java中 switch 的用法

String daiM = "H";
String mingCh = "";
switch (daiM) {case "S":mingCh = "车速";break;case 'W':mingCh = "称重";break;case 'Z':mingCh = "制动";break;case 'H':mingCh = "灯光";break;case 'A':mingCh = "侧滑";break;}