Returning an Object [Java]

Your method getNumber is returning a reference to an object, essentially a pointer. So you're printing a pointer which is a memory address, and that is why it seems like you're printing a random number.
If can either have getNumber return the number that you want, or you can over ride the objects toString method to print what you want. A couple options for you.

Your method getNumber is returning a reference to an object, essentially a pointer. So you're printing a pointer which is a memory address, and that is why it seems like you're printing a random number.
If can either have getNumber return the number that you want, or you can over ride the objects toString method to print what you want. A couple options for you.

Can you show me how you would print it? I can't get it to work.

What does "I can't get it to work mean". What did you try?

An interesting thing to research: when you print an object, what happens? Not what you expect to happen, but look into the detail of what happens when you pass an object to System.out.

[hr]

Now that you've done some research, you'll know that if you want to print the field values, you're going to have to do this yourself. One option is to implement AnotherClass#toString(), and in your implementation include the field values in the returned string.

Another is to print the values at the call site:

// in main
Big bigObj = new Big();

AnotherClass another = bigObj.getNumber(5);

System.out.println("Number 5 {");
System.out.println("\tx: " + another.getX());
System.out.println("\ty: " + another.getY());
System.out.println("\tz: " + another.getZ());
System.out.println("}");

This would be a better solution if you have particular formatting requirements at the call site.