I am trying to use the print function of PrintWriter. When I use this method, my program continues to run but all my other functions doesn't work.
public void printVertices(PrintWriter os) {
for(int i = 0; i < vert.size(); i++) {
os.print(vert.get(i) + " ");
}
os.close();
}
Again, the problem is that you
close
thePrintWriter
, which also closes the underlyingOutputStream
orWriter
.You probably added the
os.close();
statement, because otherwise thePrintWriter
will buffer the output and you won't see anything printed to the console.Closing a
PrintWriter
will firstflush()
it, then close it. You probably don't want the second part.The solution therefore is to simply
flush
thePrintWriter
: