());
+    }
+}