Java Execute Console Process and Get Output

To execute process you can use ProcessBuilder, like this:

ProcessBuilder pb = new ProcessBuilder("tasklist").redirectErrorStream(true);

use redirectErrorStream to make the BufferedReader can read if error message is returned.

Now, get the Process by executing it:

Process p = pb.start();

Then make a BufferedReader that can read the console output screen:
BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));

You can read the respond of console process by using while loop like this:

while((str = br.readLine()) != null){
    retVal += str;
}

Here is the complete java function:

public static String run(String cmd) {
        String retVal = "";
        try {
            ProcessBuilder pb = new ProcessBuilder(cmd).redirectErrorStream(true);
            Process p = pb.start();
            BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));
            String str;
            while((str = br.readLine()) != null){
                retVal += str;
            }
        } catch (IOException ex) {
            retVal = ex.getMessage();
        }
        return retVal;
    }