请定义一个交通工具(Vehicle)的类，其中有: 属性：速度(speed)，体积(size)等等
1 public class Vehicle {
2 double speed;
3 double size;
4 Vehicle(){
5 speed=1.0;
6 size=2.0;
7 }
8 void move(){
9 }
10 void setSpeed(int speed){
11 this.speed=speed;
12 }
13 void setSize(int size){
14 this.size=size;
15 }
16 void speedUp(){
17 speed=speed+1;
18 ("汽车加速后的速度为"+speed+"千米/时");
19 }
20 void speedDown(){
21 speed=speed-1;
22 ("汽车减速后的速度为"+speed+"千米/时");
23 }
24 }
25 --------------------------------------------------------------------------------
26 public class Test {
27
28 public static void main(String[] args) {
29 // TODO Auto-generated method stub
30 Vehicle aaa=new Vehicle();
31 ("汽车的速度为"++"千米/时");
32 ("汽车的体积为"++"立方米");
33 ();
34 ();
35 }
36
37 }