Run CMD with Java

package runcmd;

import java.io.*;

public class CmdTest {

    public static void main(String[] args) throws Exception {
        ProcessBuilder builder;
        Process p;
        BufferedReader r;
        String line;

        while (true) {
            System.out.println("_________C__________");
            builder = new ProcessBuilder("cmd.exe", "/c", "cd C: && dir"); // xem danh sách file, folder ổ C
            builder.redirectErrorStream(true);
            p = builder.start();

            // Xuất ra console
            r = new BufferedReader(new InputStreamReader(p.getInputStream()));
            while (true) {
                line = r.readLine();
                if (line == null) {
                    break;
                }
                System.out.println(line);
            }

            Thread.sleep(2000); // Dừng trong 2s

            System.out.println("_________D__________");
            builder = new ProcessBuilder("cmd.exe", "/c", "cd D: && dir"); // xem danh sách file, folder ổ D
            builder.redirectErrorStream(true);
            p = builder.start();

            // Xuất ra console
            r = new BufferedReader(new InputStreamReader(p.getInputStream()));
            while (true) {
                line = r.readLine();
                if (line == null) {
                    break;
                }
                System.out.println(line);
            }

            Thread.sleep(10000); // Dừng trong 10s
        }


    }
}