Java – ArrayList as parameter?

I want to know how to create a method that takes an ArrayList of integers (ArrayList) as a parameter and then displays the contents of ArrayList?

I have some code to generate some random numbers and populate the ArrayList with the results, but I always have error marks in eclipse when trying to create this particular method

This is what I have done so far:

public void showArray(ArrayList<Integer> array){

    return;

}

I know it's very basic, but I'm not sure how to get close to it - could it be as follows?

public void showArray(ArrayList<Integer> array){

    Arrays.toString(array);

}

Any help would be appreciated

thank you.

Solution

I assume this is a learning exercise I'll give you some tips:

>Your method is called showarray, but ArrayList < T > is of type list < T > and is not an array More specifically, it is a list implemented by using an array internally Change the parameter to an array, or fix the name of the method. > If possible, use interfaces instead of passing concrete classes to make your methods more reusable. > Small point: it may be better to let the method return a string and display the result outside the method

Try something like this:

public void printList(List<Integer> array) {
    String toPrint = ...;
    System.out.println(toPrint);
}

You can use loops and StringBuilder to construct toprint strings