字符串子字符串有意删除字符0

Question

Im currently working on a String parsing function and suddenly i found this problem. For example:

String data = "1234567890JOHN F DOE";

String ID = data.substring(0,9);
String Name = data.substring(10, 19);

the expected output I want for ID is "1234567890" however the only characters I got is only "123456789" and "0" is removed.

Are there any function I can use instead of substring(...) ?

Answer 1

您会收到"123456789"因为substring(...)方法中的end参数不包含在内，因此要获取"1234567890"您需要使用data.substring(0,10) :)

Answer 2

As said in the docs the substring(...) 's ending index is the index inputted minus one. What you want to do is have:

String data = "1234567890JOHN F DOE";
String ID = data.substring(0,10); 
String Name = data.substring(10, 20);

Output:

ID: 1234567890

Name: JOHN F DOE

Answer 3

Using substring you can simply do : str.substring (0,10); This is another way :

 String pattern="\\d+";
    String text="1234567890JOHN F DOE";
    Pattern p=Pattern.compile(pattern);
    Matcher m=p.matcher(text);
    while (m.find()) {
        System.out.println(text.substring(m.start(), m.end()));
    }

Answer 4

Let's understand the startIndex and endIndex you need to do this by the code :

String data = "1234567890JOHN F DOE";
String ID = data.substring(0,10);
String Name = data.substring(10, 20);
    System.out.println("ID:" + ID);
    System.out.println("Name: "+  Name);

Output:

ID: 1234567890

Name: JOHN F DOE