Java Program to read text file

Question

I have a text file like

vinoth   5001   chennai    programmer
ramesh   7755   madurai    tester
suresh   7452   namakal    designer
salim    4652   salem      programmer

I want to find with their designation but want to save their other details in an array. how can i do that? any suggestions

Please, give more information. Which of the columns is designation? Can any of the columns contain whitespaces? Is there anything other special about any of the columns(for instance is the second always 4 digits)? — Ivaylo Strandjev
– Ivaylo Strandjev, Commented Sep 20, 2012 at 6:30

Andrew Thompson · Accepted Answer · 2012-09-20 06:30:06Z

1

Use String.substring(start, end) to get the relevant part of the line.
Call trim() on it.

answered Sep 20, 2012 at 6:30

Andrew Thompson

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5 Comments

Javid Over a year ago

thanks for ur help. if u can provide me a program please provode it

MadProgrammer Over a year ago

@Javid Make an attempt, ask questions when you get stuck

Andrew Thompson Over a year ago

Thanks for spelling words like 'your' correctly. If you can provide me money, please provide it.

MadProgrammer Over a year ago

If you know none of the entries will contain spaces you could use String.split(" "), but I prefer Andrew's approach

Andrew Thompson Over a year ago

@Mad So do I! As soon as the data was formatted and it became obvious this was 'fixed column width', substring() just jumped out at me.

Alex · Accepted Answer · 2012-09-20 06:33:07Z

1

Read the file line by line
call String.split to split the different informations into an array
You can store these information in a Map whose key would be the username vinoth and values would be the array you just received from String.split
Even better you store these informations in an object that represents something with the properties you'd like.

answered Sep 20, 2012 at 6:33

Alex

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Comments

Frankline · Accepted Answer · 2012-09-20 06:34:13Z

1

Read each line using buffered reader and then do that:

HashMap<String, String> values = new HashMap<String, String>;

// read the line here
String line = ...;
String strings[] = line.split(" ");
String designation = strings[3];
values.put(strings[0], strings[1], strings[2]);

answered Sep 20, 2012 at 6:34

Frankline

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