The search(Object o) method in Java, part of the java.util.Stack class, is used to search for an object in the stack and return its 1-based position from the top of the stack. This method is useful for finding the position of an element within the stack.
The push(E item) method in Java, part of the java.util.Stack class, is used to push an item onto the top of the stack. This method is fundamental to the stack’s LIFO (Last-In-First-Out) behavior.
The pop() method in Java, part of the java.util.Stack class, is used to remove the element at the top of the stack and return that element. This method is fundamental to the stack’s LIFO (Last-In-First-Out) behavior.
The peek() method in Java, part of the java.util.Stack class, is used to view the element at the top of the stack without removing it. This method is useful when you need to inspect the top element without modifying the stack.
The empty() method in Java, part of the java.util.Stack class, is used to check whether a stack is empty. This method is useful for determining if there are any elements left in the stack.
Introduction The WeakHashMap class in Java, part of the java.util package, is a hash table-based implementation of the Map interface with weak keys. Entries in a WeakHashMap are automatically removed when their keys are no longer in ordinary use, which allows for better memory management and helps avoid memory leaks in certain scenarios.
Introduction The UUID class in Java, part of the java.util package, is used to generate and manipulate Universally Unique Identifiers (UUIDs). A UUID is a 128-bit value used for uniquely identifying information in distributed systems without significant central coordination. The UUID class provides methods to create, convert, and work with UUIDs.
Introduction The StringTokenizer class in Java, part of the java.util package, is a legacy class used to break a string into tokens. It is a simple and fast way to tokenize a string, splitting it into smaller parts based on delimiters. Although it is a legacy class, it is still widely used for simple tokenization …
Introduction The StringJoiner class in Java, part of the java.util package, is used to construct a sequence of characters separated by a delimiter and optionally starting with a supplied prefix and ending with a supplied suffix. It was introduced in Java 8 as a utility to make it easier to create delimited strings, particularly useful …
Introduction The Stack class in Java, part of the java.util package, represents a last-in-first-out (LIFO) stack of objects. It extends the Vector class with five operations that allow a vector to be treated as a stack. The Stack class provides methods to push and pop elements, as well as to peek at the top element, …
Introduction The Spliterator interface in Java, part of the java.util package, is used to traverse and partition elements of a source. It is designed to be used in parallel processing and provides a more efficient way to process elements compared to the traditional iterator. The name Spliterator is a combination of "split" and "iterator," emphasizing …
Introduction The SortedSet interface in Java, part of the java.util package, represents a set that maintains its elements in ascending order. This interface extends the Set interface and provides methods for navigation and retrieving subsets. The most commonly used implementation of SortedSet is TreeSet.
Introduction The SortedMap interface in Java, part of the java.util package, is a specialized map that maintains its entries in ascending key order. This interface extends the Map interface and adds methods that provide navigation and sorted views of the map. The most commonly used implementation of SortedMap is TreeMap.
Introduction The Set interface in Java, part of the java.util package, is a collection that does not allow duplicate elements. It models the mathematical set abstraction, providing operations to add, remove, and query elements. Common implementations include HashSet, LinkedHashSet, and TreeSet.
Introduction The SequencedSet interface in Java, introduced in Java 21, is part of the java.util package. It extends the Set interface and provides methods to access elements in a sequence, focusing on maintaining and accessing elements in a specific order, such as insertion order.
Introduction The SequencedMap interface in Java, introduced in Java 21, is part of the java.util package. It extends the Map interface and provides methods to access elements in a sequence, focusing on maintaining and accessing elements in a specific order, such as insertion order.
Introduction The SequencedCollection interface in Java, introduced in Java 21, is part of the java.util package. It extends the Collection interface and provides methods to access elements in a sequence, specifically focusing on maintaining and accessing elements in a specific order, such as insertion order.
Introduction The Scanner class in Java, part of the java.util package, is a utility class used to parse primitive types and strings using regular expressions. It can read input from various sources, including strings, files, and input streams. The Scanner class is widely used for reading user input in console applications.
Introduction The Queue interface in Java, part of the java.util package, represents a collection designed for holding elements prior to processing. It follows a first-in, first-out (FIFO) principle, though other types of ordering are possible depending on the implementation. Common implementations include LinkedList, PriorityQueue, and ArrayDeque.
Introduction The Properties class in Java, part of the java.util package, is a subclass of Hashtable that is used to maintain lists of values in which the key and the value are both String. It is typically used to manage application configuration settings, where key-value pairs represent configuration properties.
Introduction The PriorityQueue class in Java, part of the java.util package, is a queue that allows elements to be processed based on their priority. It is a priority heap-based data structure that orders elements according to their natural ordering or by a specified comparator. Elements of the PriorityQueue are ordered in a way that the …
Introduction The OptionalLong class in Java, part of the java.util package, is a container object which may or may not contain a primitive long value. It is designed to handle optional primitive long values gracefully, avoiding NullPointerException and providing a more functional approach to dealing with optional values.
Introduction The OptionalInt class in Java, part of the java.util package, is a container object which may or may not contain a primitive int value. It is designed to handle optional primitive int values gracefully, avoiding NullPointerException and providing a more functional approach to dealing with optional values.
Introduction The OptionalDouble class in Java, part of the java.util package, is a container object which may or may not contain a double value. It is designed to handle optional primitive double values gracefully, avoiding NullPointerException and providing a more functional approach to dealing with optional values.
Introduction The Optional class was introduced in Java 8 as part of the java.util package. It is a container object that may or may not contain a non-null value. This class is designed to handle optional values gracefully, avoiding NullPointerException and providing a more functional approach to dealing with null values. Instead of directly using …