题目：
在Car.java中给Engine添加一个service()方法，并在main()中调用该方法。
解答：
先提供原先的Car.java代码：
class Engine {
public void start() {
}
public void rev() {
}
public void stop() {
}
}
class Wheel {
public void inflate(int psi) {
}
}
class Window {
public void rollup() {
}
public void rolldown() {
}
}
class Door {
public Window window = new Window();
public void open() {
}
public void close() {
}
}
public class Car{
public Engine engine = new Engine();
public Wheel[] wheel = new Wheel[4];
public Door left = new Door(), right = new Door();
public Car() {
for(int i = 0; i<4; i++){
wheel[i] = new Wheel();
}
}
public static void main(String[] args){
Car car = new Car();
car.left.window.rollup();
car.wheel[0].inflate(72);
}
}
根据上面的代码，来完成题目的要求：
class Engine {
public void start() {
}
public void rev() {
}
public void stop() {
}
public void service() {
System.out.println("This is the service function for the Engine");
}
}
class Wheel {
public void inflate(int psi) {
}
}
class Window {
public void rollup() {
}
public void rolldown() {
}
}
class Door {
public Window window = new Window();
public void open() {
}
public void close() {
}
}
public class Car{
public Engine engine = new Engine();
public Wheel[] wheel = new Wheel[4];
public Door left = new Door(), right = new Door();
public exerciseThree() {
for(int i = 0; i<4; i++){
wheel[i] = new Wheel();
}
}
public static void main(String[] args){
Car car = new Car();
car.left.window.rollup();
car.wheel[0].inflate(72);
car.engine.service();
}
}
结果如下：
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