Java-机动车

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car1car2=new Vehicle();//使用new运算符和默认的构造方法创建对象car2car1.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80car2.speedUp(80);//car2调用speedUp()方法将自己的speed的值增加80System.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());}}