Vehicle类

public class Vehicle {int speed;int size;public Vehicle(int speed,int size) {this.speed=speed;this.size=size;}public void setSpeed(int speed){this.speed=speed;}public void setSize(int size) {this.size=size;}public void speedUp(int sp) {speed=speed+sp;}public void speedDown(int sp) {speed=speed-sp;}public void move(){System.out.println("移动速度"+speed+"体积"+size);}}

public class VehicleTest {public static void main(String[] args) {Vehicle ve=new Vehicle(50,60);ve.move();ve.speedUp(20);ve.move();ve.speedDown(10);ve.move();}}