I am relatively new to Java
programming and I have an assignment which I am finding difficult to understand. Its is basically an I/O program with string manipulation.
I have one input file, pb.txt, which looks like this;
01/23/16 -22 32- 34- 40- 69 PB 19 X4 01/13/16 -27 29- 34- 41- 44 PB 2 X3
01/20/16 -5 39- 44- 47- 69 PB 24 X5 01/09/16 -12 31- 43- 44- 57 PB 11 X2
01/16/16 -3 51- 52- 61- 64 PB 6 X2 01/06/16 -6 37- 39- 45- 55 PB 33 X3
Here is the Problem statement;
Output the data file pbo.txt will look as follows:
dateIndex n1 n2 n3 n4 n5 pb
1 22 32 34 40 69 19
Note that spaces must separate the numbers.
I have done simple file I/O programs myself, but this one is tricky for me. I am unable to understand how I should separate the required lines from the file as there is other things written in the file as well, but I have to separate only the ones which are stated above. I appreciate any kind of help that I can get regarding this.
This is my first time posting on Stack Overflow so forgive me if I did something wrong.
Regards.
If the file is not too big, you can read all the lines as described in the accepted answer here .
If the file can be big, it would be better to use any other API to read a file line by line.
This first step shouldn't be so difficult.
On each line, you can then use a regular expression to find the necessary information.
The following link shows an example of a regular expression that matches your input: Regex
You cannot use it exactly as is, but it is a starting point.
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