I want to split the String String line = "20E WED 01PM 0E";
so that I have variables for each "part," where the parts would look something like:
int fDegree = 20;
String fDegreeEW = "E";
String day = "WED";
int time = 01; \\ '1' is fine too
String amPm = "PM";
int sDegree = 0;
String sDegreeEW = "E";
I was thinking of first splitting the String line
at spaces and then doing regex
on each part to get the data, but I couldn't get that to work. What would be the nicest way to split a String like this into a bunch of different variables? Note: This is not the only String I want to check. The first "20" could also be "1" or "165", for example, so the words and numbers do not necessarily have a set length. But the pattern of number, word, space, word, space, number, word, space, number, word will always be true.
Edit: I tried:
String line = "20E WED 01PM 0E";
String[] splitArray = line.split(" ");
Scanner scanner = new Scanner(splitArray[0]);
int fDegree = scanner.nextInt();
but that threw an InputMismatchException
. Can I use scanner here or no?
This regex will do it:
(\d+)(\w+)\s+(\w+)\s+(\d+)(\w+)\s+(\d+)(\w+)
See regex101 for demo (look at "match information" pane on the right).
Here's how to code:
Pattern p = Pattern.compile("(\\d+)(\\w+)\\s+(\\w+)\\s+(\\d+)(\\w+)\\s+(\\d+)(\\w+)");
String line = "20E WED 01PM 0E";
Matcher m = p.matcher(line);
if (! m.matches())
throw new IllegalArgumentException("Bad input: " + line);
int fDegree = Integer.parseInt(m.group(1));
String fDegreeEW = m.group(2);
String day = m.group(3);
int time = Integer.parseInt(m.group(4));
String amPm = m.group(5);
int sDegree = Integer.parseInt(m.group(6));
String sDegreeEW = m.group(7);
The pattern variable p
can be reused for every line.
Johnny is right about the Scanner, but you should also consider how the data will be entered. It would be a lot easier to split this information if you gave the pattern a set length.
For example, if you have the line entered as "020 E WED 13 000 E", then all you need to do is split based on the token " " (space). You would then be given a three digit degree, your cardinal direction, the day, 1:00pm on a 24 hour clock (13), another three digit degree (I'm assuming that you'll never go above 360), and another cardinal direction.
If you need to save this information in a data structure (like an array) for later, you can either use line.split() or StringTokenizer.
You don't use scanner like that. Scanner is usually for letting user input a value to the system. If you want to print out all value i suggest this:
String line = "20E WED 01PM 0E";
String[] splitted = line.split(" ");
for(int i = 0; i < splitted.length(); i++){
System.out.println(splitted[i]);
}
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