vehicle a = new vehicle(5);
class vehicle{
int xPos;
int yPos;
vehicle(int tempyPos){
xPos = 0;
yPos = tempyPos;
}
void display(){
fill (0,0,255);
rect(xPos,yPos,xPos+10,yPos+10);
}
void move(){
xPos++;
  }
}
void setup(){
size(500,500);
}
void draw(){
background(255);
a.display();
if(key == 'd'){
a.move();
  }
}