How can I make a method take an array of any type as a parameter?

Question

I would like to be able to take in any array type as a parameter in a method.:

public void foo(Array[] array) {
    System.out.println(array.length)
}
         


        

Answer 1

As some others have mentioned, there is now way to do this if you want to be able to accept arrays of primitive types as well (unless you are doing something like in Elliott's solution where you only need and Object and can get by only using methods like Array.getLength(Object) that takes an Object as input).

What I do is make a generic method and then overload it for each primitive array type like so:

public  void foo(T[] array) {
    //Do something
}

public void foo(double[] array) {
    Double[] dblArray = new Double[array.length];

    for(int i = 0; i < array.length; i++){
        dblArray[i] = array[i];
    }
    foo(dblArray);
}
//Repeat for int[], float[], long[], byte[], short[], char[], and boolean[]