Вызов runas через командную строку windows

String commands [] = new String [] { "CMD.EXE","/C","runas"};
Process p=Runtime.getRuntime().exec(commands);
 
BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
while ((line = input.readLine()) != null)
    System.out.println(line);
BufferedReader error = new BufferedReader(new InputStreamReader(p.getErrorStream()));
while ((line = error.readLine()) != null)
    System.out.println(line);

String commands [] = new String [] { "CMD.EXE","/C","help"};

String commands [] = new String [] { "CMD.EXE","/C","net user test test /add"};

try{
            String  commands [] = new String [] { "CMD.EXE","/C",
                    "runas /profile /user:username \"notepad C:\\1.txt\""};
            Process p=Runtime.getRuntime().exec(commands);
            BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
            BufferedReader error = new BufferedReader(new InputStreamReader(p.getErrorStream()));
            BufferedOutputStream output = new BufferedOutputStream(p.getOutputStream()); 
            int exitVal=p.waitFor();
            String line;
            while ((line = input.readLine()) != null) 
                System.out.println(line);            
            while ((line = error.readLine()) != null) 
                System.out.println(line);
            line="password";
            byte[] b=line.getBytes();
            output.write(b, 0, b.length);
            output.flush();
            System.out.println(exitVal);
        }
        catch(Throwable e){e.printStackTrace();}

String  commands [] = new String [] { "CMD.EXE","/C","echo hello"};

line="echo hello";

String  commands [] = new String [] { "CMD.EXE","/C","echo hello"};

String  commands [] = new String [] { "echo hello"};

class InputToOutputStream extends Thread {
 
    private final InputStream is;
    private final OutputStream os;
    private boolean interrupted;
 
    public InputToOutputStream(ThreadGroup tg, InputStream is, OutputStream os) {
        super(tg, tg.getName());
        if (is == null || os == null) {
            throw new IllegalArgumentException();
        }
        this.is = is;
        this.os = os;
    }
 
    @Override
    public void run() {
        byte[] buf = new byte[256];
        try {
            // we don't use interrupted() for a performance reason
            while (!interrupted) {
                if (is.available() > 0) {
                    int n = is.read(buf, 0, buf.length);
                    os.write(buf, 0, n);
                    os.flush();
                }
                yield();
            }
        } catch (IOException e) {
            throw new RuntimeException(e.getMessage(), e);
        }
    }
 
    @Override
    public void interrupt() {
        interrupted = true;
        super.interrupt();
    }
}

public static void main(String[] args) throws Exception {
    ThreadGroup group = new ThreadGroup("External process IO");
    try {
        Process proc = Runtime.getRuntime().exec("cmd.exe");
        new InputToOutputStream(group, proc.getInputStream(), System.out).start();
        new InputToOutputStream(group, proc.getErrorStream(), System.err).start();
        new InputToOutputStream(group, System.in, proc.getOutputStream()).start();
        int ret = proc.waitFor();
        System.out.println("Return code: " + ret);
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        group.interrupt();
    }
}