Java: Invoke a method with an variable length argument lists with an ArrayList with arbitrary length

Question

i got a function with the following signature

foo(Object...){}

And i got an ArrayList "list"

How can i invoke the function with an ArrayList of arbitrary length. i mean how can i avoid this

if(list.size == 1){
    foo(list.get(0))
}else if(list.size == 2){
    foo(list.get(0),list.get(1))
}

Answer 1

您可以在ArrayList上调用toArray()将ArrayList传递给varargs方法foo 。

foo(list.toArray());