Матеріали курсу FIT2099 Object oriented design and implementation - S1 2026 та відповіді на тести | learning.monash.edu

According to the Week 3 Java Collections reading, why is it highly recommended to declare a dynamic list variable using the List abstraction, for example:

List<String> words = new ArrayList<>();

Rather than explicitly declaring it as the concrete class, for example:

ArrayList<String> words = new ArrayList<>();

It is not possible to use a concrete class when declaring the type of a variable, e.g., ArrayList<String> words = new ArrayList<>(); will throw an error, so the abstraction must be used.

None of the options is correct.

It gives flexibility, allowing the developer to easily replace the currently used collection with other concrete classes that implement the List abstraction.

100%

It is a strict memory requirement to prevent the ArrayList from throwing a NullPointerException.

It prevents the collection from accidentally accepting duplicate elements or null values.

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FIT2099 Object oriented design and implementation - S1 2026

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