[sukatoa]

Given the contents of a.txt...

You should get some patterns there.

If the example you've given is like the quote below,

S.No Description Qty. Units Rate (Rs.) Value(Rs.)
1 Aviation_Lamp 1 Nos 3700 3,700
2 Lighting_Arrester 1 Nos 1600 1,600
3 Aviataion_Lamp_Cable 31 Rmt 270 8,370

You can use Scanner class for this.

while(scannerObject.hasNext()){
       s.no = scannerObject.next();
       description = scannerObject.next();
       qty = scannerObject.next();
       unit = scannerObject.next();
       rate = scannerObject.next();
       value = scannerObject.next();
       print those values....
}

Try to have some experiments from it....
(Printing on console may be a good tests)

After that, read the Formatter class....
You can format it like the format you've post...

Formatter.format("%s\n", String);