List deviceCollectCodeList = new ArrayList();
String deviceCollectCode = "a";
boolean checkDeviceCollectCode = deviceCollectCodeList.contains(deviceCollectCode);
if (checkDeviceCollectCode == true) {
System.out.println("已存在");
break;
} else {
deviceCollectCodeList.add(deviceCollectCode);
}
判断List是否包含某个元素
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