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