The trimToSize() method is an important feature in Java’s ArrayList class that helps optimize memory usage by reducing the internal capacity of the list to match exactly the number of elements it contains. This is especially useful when you have finished adding elements to the list and want to minimize the memory footprint. What Is…
The toArray() method is a powerful and versatile tool in the Java ArrayList class. It enables you to convert a dynamic ArrayList into a traditional array, providing compatibility with APIs and legacy code that expect arrays, as well as efficient bulk data processing. What Is the toArray() Method in ArrayList? Syntax Parameters Parameter Description a…
The subList() method is a powerful feature of the Java ArrayList class. It allows you to extract a portion of a list as a separate, view-backed list, based on a specified range of indices. This provides an efficient way to work with slices of data without creating unnecessary copies, making your code neater and more…
The spliterator() method in Java’s ArrayList class is a modern utility for splitting and traversing elements, ideally suited for parallel and bulk operations. Introduced in Java 8, it enables you to process sequences of elements efficiently—supporting both sequential and parallel traversal—making it a core tool for modern Java stream-based and parallel programming. What Is the…
The sort() method in Java’s ArrayList class is a highly practical feature for ordering elements in a list based on natural order or custom rules. Introduced in Java 8, this method leverages functional programming by accepting a comparator, making sorting operations on dynamic lists much simpler, more flexible, and more expressive. What Is the sort()…
The size() method is a fundamental operation in the Java ArrayList class. It allows you to determine the number of elements currently stored in an ArrayList, making it a crucial tool for iteration, validation, and working with dynamic data collections. What Is the size() Method in ArrayList? Syntax Parameters Return Value Returns Description int The…
The set() method is a fundamental operation in the Java ArrayList class. It allows you to replace an element at a specific position in the list with a new value, making it essential for updating or modifying the contents of an ArrayList without altering its structure. What Is the set() Method in ArrayList? Syntax Where:…
The retainAll() method is a key operation in Java ArrayList class. It enables you to retain only those elements in your list that are also present in a specified collection, removing all others. This method is essential when you want to extract the intersection (common elements) between your list and another collection for filtering or…
The replaceAll() method is a convenient feature of the Java ArrayList class that allows you to transform all elements in a list using a given operation. This functional-style method is especially useful for applying a transformation, calculation, or bulk update to every item in the list without needing explicit loops. It was introduced in Java…
The removeIf() method is a powerful method in the Java ArrayList class that lets you remove all elements that satisfy a specified condition—provided as a functional predicate or lambda expression. This approach is especially useful when you want to filter out multiple elements at once based on a dynamic rule, all in a single, concise…