javautilArrayList
javautilArrayList refers to the Java class java.util.ArrayList, a widely used resizable-array implementation of the List interface in the Java Collections Framework. It stores elements in an internal array and automatically grows the array as new elements are added, providing efficient random access by index and preserving insertion order. By default, ArrayList is not synchronized, so it is generally not thread-safe without external synchronization.
Key characteristics include the ability to store nulls and duplicate elements, fast get and set operations,
Common constructors and usage: a no-argument constructor creates an empty list with a default initial capacity,
Practical guidance: use ArrayList when you need fast indexed access and you perform more reads than inserts/removals.