asked on

Need help w/ File input, read in line by line into array.

I need to prompt the user to enter a file name, read that file line by line. Each line in the file has four parts seperated by a space. Need to put these objects in an array.

I'm new to Java and programing, and am having a hard time figuring this out or finding examples.

Thanks,
Jim

StillUnAware

BufferedReader rf = new BufferedReader(new FileReader("filename"));

String line = rf.readLine(); //reads a line from file

String[] parts = line.split("\s"); //splits line into strings, delimeter is white space (space, tab, new line, carriage return...)

vinlnx

And to read in the whole file and nothing more put what StillUnaware said: "String line = rf.readLine(); //reads a line from file" into a while loop and check if the file has any more lines to read like so:

while(rf.ready()){
String line = rf.readLine(); //reads a line from file
}

jowens1023

ASKER

Thanks StillUnAware and vinlx,

That helps, but how do I get the lines into an array?

Thanks,
Jim

StillUnAware

BufferedReader rf = new BufferedReader(new FileReader("filename"));
while(rf.ready()){
ArrayList al = new ArrayList();
al.add(rf.readLine()); //reads a line from file and adds to ArrayList
}
Object[] objArray = al.toArray();
String[] lines = new String[objArray.length];
for(int i = 0; i < objArray.length; i++)
lines[i] = (String)objArray[i];

now 'lines' will contain lines from file 'filename'

ASKER CERTIFIED SOLUTION

zzynx

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CEHJ

This *also* looks like homework - have you finished it now guys?

StillUnAware