public Lamp blackOut() {
this.lighted = false;
if (opposite != null)
Lamp.valueOf(opposite).blackOut();
Lamp nextLamp = Lamp.valueOf(next);//为啥这里把Lamp nextLamp=null换成了
//=Lamp.valueOf(next);运行结果就会有问题呢。这里怎么先赋值初始化和先赋值null,然后在代码里再赋具体值差别很大呀!
if (next != null) {
System.out.println("绿灯从" + name() + "方向变成----》" + next + "方向");
// nextLamp = Lamp.valueOf(next);
nextLamp.light();
}
return nextLamp;
}
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