Java —— 类的继承

//class Testimport java.util.Scanner;public class Test {public static void main(String[] args){Scanner scanner = new Scanner(System.in);Vehicle v = new Vehicle();System.out.println(v.toString());Car c = new Car();System.out.println(c.toString());int speed,whl;String clo;clo = scanner.next();speed = scanner.nextInt();whl = scanner.nextInt();c.setColor(clo);c.setSpeed(speed);c.setNbWheels(whl);System.out.println(c.toString());/* *  * isMove()函数是Car类的父类所拥有的方法成员。 * Car类通过对Vehicle类的继承，可以直接通过Car类的对象引用来对isMove()方法调用。 *  */if(c.isMove()){System.out.println("This car is moving");}else System.out.println("This car is not moving");//该for循环是为了验证decelerate()和isMove()的方法的for(int i = 0; i<10; i++)c.decelerate();if(c.isMove()){System.out.println("This car is moving");}else System.out.println("This car is not moving");}}//class Car//Accelerate: speed = speed + 1;//Decelerare: speed = speed - 1;public class Car extends Vehicle {private int nbWheels;public  Car(){System.out.println("I am a car");}public String toString(){return "I am a " + super.getColor() + " car,speed: "+ super.getSpeed()+". And my nbWheels are "+nbWheels;}public int getNbWheels() {return nbWheels;}public void setNbWheels(int nbWheels) {this.nbWheels = nbWheels;}}//class Vehiclepublic class Vehicle {private int speed;private String color;public Vehicle(){System.out.println("I am a Vehicle");speed = 0;color = "blue";}public void accelerate(){speed ++;}public void decelerate(){if(getSpeed() >= 1)speed --;}public boolean isMove(){if(getSpeed() > 0)return true;return false;}public String toString(){return "I am a "+color+" vehicle and my current speed is " + speed; }public int getSpeed() {return speed;}public void setSpeed(int speed) {this.speed = speed;}public String getColor() {return color;}public void setColor(String color) {this.color = color;}}