PrintWriter 不会输出所有字符

Question

public static void main(String[] args) throws FileNotFoundException {
// Open file containing names with FileChooser dialog
JFileChooser chooser = new JFileChooser( );
chooser.showOpenDialog(null);
File fileObj = chooser.getSelectedFile( );
// Read names and write greetings, each in their own file.
Scanner in = new Scanner(fileObj);
PrintWriter pw;
pw = new PrintWriter(new File("labels.txt"));
while (in.hasNextLine( )) {
String line = in.nextLine();
String[ ] fields = line.split(",");
String name = fields[0];
String address = fields[1];
String city = fields[2];
String state = fields[3];
String zipcode = fields[4];
pw.println(name);
pw.println(address);
pw.println(city + ", " + state + " " + zipcode);
pw.println(getBarCode(zipcode));
pw.println();
}
in.close( );
pw.close( );
}
public static int returnChecksum(String zipcode) {
int sumOfDigits = 0;
int value = 0;
int checksum = 0;
for(int i = 0; i < zipcode.length(); i++) {
if (zipcode.charAt(i) != '-'){
value = Integer.parseInt(
zipcode.substring(i,  (i + 1)));
sumOfDigits += value;
}
}
checksum = (10 - sumOfDigits % 10) % 10;
return checksum;
}
public static String getBarCode(String zipcode)  {
String chars = " 1234567890-";
String[ ] codes = {"   ", ":::||", "::|:|", "::||:", ":|::|",
":|:|:", ":||::", "|:::|", "|::|:", "|:|::", "||:::" , ""};
String retVal = "";
for(int i = 0; i < zipcode.length( ); i++) {
char c = zipcode.charAt(i);
int index = chars.indexOf(c);
String code = codes[index];
retVal += code ;
}
retVal += codes[returnChecksum(zipcode)];
return "|" + retVal  + "|";
}   

我的问题是我正在读取的地址之一的校验和为 0，并且没有将其完全输出到labels.txt文件中。结果是这样的：

Meredith Baker
1343 Maple Avenue
Denver, CO 80236-2982
||::|:||:::::|:|::||::||::::|:||:|::|::|:::|:|   |

当我需要它变成这样时：

Meredith Baker
1343 Maple Avenue
Denver, CO 80236-2982
||::|:||:::::|:|::||::||::::|:||:|::|::|:::|:|||:::|

其他一切都很完美，所有其他地址的输出就像我想要的那样，但这只是缺少的一个细节，它困扰着我。

Answer 1

如果returnChecksum()返回0，则codes[0] = " "。但是，您需要与chars数组中字符"0"的索引对应的字符串。因此，像使用其他字符一样使用indexOf。这是长版本 - 您可以简化它：

// 0 <= checksum <= 9
int checksum = returnChecksum(zipcode);
// Convert single digit number to char
char checksumAsChar = Integer.toString(checksum).charAt(0);
// Find in string. 1 <= index <= 10
int index = chars.indexOf(checksumAsChar);
retVal += codes[index];

重新排列可能更容易：

String chars = "0123456789-";
String[ ] codes = {"|:|::", ":::||", "::|:|", "::||:", ":|::|",
":|:|:", ":||::", "|:::|", "|::|:", "||:::" };