英文:
Integer.parseInt(String) throws a NumberFormatExpression
问题
我从一个包含项目名称和数量的文件中读取数据。当我尝试将数量转换为整数时，出现了NumberFormatExpression异常。我觉得这可能是由于-符号引起的，但即使去掉-，它仍然会引发异常。
String line = reader.readLine();
while (line != null) {
String[] delimiter = line.split(",");
int originalQuantity = Integer.parseInt(delimiter[1]);
line = reader.readLine();
}
文件内容：
卫生纸, -10
洗手液, 12
英文:
I'm reading in from a file that contains an item name and its quantity. I'm getting a NumberFormatExpression when I try to convert the quantity amount to an int. I feel it may be due to the - sign, but even after removing the - it stills throws the exception
String line = reader.readLine();
while (line != null) {
String[] delimiter = line.split(",");
int originalQuantity = Integer.parseInt(delimiter[1]);
line = reader.readLine();
}
the file contents:
Toilet Papers, -10
Hand sanitizers, 12
答案1
得分: 3
你在数字前面包含了一个空格。使用 trim 方法去掉它。
String line = reader.readLine();
while (line != null) {
String[] delimiter = line.split(",");
int originalQuantity = Integer.parseInt(delimiter[1].trim()); // 在这里使用 trim
line = reader.readLine();
}
英文:
You're including a space at the beginning of the number. Use the trim method to get rid of it.
String line = reader.readLine();
while (line != null) {
String[] delimiter = line.split(",");
int originalQuantity = Integer.parseInt(delimiter[1].trim()); // <-- trim here
line = reader.readLine();
}
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