【原因分析】
在条件判断语句中使用了硬编码的字面值，例如：
if (!"0".equals(retCode))
【影响分析】
这种硬编码的字面值不容易理解其含义，进而影响对逻辑表达式的理解。另外硬编码的字面值也容易在代码中重复出现，给代码的维护增加难度。
【修改建议】
建议修改。将硬编码的字面值定义成静态变量或私有的成员变量。例如：
private String CODE_ZERO = "0"; if (!this.CODE_ZERO.equals(retCode))
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