CS Awesome - Unit 7 Vocabulary

Automatically wrapping a primitive type in a wrapper class object. For instance if you try to add an int value to a list, it will automatically be converted to an Integer object.

A method that only has a declaration and no method body (no code inside the method).

An ArrayList can hold many objects of the same type. It can grow or shrink as needed. You can add and remove items at any index.

You can add an object to the end of a list using listName.add(obj). You can add an object at an index of a list using add(index,obj). This will first move any objects at that index or higher to the right one position to make room for the new object.

To get an object at an index from a list use listName.get(index).

You can access and set values in a list using an index. The first element in a list called list1 is at index 0 list1.get(0). The last element in a list is at the length minus one - list1[list1.size() - 1].

To remove the object at an index use ListName.remove(index). This will move all object past that index to the left one index.

To set the value at an index in a list use listName.set(index,obj).

Use listName.size() to get the number of objects in the list.

Classes used to create objects that hold primitive type values like Integer for int, Double for double and Boolean for boolean.

Automatically converting a wrapper object like an Integer into a primitive type such as an int.