Which of the following statements is true regarding ArrayList in Java? a. ArrayList is a synchronized data structure, making it thread-safe. b. ArrayList allows duplicate elements and maintains insertion order. c. ArrayList has a fixed size that must be specified at creation and cannot be changed. d. ArrayList can only store primitive data types like int, double, and char.
Question
Which of the following statements is true regarding ArrayList in Java? a. ArrayList is a synchronized data structure, making it thread-safe. b. ArrayList allows duplicate elements and maintains insertion order. c. ArrayList has a fixed size that must be specified at creation and cannot be changed. d. ArrayList can only store primitive data types like int, double, and char.
Solution
The correct statement regarding ArrayList in Java is: b. ArrayList allows duplicate elements and maintains insertion order.
Here's why:
a. ArrayList is not synchronized or thread-safe by default in Java. You would need to explicitly synchronize it if you need to use it in a multi-threaded environment.
b. This statement is true. ArrayList in Java does allow duplicate elements and it also maintains the insertion order, which means you can access the elements in the order they were inserted.
c. ArrayList in Java is dynamic and its size can be changed dynamically. It does not have a fixed size that must be specified at creation.
d. ArrayList in Java can store both primitive data types and objects, but it is commonly used for objects. Primitive data types need to be used with their corresponding wrapper classes (like Integer for int, Double for double, etc.) when being stored in an ArrayList.
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