开发中可能会碰到的null的坑

测试main函数

public static void main(String[] args) {
TradeSettlementBatchQueryVO batchQueryVO = new TradeSettlementBatchQueryVO();
System.out.println(batchQueryVO.getComment() == null);
System.out.println((batchQueryVO.getComment() + "") == null);
}

打印结果：

true
false