Java 프로그램 내에서 쉘 명령을 어떻게 실행할 수 있습니까?

Runtime rt = Runtime.getRuntime();
rt.exec(new String[]{"cmd.exe","/c","start"});

// Change directory and run "dir" command
ProcessBuilder builder = new ProcessBuilder(
    "cmd.exe", "/c", "cd \"C:\Program Files\Flowella\" && dir");

ProcessBuilder builder = new ProcessBuilder(
    "cmd.exe", "/c", "cd \"C:\Program Files\Flowella\" && ping www.google.com");

import java.io.*;

public class CmdCommand {
    public static void main(String[] args) throws Exception {
        String dir = "C:\Program Files\Flowella";
        ProcessBuilder builder = new ProcessBuilder(
            "cmd.exe", "/c", "cd \"" + dir + "\" && dir");
        builder.redirectErrorStream(true);
        Process p = builder.start();
        BufferedReader r = new BufferedReader(new InputStreamReader(p.getInputStream()));
        String line;
        while (true) {
            line = r.readLine();
            if (line == null) { break; }
            System.out.println(line);
        }
    }
}