Vehicle 类
public class Vehicle { double speed;//声明double型变量speed,刻画速度 int power;//声明int型变量power,刻画功率 void speedUp(int s){ speed=speed+s;//将参数S的值与成员变量speed的和赋值给成员变量speed } void speedDown(int d){ speed=speed-d;//将成员变量speed与参数d的差赋值给成员变量speed } void setPower(int p){ power=p;//将参数p的值赋值给成员变量power } int getPower(){ return power;//返回成员变量power的值 } double getSpeed(){ return speed; } }
User 类
public class User { public static void main(String args[]){ Vehicle car1,car2; car1=new Vehicle();//使用new运算符和默认的构造方法创建对象car1 car2=new Vehicle();//使用new运算符和默认的构造方法创建对象car2 car1.setPower(128); car2.setPower(76); System.out.println("car1的功率是:"+car1.getPower()); System.out.println("car2的功率是:"+car2.getPower()); car1.speedUp(80);//car1调用speedUp()方法将自己的speed的值增加80 car2.speedUp(80);//car2调用speedUp()方法将自己的speed的值增加80 System.out.println("car1目前的速度:"+car1.getSpeed()); System.out.println("car2目前的速度:"+car2.getSpeed()); car1.speedDown(10); car2.speedDown(20); System.out.println("car1目前的速度:"+car1.getSpeed()); System.out.println("car2目前的速度:"+car2.getSpeed()); } }