How to store variable from API call in java [duplicate]

public void getToken(String userID) throws URISyntaxException, IOException {
    URIBuilder userBuild = new URIBuilder("https://api/token");
    HttpPost post = new HttpPost(userBuild.build());
    printPost(post);
}

public void printPost(HttpPost post) throws IOException {

        HttpResponse response = client.execute(post);

        BufferedReader rd = new BufferedReader(new InputStreamReader(
                response.getEntity().getContent()));
        String line;
        while ((line = rd.readLine()) != null) {
            System.out.println(line);
        }
}

So, what I want to achieve is that I would like to save the "token" as a variable.

For example, when I run the method, "getToken()", it prints out like: {"token": "1234567" } on the console.

However, how sould I save that "1234567"? Is it related to something like getHeaders()?

Thanks in advance!