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Java - util package

1.6K+ posts

How to Add or Update Elements in a HashTable in Java?

Last Updated: 23 July 2025

In Java, HashTable is a pre-defined class of the collection framework. It is a part of the java.util package and is used to store the key-value pairs in the program. In th...read more

How to Merge Two TreeMaps in Java?

Last Updated: 23 July 2025

In Java, TreeMap is a pre-defined class that implements the NavigableMap interface and extends the AbstractMap class. In this article, we will learn to Merge Two Tree Maps...read more

Java.util Package in Java

Last Updated: 23 July 2025

Java.util PackageIt contains the collections framework, legacy collection classes, event model, date and time facilities, internationalization, and miscellaneous utility c...read more

Java

Java - util package

Java-Packages

What is StringUtils.substringsBetween() in Java?

Last Updated: 28 December 2023

The StringUtils.substringsBetween() the method provided by the Apache Commons Lang library is used to extract multiple substrings from the larger string. It returns an arr...read more

Java

Java - util package

STOMP Protocol

Last Updated: 11 September 2023

STOMP is the Simple (or Streaming) Text Orientated Messaging Protocol, formerly known as TTMP. It provides an interoperablewire formatthat allows STOMP clients to talk wit...read more

Java-Stream interface

TreeMap firstEntry() Method in Java with Examples

Last Updated: 25 August 2020

TreeMap firstEntry() refers to the method used to retrieve the key-value pairs mapped with the lowest key value element that exists in the TreeMap, if there are no key-val...read more

Difference between ExecutorService execute() and submit() method in Java

Last Updated: 15 July 2025

The ExecutorService interface extends Executor by adding methods that help manage and control the execution of threads. It is defined in java.util.concurrent package. It d...read more

Java

Difference Between

Java - util package

Java-concurrent-package

HashMap replaceAll(BiFunction) method in Java with Examples

Last Updated: 12 July 2025

The replaceAll(BiFunction) method of HashMap class replaces each value with the result of applying the given function(performs a certain operation) on the corresponding va...read more

BlockingQueue remainingCapacity() method in Java with examples

Last Updated: 12 July 2025

The remainingCapacity() method of BlockingQueue returns the number of more elements that can be added to BlockingQueue without blocking. The Capacity returned arises in th...read more

Java HashMap computeIfPresent() Method

Last Updated: 12 July 2025

In Java, the computeIfPresent() method of the HashMap class is used to compute a new value for a specified key if the key is already present in the map and its value is no...read more

Java HashMap getOrDefault() Method

Last Updated: 12 July 2025

When we work with Java's HashMap, one common problem occurs that is dealing with missing keys. If we try to fetch a value for a key that does not exist, we get "null" and ...read more

BlockingDeque size() method in Java with Examples

Last Updated: 14 October 2019

The size() method of BlockingDeque returns the current size of the Deque container. On calling the function the number of elements in the Deque container is returned. If t...read more

BlockingDeque take() method in Java with Examples

Last Updated: 14 October 2019

The take() method of BlockingDeque returns and removes the head of the Deque container from it. The method throws an InterruptedException if it is interrupted while waitin...read more

BlockingDeque takeFirst() method in Java with Examples

Last Updated: 14 October 2019

The takeFirst() method of BlockingDeque returns and removes the first element of the Deque container from it, waiting if necessary until an element becomes available.. The...read more

BlockingDeque removeLastOccurrence() method in Java with Examples

Last Updated: 14 October 2019

The removeLastOccurrence() method of BlockingDeque removes the last occurrence of the specified element from this deque. If the deque does not contain the element, it rema...read more

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