Java Arrays and ArrayLists Glossary

An array of arrays, used to represent grid or tabular data, accessed with two indices (row and column).

A fixed-size, ordered collection of elements of the same type, accessed by zero-based integer index.

A runtime exception thrown when code attempts to access an array index that is negative or greater than or equal to the array's length.

A resizable collection from java.util that stores objects and provides methods like add(), get(), set(), remove(), and size().

Automatic conversion of a primitive type to its corresponding wrapper class (e.g., int to Integer).

A simplified loop syntax (for-each) that iterates over every element in an array or collection without using an index.

An integer position used to access elements in an array or ArrayList, starting from 0.

A search algorithm that checks each element sequentially until the target is found or the end of the collection is reached.

A 2D array where rows can have different numbers of columns, since each row is an independent array.

The process of visiting every element in a data structure, typically using a loop.

Automatic conversion of a wrapper class object to its corresponding primitive type (e.g., Integer to int).

An object type that wraps a primitive value (Integer for int, Double for double, Boolean for boolean) for use in generic collections.