java - 文件读取器错误

Question

这个问题已经有答案了:

What does "Incompatible types: void cannot be converted to ..." mean? (1 个回答)

已关闭 12 个月前。

我遇到错误

PersonsInfoData[i] = PersonsInfoin.setPersonsInfo(temp[0],temp[1],temp[2],temp[3],temp[4]); 

"Incompatible types: void cannot be coverted to PersonsInfo"

public void readFile(String fileName)
{
    // Try to read in the data and if an exception occurs go to the Catch section 
    try
    {
        FileInputStream fstream = new FileInputStream(fileName);
        DataInputStream in = new DataInputStream(fstream);
        BufferedReader br = new BufferedReader(new InputStreamReader(in));

        int i = 0;    // i is used as the line counter
        String line;  // line is used to temporarily store the line read in from the data file

        // Read a line from the data file into the buffer and then check whether
        //      it is null.  The while loop continues until a line read in is null.
        while ((line = br.readLine()) != null)
        {
            // Split the line of data (from the text file) and put each entry into the
    //                                             temporary array - temp[]
            String[] temp = line.split(",");
            // Save each entry into its respective PCDataRecord object.
            PersonsInfoData[i] = PersonsInfoin.setPersonsInfo(temp[0],temp[1],temp[2],temp[3],temp[4]); 
            i++;  // Increment i so we can keep a count of how many entries have been read in.
        }
        numberOfEntries = i;   // Set numberOfEntries equal to i, to remember how many entries are now in the array 
        br.close();            // Close the BufferedReader
        in.close();            // Close the DataInputStream
        fstream.close();       // Close the FileInputStream
    }
    catch (Exception e)
    {
        System.err.println("Error Reading File: " + e.getMessage());
    }
}

Answer 1

这是一个 setter 语句:

PersonsInfoin.setPersonsInfo(temp[0],temp[1],temp[2],temp[3],temp[4]); 

因此，并非所有 setter 都返回对象，在您的情况下，该方法返回什么都不返回(void)，使您的语句相当于执行以下操作:

PersonsInfoData[i] = void

这是无效的...