I know this has been around for a while. I’ve seen it, but didn’t really know what it was. Turns out its a short hand for using arrays as an argument to a method.
If you are creating a method that takes variable arguments, it is common to supply the arguments in some sort of array. Take for instance the MessageFormat type classes:
MessageFormat.format(String format, Object[] args);
In order to use this method, the caller would have to make the call something like:
MessageFormat.format(“Hello {0}, isn’t life {1}”, new Object[]{“world”,”swell”});
VarArgs allows you to shorthand this by declaring your method like:
MessageFormat.format(String format, Object… args);
Which can then be called like:
MessageFormat.format(“Hello {0}, isn’t life {1}”, “world”, “swell”);
The only stipulation is that your vararg argument is the last in the parameter list. Java then autoboxes your arguments into an Object array for you.
Nice!
