public class MyCustomObject { private int id; private String name; public MyCustomObject (int id, String name) { this.id = id; this.name = name; } public int getId() { return this.id; } public void setId(int id) { this.id = id; } public String getName() { return this.name; } public void setName(String name) { this.name = name; } } MyCustomObject mco1 = new MyCustomObject(1,"foo"); MyCustomObject mco2 = new MyCustomObject(2,"bar"); ArrayList listOfCustomObjects = new ArrayList<>(); listOfCustomObjects.add(mco1); listOfCustomObjects.add(mco2); listOfCustomObjects.get(0).setId(3); String secondsName = listOfCustomObjects.get(1).getName(); You can easily access methods of object present in the List, by using their index for example: list.get(int index). Another way would be to iterate through all the objects and performing some action. Keep in mind all the elements of the list should be of the same type or extend the same type. It is not recommended but if you really want to you can create ArrayList that can pretty much hold all different types, Custom objects, Integers, Strings. More on reddit.com

What is the error/problem? You absolutely have to include the error message verbatim, as the compiler/runtime gives. Luckily, the problem is easy to spot: you are trying to call a method resourceList.add(log) outside of any method. This does not work in Java. You can only declare variables and initialize them, but not perform other operations outside methods. You will need to add the above method call into some method, e.g. into public static void main (at least for testing). Commonly, you would have a method addResource that takes in a Resource instance (object of type Resource) which does exactly what you do in the above, quoted line - adds the resource to the ArrayList. Alternatively, and I wouldn't recommend it without looking deeper into it, you could use a static initializer block right after your public static ArrayList... declaration. Edit: Sidenote: be wary of making everything static. Don't even get into that habit. Not even at the beginning. Try to avoid it by default. There is nothing wrong with making things non-static and instantiating even a single object of that class. Getting into the habit of not using static will help you extremely much in the long run and will make your OOP programming much easier and better (even though in the beginning it seems to be the opposite). More on reddit.com

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How often do software engineers use ArrayList? Always. I write readable, maintainable code. I'm not "l33t h4xor", I'm fucking working. More on reddit.com