实现火星车,全部由java写成

				package cn.nasa;
				
				public class Left implements IAction {
					private Direction direction;
					private Coordinate coordinate;
				
					@Override
					public Object exec() {
						direction=direction.TurnLeft();
						return direction;
					}
				
					@Override
					public void setcoordinate(Coordinate coordinate) {
						this.coordinate=coordinate;
					}
				
					@Override
					public void setdirection(Direction direction) {
						this.direction=direction;
					}
				
				}