Chapter 18: Problem 9

What class does the ArrayList class extend?

Short Answer

Expert verified

Answer: The parent class of the ArrayList class in Java is the AbstractList class.

Step by step solution

Understand Java Collections Framework hierarchy

The ArrayList class is a part of the Java Collections Framework, which provides a well-organized hierarchy of interfaces and classes to store and manage data effectively. The main interfaces and classes in this hierarchy are: - Collection interface (java.util.Collection) - List interface (java.util.List) - Set interface (java.util.Set) - Map interface (java.util.Map) - ArrayList class (java.util.ArrayList)

Identify the parent class of ArrayList

ArrayList is a class available in java.util package that implements the List interface. To identify the parent class of ArrayList, we can look at its class hierarchy: - Object (java.lang.Object) => parent of all classes in Java - AbstractCollection (java.util.AbstractCollection) => extends Object and implements Collection - AbstractList (java.util.AbstractList) => extends AbstractCollection and implements List - ArrayList (java.util.ArrayList) => extends AbstractList and implements List, RandomAccess, Cloneable, Serializable Looking at the hierarchy shown above, we identify that the ArrayList class extends the AbstractList class.

Conclusion

The ArrayList class extends the AbstractList class in Java.

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What class does the ArrayList class extend?

Short Answer

Step by step solution

Understand Java Collections Framework hierarchy

Identify the parent class of ArrayList

Conclusion

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