[JAVA]好的电梯程序的设计

public class TestGoodElevator
{
public static void main(String args[])
{
GoodElevator e2 = new GoodElevator();
e2.openDoor();
e2.closeDoor();
e2.goUp();
e2.goUp();
e2.goDown();
System.out.println("电梯在第"+e2.getFloor()+"层");
e2.openDoor();
e2.closeDoor();
e2.goDown();
e2.openDoor();
e2.closeDoor();
e2.goDown();
e2.goDown();
if(e2.getFloor()!=5&&!e2.isOpen())
e2.setFloor(5);
e2.openDoor();
e2.closeDoor();
e2.setFloor(10);
System.out.println("-------电梯测试结束-------");
}
}

class GoodElevator
{
private boolean doorOpen=false;
private int floor = 1;
private int weight = 0;
final int CAPACITY=1000;
final int TOP_FLOOR = 5;
final int BOTTOM_FLOOR = 1;

public void openDoor()
{
doorOpen = true;
}

public void closeDoor()
{
checkWeightSensors();
if(weight<=CAPACITY)
doorOpen = false;
else
System.out.println("超重，门不能关！");
}

private void checkWeightSensors()
{
weight = (int)(Math.random()*1500);
System.out.println("当前乘客总重量是:"+weight+"公斤");
}

public void goUp()
{
if(!doorOpen)
{
if(floor<TOP_FLOOR)
{
floor++;
System.out.println("电梯已上到第"+floor+"层");
}
else
System.out.println("电梯已在顶层，不能再上升");
}
else
System.out.println("电梯门未关，不能上升！");
}

public void goDown()
{
if(!doorOpen)
{
if(floor>BOTTOM_FLOOR)
{
floor--;
System.out.println("电梯已下到第"+floor+"层");
}
else
System.out.println("电梯已在最底层，不能再下降");
}
else
System.out.println("电梯门未关，不能下降！");
}

public void setFloor(int goal)
{
if(goal>=BOTTOM_FLOOR&&goal<=TOP_FLOOR)
{
while(floor!=goal)
{
if(floor<goal)
goUp();
else
goDown();
}
System.out.println("电梯按要求停在第"+goal+"层");
}
else
System.out.println("没有第"+goal+"层");
}

public int getFloor()
{
return floor;
}

public boolean isOpen()
{
return doorOpen;
}
}