How to return a list of strings in Java?

I want to return a list of strings when I call the method generateArrayList(2);

But it shows:

Method does not exist or incorrect signature: void generateArrayList(Integer) from the type anon

Here is my class:

public class StringArrayTest {      
    public static List<String> generateArrayList(integer n){
        List<String> stringArray = new List<String>();
        for (integer i=0;i<n;i++){
            String str= 'Test'+String.valueOf(i);
            stringArray.add(str);
        }
        return stringArray;
    }
}

You have few compile time errors which needs to be corrected before it can work correctly.

1. integer: It will either be an int or an Integer. Use ArrayList
2. new List<String>: It's an interface. You can't instantiate an interface.
3. 'Test': Single quotes is used for Character literal, for Strings use double quotes.
4. Also, there's no need of string.valueOf(i).

Below, I have corrected all these errors. It should work now.

public static List<String> generateArrayList(int n){
    List<String> stringArray = new ArrayList<>();
    for (int i=0;i<n;i++){
        String str= "Test" + i;
        stringArray.add(str);
    }
    return stringArray;
}