response to the execution of an commande by code java

hello
in my java program I excecute a command through the code => it works
but as I stepped into the prog : I found myself with a command that requires an answer after his execution

then by java program: I do not know how to answer but in the command line I responds with yes and it works
do you have any idea how to respond through the java code
I hope you understand the question:
Here's the code I use for execute command DOS :

Code :

---

public static String importer_certificat(String alias,String nom_certi,String nom_keystore,String pass_keystore)
    {
        try{
 
            String b = "keytool -import -alias "+alias+" -file "+nom_certi+" -keystore "+nom_keystore +" -storepass "+pass_keystore;
            System.out.println(b);
            Process p = Runtime.getRuntime().exec(b);
            BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));
            String inputLine, tous = "";
            while ((inputLine = in.readLine()) != null)
            {
                tous += "\n"+inputLine;
                System.out.println(inputLine);
            } 
            return tous;
 
        }catch(Exception e)
        {
            e.printStackTrace();
            return e.getMessage();
        }
    }

---

thank you in advance

The Process class has methods for getting streams for output from the process and for input to the process. See the API doc

I don't found

Here is a link to the API doc:
Java Platform SE 6