如何在Java中执行系统命令并与其他应用程序交互？

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.nio.file.Paths;

public class CmdExec {

  public static void main(String args[]) {
    try {
      // Enter code here
      Process p = Runtime.getRuntime().exec(
          Paths.get(System.getenv("windir"), "system32", "tree.com /A").toString()
      );

      // Enter code here
      try (BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()))) {
        String line;
        while ((line = input.readLine()) != null) {
          System.out.println(line);
        }
      }
    } catch (Exception err) {
      err.printStackTrace();
    }
  }
}