处理 FileReader 和 subString

Question

我正在尝试读取一个文件 .txt，其中包含不同地区的 8 行商店。每行有 15 个字符。当我运行这段代码时，只打印第一行，然后抛出：

Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 10
    at java.lang.String.substring(String.java:1951)

String line = "";
String region = "", name = "";
BufferedReader file = new BufferedReader(new FileReader("Stores.txt"));
line = file.readLine();
while (line != null) {
    region = line.substring(0, 10);
    name = line.substring(10);
    line = file.readLine();
    System.out.println("" + region + name);
}
file.close();

文件：

Montrèal   16890

New York   27659

Pittsburg  26657

California 11201

Virginia   32945

Seattle    33981

Colorado   10345

Answer 1

我检查了子字符串前的行的长度

String line = "";
String region = "", name = "";
BufferedReader file = new BufferedReader(new FileReader("Stores.txt"));
line = file.readLine();
while (line != null) {
    if (!line.isEmpty()&&line.length() >= 15) {
        region = line.substring(0, 10);
        name = line.substring(10);
        line = file.readLine();
        System.out.println("" + region + name);
    }
}
file.close();

Answer 2

不要跳过空行。试试这个：

String line = "";
String region = "", name = "";
BufferedReader file = new BufferedReader(new FileReader("Stores.txt"));
line = file.readLine();
while (line != null) {
    if (!line.isEmpty()) {
        region = line.substring(0, 10);
        name = line.substring(10);
        System.out.println("" + region + name);
    }
    line = file.readLine();
}
file.close();

处理 FileReader 和 subString

Dealing with FileReader and subString

java

substring

filereader