Write a program that asks the user for the name of an input text file. The text file (which could be created with NotePad) will contain integers in character format, one per line, such as follows.
12 1023 -56 84781 0 -9371
The program also asks for the name of an output file.
The program then reads the input file line by line until end of file.
Each input integer is translated
into int data (use Integer.parseInt())
and written to the output file using DataOutputStream.writeInt().
Look at the input file and output file with the DOS command DIR and, if possible, with a hex dump program.
C:\Programs>java IntCopy Input file -->ints.txt Output file -->ints.bin C:\Programs>dir 06/16/00 04:33p 1,881 IntCopy.class 06/16/00 04:33p 1,920 IntCopy.java 06/16/00 04:35p 24 ints.bin 06/16/00 04:35p 30 ints.txt
Write the input loop so it catches NumberFormatExceptions
and echos the offending line.
Here is another input file:
0 1 2 3 4 Rats, this won't work 6 7 8
And the corresponding run of the program:
C:\Programs>dir Input file -->oops.txt Output file -->opps.bin Poor input data:Rats, this won't work C:\Programs>Click here to go back to the main menu.
End of Exercises.