How can I parse string to separate integers? Java

Question

I need to load (int) data from file. New line separates different data so it's important to know where the new line is. I can use

string=readln();

and then I have whole line in that string. Then I can

string.trim("//s+")

which chooses words(numbers) from string.

I can parse them to int:

int x = parseInt(string.trim("//s+").toString() );

Which should work (in theory) but it doesn't! There is Java.lang.something, but no number! How can I do it?

Can you show us your whole program? What errors/exceptions are you getting? — wkl
– wkl, Commented Nov 22, 2011 at 0:27
There's no String#trim(String) in java. Please edit your question. — soulcheck
– soulcheck, Commented Nov 22, 2011 at 0:29
Don't write Java off the cuff into questions. It will always be wrong. Always. In this case, what is readln()? String.trim(String)? Do you mean Integer.parseInt? — Ed Staub
– Ed Staub, Commented Nov 22, 2011 at 0:34
sorry, i can't reproduce that code now :/ Tyler's answer seems reasonable — tytan
– tytan, Commented Nov 22, 2011 at 0:43

Tyler · Accepted Answer · 2011-11-22 00:34:41Z

3

I like to use a set of two Scanners. One to read in the file line by line, assigning each new line to a temporary String, and another to read the line and gather the ints. Something like this:

Scanner sc = new Scanner(inputfile);
Scanner scanLine;
String line;
while(scanLine.hasNextLine())
{
line = sc.nextLine(); 
scanLine = new Scanner(line);
firstInt = scanLine.nextInt();
...
}

answered Nov 22, 2011 at 0:34

Tyler

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