文本文件解析器无法正常工作Java

Question

I have text file parser. And with record like

1111 SMITH ROBERT J 1900

work correctly and result is

ID: 1111 
LAST NAME: SMITH 
FIRST NAME: ROBERT
MIDDLE NAME: J
MONEY: 1900

But if middle name is empty then result is

ID: 1111 
LAST NAME: SMITH 
FIRST NAME: ROBERT
MIDDLE NAME: 1900
MONEY: 1900

Code:

StringTokenizer st = new StringTokenizer(token);
Client client = new Client();
while(st.hasMoreElements()){
    String token2 = st.nextElement().toString();
    String[] array = new String[5];
    int i = 0;
    array[i++] = new String(token2);

    String id = array[0];
    String lastName = array[1];
    String firstName = array[2];
    String middleName = array[3];
    String money = array[4];
    client.add(id);
    client.add(lastName);
    client.add(firstName);
    client.add(middleName);
    client.add(money);
}
listResult.add(client);

How i can fix it?

Answer 1

If money has a specific format (like in our case, where it seems to be a number), then you can backtrack:

• you read N values per line
• if N = 5, then you're done
• if N = 4, you can check if array[3] is a number, in that case you shift values (eg: array[4] = array[3], array[3] = "") otherwise array[4] = 0 ("no money").
• for other values of N, you have to decide what to do.

By the way, your code smells bad:

String token2 = st.nextElement().toString();
String[] array = new String[4];
int i = 0;
array[i++] = new String(token2);

1. token2 is already a String , there is no need to call new String(token2) .
2. int i = 0; array[i++] int i = 0; array[i++] => will always write the same value.
3. You can reuse the array (eg: put the line 2 before the loop) using Arrays.fill(array, null) thus avoiding new object allocation.
4. You should call your method setFirstName , setLastName , etc on your Client class, and not do something that looks like a List but is not a List .