Android Java - String Variable inside a String?

Question

I am looking for a solution to add inside a String URL a variable (Post parameter).

SharedPreferences sp = getPreferences(MODE_PRIVATE);    
String my_variable = "test";
private  static final String READ_COMMENTS_URL = "http://xxx/comments.php?usernames= my_variable";  

It should eventually possible with string.format. Can anyone give a hint?

Answer 1

SharedPreferences sp = getPreferences(MODE_PRIVATE);    
String my_variable = "test";
private  static final String READ_COMMENTS_URL = "http://xxx/comments.php?usernames= "+my_variable;