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String matnrs = matnrStr.substring(0, matnrStr.length());
Call to 'substring(0, matnrStr.length())' is redundant less... (Ctrl+F1)
redundant被裁减的 多余的操作
Reports a variety of redundant String-related operations like calling String.toString() or String.substring(0).
应该这样写
String matnrs = matnrStr.substring(0, matnrStr.length()-1);