Operational Systems & Java

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();

        if (line == null)

            break;

        nLines++;

        System.out.println(nLines + ":" + line);

   }

}

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