public enum Lamp {
     S2N("N2S","S2W",false),S2W("N2E","E2W",false),E2W("W2E","E2S",false),E2S("W2N","S2N",false),
     N2S(null,null,false),N2E(null,null,false),W2E(null,null,false),W2N(null,null,false),
     S2E(null,null,true),E2N(null,null,true),N2W(null,null,true),W2S(null,null,true);
     private boolean lighted; //是否是亮的
     private String lampString; //灯的名字
     private String nextString; //下一个灯

     private Lamp(String lampString, String nextString, boolean lighted) {
     this.lampString = lampString;
     this.nextString = nextString;
     this.lighted = lighted;
}

特别是N2S怎么在S2N里换做参数了？

参数是交通灯的变换规则吧