330 Java Tips.pdf - FTP Server

Operational Systems & Java
that printout was broken into two pices by another printouts? I mean for example if
you do:
In 1st thread: System.out.println("1234567890");
And in 2nd thread: System.out.println("something else here");
it never will be broken like:
12345
something else here
67890
Even if Sun didn't write about it explicitly, we can see that it is synchronized or at
least behaves like synchronized that is the same for our real life.
How can I pass a string to the command line(DOS) ? Also i want to capture the
output given by the command line in a string.
Answer: Try this out:
// works for DOS
String cmds[] = new String[2];
cmds[0] = "dir"; // replace with "ls" on UNIX
cmds[1] = "c:"; // replace with "/" on UNIX
// execute the command
Process pro = Runtime.getRuntime().exec(cmds);
// wait until it's done executing
pro.waitFor();
// what did the process output from the Input pipe back to
// this process (okay, who named this stuff)?
InputStream out = pro.getInputStream();
// output it (really slowly)
int i;
while ((i = out.read()) != -1) System.out.println((char) i);
How can I take a program that runs in a DOS shell and send the text that comes
from the shell program into a Java program where it can analyzed, etc.?
Answer: From a command line, use a pipe (with the "|" symbol):
c:\> dosprogram | java JavaProgram
In the Java program, read the text from System.in:
public static void main(String[] args) throws IOException {
int nLines = 0;
BufferedReader in =
new BufferedReader(
new InputStreamReader( System.in));
for (;;) {
String line = in.readLine();
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