添加 'Car'

Car

@@ -0,0 +1,95 @@
+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("日租金必须大于0，当前值：" + dailyRent + "，保持原值：" + this.dailyRent);
+        }
+    }
+
+    public boolean isRented() {
+        return isRented;
+    }
+
+    public void rentCar() {
+        if (isRented) {
+            System.out.println("车辆已租出，无法再次租用");
+        } else {
+            isRented = true;
+            System.out.println("车辆租用成功");
+        }
+    }
+
+    public void returnCar() {
+        if (!isRented) {
+            System.out.println("车辆未被租用，无需归还");
+        } else {
+            isRented = false;
+            System.out.println("车辆归还成功");
+        }
+    }
+
+    public double calculateRent(int days) {
+        return dailyRent * days;
+    }
+
+    public void displayInfo() {
+        System.out.println("车牌号：" + licensePlate);
+        System.out.println("品牌：" + brand);
+        System.out.println("型号：" + model);
+        System.out.println("日租金：" + dailyRent + " 元/天");
+        System.out.println("租用状态：" + (isRented ? "已租出" : "可租"));
+        System.out.println("------------------------");
+    }
+
+    public static int getTotalCars() {
+        return totalCars;
+    }
+}