What does “String… params” mean if passed as a parameter? [duplicate]

Answer 1

the three dot stays for vargars. you can access it like a String[].

If a method takes as paramter a varargs, you can call it with multiple values for the vargars type:

public void myMethod(String... values) {}

you can call like myMethod("a", "b");

in myMethod values[0] is equals "a" and values[1] is equals to "b". If you have a method with multiple args, the vargars argument has to be the last: for instance:

public void myMethod(int first, double second, String... values) {}

Answer 2

From the javadocs:

public static String format(String pattern,
                                Object... arguments);

The three periods after the final parameter's type indicate that the final argument may be passed as an array or as a sequence of arguments. Varargs can be used only in the final argument position.

Answer 3

 doInBackground(String... params)
 // params represents a vararg.
 new AsyncHttpPost().execute(s1,s2,s3); // pass strings to doInbackground
 params[0] is the first string
 params[1]  is the second string 
 params[2]  is the third string 

http://developer.android.com/reference/android/os/AsyncTask.html#doInBackground(Params...)

The parameters of the asynchronous task are passed to doInBackground