如何獲取java中csv文件的行索引

Question

我的程序是驗證輸入的代碼是否爲空。條件是如果輸入了代碼號（通過csv文件）繼續，並且代碼號爲空，則顯示錯誤消息。 「代碼編號爲空：__」。 我的問題是我怎麼能假設打印代碼爲空的行的索引。

這裏是我的樣本數據（CSV）：

CRITERIA CODE NAME AGE ADDRESS 
ADD  0001 JOHN 21 USA 
ADD    MICH 16 EUR 
ADD    ALI 11 PHL 

錯誤信息應該是：

"The code number is empty in line 2." 
"The code number is empty in line 3." 

這是我目前的計劃：

private static String[] sNextLine2; 
public static Map<String,Employee> getChanges 
(String sFileName, Map<String, Employee> mEmployeeList) 
throws IOException { 
            //Read_File 
    setReader2(new CSVReader(new FileReader(sFileName))); 
    while ((sNextLine2 = reader2.readNext()) != null) { 
    switch(sNextLine2[0]) { 
     case "ADD":   
      if(sNextLine2[1].isEmpty()) { 
       System.out.println("The code number is empty in line" + lineNumber); //how to get that line number 

      } else if (mEmployeeList.containsKey(sNextLine2[1])) 
      { 
       System.out.println("Data already exist"); 
      } 
      else 
      { 
       mEmployeeList.put(sNextLine2[1],new Employee(sNextLine2[1], 
         sNextLine2[2], sNextLine2[3], sNextLine2[4], sNextLine2[5], 
         sNextLine2[6], sNextLine2[7], sNextLine2[8])); 
      } 

      break; 
    } 

我希望有人能幫助我在這個。謝謝！

Answer 1

你可以添加一個計數器，每遞增.readNext()，讓它打印，如果有一個錯誤

int counter=0; 
while ((sNextLine2 = reader2.readNext()) != null) { 
    counter++; 
    switch(sNextLine2[0]) { 
     case "ADD":   
      if(sNextLine2[1].isEmpty()) { 
       System.out.println("The code number is empty in line" + counter); //how to get that line number 

      } else if (mEmployeeList.containsKey(sNextLine2[1])) 
      { 
       System.out.println("Data already exist"); 
      } 
      else 
      { 
       mEmployeeList.put(sNextLine2[1],new Employee(sNextLine2[1], 
         sNextLine2[2], sNextLine2[3], sNextLine2[4], sNextLine2[5], 
         sNextLine2[6], sNextLine2[7], sNextLine2[8])); 
      } 

      break; 
    }