3.编写一个Java应用程序，设计一个汽车类Vehicle，包含的属性有车轮个数wheels和车重weight。小车类Car是Vehicle的子类，其中包含的属性有载人数loader。卡车类Truck是Car类的子类，其中包含的属性有载重量payload。每个类都有构造方法和输出相关数据的方法。
参考如下：
/**
* @author huazie
* @version 2.0.0
* @since 2.0.0
*/
public class Test {
public static void main(String[] args) {
Truck truck = new Truck(4, 1000, 5, 500);
truck.display();
}
}
class Vehicle {
private int wheels; // 车轮个数
private double weight; // 车重
public Vehicle(int wheels, double weight) {
this.wheels = wheels;
this.weight = weight;
}
public int getWheels() {
return wheels;
}
public void setWheels(int wheels) {
this.wheels = wheels;
}
public double getWeight() {
return weight;
}
public void setWeight(double weight) {
this.weight = weight;
}
public void display() {
System.out.println("Vehicle{" + "wheels=" + wheels + ", weight=" + weight + '}');
}
}
class Car extends Vehicle {
private int loader; // 载人数
public Car(int wheels, double weight, int loader) {
super(wheels, weight);
this.loader = loader;
}
public int getLoader() {
return loader;
}
public void setLoader(int loader) {
this.loader = loader;
}
public void display() {
super.display();
System.out.println("Car{" + "loader=" + loader + '}');
}
}
class Truck extends Car {
private double payload; // 载重量
public Truck(int wheels, double weight, int loader, double payload) {
super(wheels, weight, loader);
this.payload = payload;
}
public double getPayload() {
return payload;
}
public void setPayload(double payload) {
this.payload = payload;
}
public void display() {
super.display();
System.out.println("Truck{" + "payload=" + payload + '}');
}
}
我需要了解关于Java应用程序的汽车类的设计。我需要了解汽车类的具体属性和方法，以便在代码中使用该类。可以考虑以下属性：座位数、颜色、型号、制造商、速度和当前状态等。对于方法，可以考虑启动、停止、加速、刹车、获取当前速度等。请以面向对象的思想设计这个汽车类，并提供该类的实现代码。以下是参考实现：
public class Car {
private int seats;
private String color;
private String model;
private String manufacturer;
private int speed;
private boolean isRunning;
public Car(int numSeats, String carColor, String carModel, String carManufacturer) {
seats = numSeats;
color = carColor;
model = carModel;
manufacturer = carManufacturer;
speed = 0;
isRunning = false;
}
public void start() {
if(!isRunning) {
isRunning = true;
System.out.println("The car has started.");
} else {
System.out.println("The car is already running.");
}
}
public void stop() {
if(isRunning) {
isRunning = false;
speed = 0;
System.out.println("The car has stopped.");
} else {
System.out.println("The car is already stopped.");
}
}
public void accelerate(int increment) {
if(isRunning) {
speed += increment;
System.out.println("The car's speed is now " + speed + " mph.");
} else {
System.out.println("The car needs to be started first.");
}
}
public void brake(int decrement) {
if(isRunning) {
if(speed - decrement >= 0) {
speed -= decrement;
} else {
speed = 0;
}
System.out.println("The car's speed is now " + speed + " mph.");
} else {
System.out.println("The car needs to be started first.");
}
}
public int getSpeed() {
return speed;
}
}
以上就是一个简单的汽车类的实现。可以根据需求添加更多属性和方法，例如获取当前状态等。在使用该类时，可以创建一个Car对象并调用对象的方法来操作汽车。例如：
Car myCar = new Car(4, "red", "sedan", "Honda");
myCar.start();
myCar.accelerate(30);
myCar.brake(10);
myCar.stop();