Java Error - Actual and Formal Argument Lists Differ in Length

Actual or formal argument lists differs in length

You try to instantiate an object of the Friends class like this:

Friends f = new Friends(friendsName, friendsAge);

The class does not have a constructor that takes parameters. You should either add the constructor, or create the object using the constructor that does exist and then use the set-methods. For example, instead of the above:

Friends f = new Friends();
f.setName(friendsName);
f.setAge(friendsAge);

Java Error - Actual and formal argument lists differ in length

Well it's quite simple. Here's the declaration of setShippingDest:

public void setShippingDest(String inCustName, String inDestn)

And here's how you're trying to call it:

shipOrder.setShippingDest("Broome");

You've provided one argument, but there are two parameters? How do you expect that to work? You either need to provide another argument, or remove one parameter.

(I'd also strongly advise that you remove the in prefix from all of your parameters, and look into a real unit testing framework such as JUnit, rather than writing an enormous main method.)

actual and formal argument lists differ in length error

The problem is that PokemonTrainer only has a constructor that has one String as parameter:

public class PokemonTrainer
{
    public PokemonTrainer(String name) {
        ...
}

but you are not calling that constructor from ComputerTrainer:

public class ComputerTrainer extends PokemonTrainer
{
    public ComputerTrainer(String name) {
        this.name = name;
        ...
    }
}

Java does not automatically call the constructor of the superclass that matches the actual constructor, it calls the default (parameter-less constructor) but the superclass does not have it.

Solution: add an explicit invokation of the correct constructor of the superclass:

public class ComputerTrainer extends PokemonTrainer
{
    public ComputerTrainer(String name) {
        super(name);
        ...
    }
}

see Java Language Specification 8.8.7. Constructor Body for more details

_{Note: the error message is a bit confusing since there is like a hidden super() call as first statement in the ComputerTrainer constructor}

Actual and formal arguments lists differ in length error

You are making multiple calls to the addBinary() method.
However, the method requires 2 arguments and in each call to the method, you are only providing 1 argument, hence the error.

For example:

addBinary(arraytwo);

Actual and formal argument lists differ in length error in android studio

the way you have it there, it is perceived by compiler as wrong arguments passed to constructor. Without longer explanation, try this:

mContentsViewModel = ViewModelProvider.of(this).get(ContentsViewModel.class);