Test.6Vehicle

package Traffic;


public class Vehicle {
    public static void main(String[] args){
    vehicle a1=new vehicle();
    a1.setspeed(0);
    a1.setsize(0);
    a1.setspeed(6);
    a1.speedup();
    a1.speeddown();
     }
   public static class vehicle{
    int speed;
    int size;
    public void move(){
      System.out.println("车移动");
    }
    public void setspeed(int i){
    speed=i;
    System.out.println("speed:"+speed);
    }
    public void setsize(int j){
    size=j;
    System.out.println("size:"+size);
    }
    public void speedup(){
    speed=speed*2;
    System.out.println("speedup:"+speed);
    }
    public void speeddown(){
   
        speed=speed/4;
    System.out.println("speeddown:"+speed);
    }
   
    }
}