You can use split() and split according to whitespace(s).
String str = "add John Do 123-456-789";
String[] res = str.split("\\s+");
System.out.println(Arrays.toString(res));
Now the result will be:
[add, John, Do, 123-456-789]
Now you can obtain the string values from res
array.
As stated in the comments, I suggest you to do a little research before posting questions and to give a minimal try. After you do this, if you’ll still have problems, you can ask your question here.
solved How to obtain parts of a string [closed]