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In Java, an Iterator is an interface that provides a way to traverse a collection (like a list, set, or map) without exposing the underlying structure of the collection. It allows you to iterate over the elements in a ...
A HashSet in Java is a part of the Java Collections Framework and implements the Set interface. It is used to store a collection of unique elements, meaning that it does not allow duplicate values. The HashSet clas...
In Java, a HashMap is part of the Java Collections Framework and is used to store data in key-value pairs. It implements the Map interface and provides a way to store and retrieve da...
In Java, the List interface is part of the Java Collections Framework and represents an ordered collection (also known as a sequence). The List interface provides various methods to manipulate the elements in the lis...
In Java, a LinkedList is a part of the Java Collections Framework and is implemented as a doubly linked list. It allows for the storage of a sequence of elements, where each element (or node) contains a reference to bo...
In Java, an ArrayList is part of the Java Collections Framework and is a resizable array implementation of the List interface. It allows for dynamic arrays that can grow as needed ...
Java provides a comprehensive set of classes for handling date and time through the java.time package, which was introduced in Java 8. This package is inspired by the Joda-Time library and aims to provide a more intuit...
In Java, the Scanner class is a part of the java.util package and is used to obtain input from various sources, including user input from the console. It provides methods to read different types of data, such as stri...
Java Enums (short for enumerations) are a special Java type used to define collections of constants. They are a powerful feature that allows you to define a fixed set of related constants in a type-safe manner. Enums can...
A Java interface is a reference type, similar to a class, that can contain only constants, method signatures, default methods, static methods, and nested types. Interfaces cannot contain instance fields or constructors. ...
Java abstraction is a fundamental concept in object-oriented programming that allows you to hide the complex implementation details of a system and expose only the necessary parts to the user. This helps in reducing comp...
Java Inner Classes are classes defined within the body of another class. They are a powerful feature of Java that allows for better organization of code and can help in logically grouping classes that are only used in on...
Java polymorphism is a core concept in object-oriented programming that allows methods to do different things based on the object that it is acting upon. It enables a single interface to represent different underlying fo...
Java inheritance is a fundamental concept in object-oriented programming that allows one class (the child or subclass) to inherit the properties and behaviors (fields and methods) of another class (the parent or supercla...
Java packages are a way to group related classes and interfaces together, providing a namespace to avoid naming conflicts and to control access. They help in organizing files within a project and can also be used to mana...
Java encapsulation is one of the four fundamental Object-Oriented Programming (OOP) concepts, alongside inheritance, polymorphism, and abstraction. Encapsulation is the practice of bundling the data (attributes) and meth...
In Java, modifiers are keywords that you can use to change the way classes, methods, and variables behave. They can be broadly categorized into two types: access modifiers and non-access modifiers.
In Java, a constructor is a special method that is called when an object is instantiated. Constructors are used to initialize the object's properties and allocate memory for the object. They have the same name as the cla...
In Java, a class method is a method that belongs to the class rather than to any specific instance of the class. Class methods are defined using the static keyword. This means that you can call these methods without cr...
In Java, class attributes (also known as fields or member variables) are variables that are declared within a class but outside any method. They represent the state or properties of an object created from that class. Cla...
Java is an object-oriented programming language that uses classes and objects as its fundamental building blocks. Understanding classes and objects is essential for writing effective Java programs. A clas...
Java is an object-oriented programming (OOP) language that allows developers to create modular, reusable, and organized code. OOP is based on the concept of "objects," which can represent real-world entities and encapsul...
Recursion is a programming technique where a method calls itself in order to solve a problem. It is often used to solve problems that can be broken down into smaller, similar subproble...
In Java, scope refers to the visibility and lifetime of variables, methods, and other entities within a program. Understanding scope is crucial for managing variable accessibility and avoiding naming conflicts. There...