Hi,
I ran into another issue, while writing files from a loop using a PrintWriter ...
I was getting empty files (for the smaller files) if I didn't add a close() call.
This is Groovy 1.6.3 with Java 1.6.0_13 on 64-bit windows machine,
compiling with groovyc and executing with java -Xint
So .. it seems like the program exited, and the PrinterWriters
didn't ever write their output.
Code: (which has the close call -- remove to get the empty files, files 3 to 5 on my system were empty):
def binstr = { v, n=4 ->
def s = ("0"*n + Integer.toBinaryString(v))
return s.substring(s.size()-n)
}
def uniqcols = { a, b, cols=4 ->
def l = [] as HashSet
0.upto(cols-1) { bitno ->
def bitmask = 1<<bitno
switch (bitno) {
case 0 : valu = ((a&bitmask) << 1) | (b&bitmask)
break
default : valu = ((a&bitmask) >> (bitno-1)) | ((b&bitmask) >> bitno)
break
}
l << valu // add value to set
}
// println l
return l.size()
}
3.upto(8) { n ->
def lastval = 2**n - 1
def spacefill = " "*(n+1)
def fmtstr = "%${n}d "
println "${fmtstr}"
def File file = new File("k2m${n}.txt")
def PrintWriter writer = file.newPrintWriter()
// heading
writer.print spacefill
0.upto(lastval) { i -> writer.print "${binstr(i,n)} " };
writer.println ""
// data lines
0.upto(lastval) { i ->
writer.print "${binstr(i,n)} "
0.upto(lastval) { j ->
writer.print String.format(fmtstr, n-uniqcols(i,j,n))
}
writer.println ""
}
writer.close() // files 3 to 5 empty without this!
}
