How to call a varargs method with an additional argument from a varargs method

delegates, java, variadic-functions

Solution

Now I see only one way: create array with dimension [args] + 1 and copy all items to new array.

There is no simpler way. You need to create a new array and include `myobj` as last element of the array.

String[] args2 = Arrays.copyOf(args, args.length + 1);
args2[args2.length-1] = myobj;
sys(args2);

If you happen to depend on Apache Commons Lang you can do

sys(ArrayUtils.add(args, myobj));

or Guava

sys(ObjectArrays.concat(args, myobj));

Problem

I have some varargs system function, where T is some actual type, like `String`: ``` sys(T... args) ``` I want to create own function, which delegates to the system function. My function is also a varargs function. I want to pass through all the arguments for my function through to the system function, plus an additional trailing argument. Something like this: ``` myfunc(T... args) { T myobj = new T(); sys(args, myobj); // <- of course, here error. } ``` How do I need to change the line with the error? Now I see only one way: create array with dimension [args] + 1 and copy all items to the new array. But maybe there exists a more simple way?

Original source