(process) exec() Works right in JDK1.0 but fails in JDK1.16

Name: dbT83986 Date: 01/28/99


Both of the simple example classes below, work perfectly
in JDK1.0 but fail to work correctly in JDK1.16

In ExecDemo1, I simply attempt to invoke the DOS
editor edit, with a file called foo.
Under JDK1.0 this works perfectly!
Under JDK1.16 the program ends without ever having
started edit.com


class ExecDemo1 {
   public static void main (String args[]) throws Exception {
      Runtime.getRuntime().exec("edit.com foo");
   }
}

/***********************************************/

In ExecDemo2, I invoke a directory listing via the
internal command dir. I then echo to the console the
captured dir output, via getInputStream().
Again, under JDK1.0 this works perfectly!
But, under JDK1.16, while the dir output is indeed
displayed on the console, it seems to encounter some
sort of end-of-file problem, because the program just
hangs, failing to ever print the final "Job has finished"
message. In order to exit the program I have to press
control c.

import java.io.*;
class ExecDemo2 {
   public static void main (String args[]) throws Exception {
      Process p = Runtime.getRuntime().exec("command.com /c dir");
      InputStream in = p.getInputStream();
      int c;
      while ((c=in.read()) != -1) System.out.print ((char)c);
      System.out.println("Job has finished");
   }
}
(Review ID: 33133)
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