Executar .bat no Java

package br.com.agente;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Teste2 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		try {
			Process processo = Runtime.getRuntime().exec("C:\\programa-java\\PluginDemo\\executa.bat");
			if(processo.isAlive()) {
				System.out.println("Processo esta ativo...");
			}
			
	        System.out.println("Result:");
	        BufferedReader reader = new BufferedReader(new InputStreamReader(processo.getInputStream()));

	        String line = "";
	        while ((line = reader.readLine()) != null) {
	        	System.out.println(line);
	        }
		} catch (IOException e) {
			// TODO Auto-generated catch block
			System.out.println(e.getMessage());
		}
	} 
 
}