Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
In Java, a list is a collection that we use for storing elements. In many cases, we need to get the length of a list of lists. In this article, we will learn how to get the length of a list of lists in Java. List provides a method size() to get the count of elements present in the current list. To get the size of each list, we can iterate through each item in the list and add its size to get the count of all elements present in the list of lists. Ways to Get the Length of ... Read More
A List is a Collection in Java that is used for storing elements in sequence. In this article, we will be learning how to create a list with values in Java. Ways to Create a List with Values in Java There are various ways to create a list with values in Java. Below are the different approaches: Using Arrays.asList() method Using Stream.of() method Using List.of() method Using Arrays.asList() method The Arrays.asList() method returns the elements of the current array in the form of a List. This method ... Read More
In Python, duplicates of an existing file are created as backups to manipulate data and to preserve original version. To create a duplicate file of an existing file using Python we can use the shutil module or pathlib module, which we will discuss in detail with examples. Here are the various approaches for this: Creating Duplicate File of an Existing File Using shutil Module Creating Duplicate File of an Existing File Using open() Function Creating Duplicate File of an Existing File Using pathlib Creating Duplicate File ... Read More
Catalan numbers are defined as a sequence of natural numbers that can be used to find the number of possibilities of various combinations. The below formula is used to calculate catalan number using the binomial coefficient ( denoted as (nk) and represents the number of ways to choose k items from n )- For example, if the input parameter n is given 6, the output would be 142, that is calculated using the above formula in the following way: C(6)=C(0)C(5) + C(1)C(4) + C(2)C(3) + C(3)C(2) + C(4)C(1) + C(5)C(0) Following are the two main methods used to calculate the ... Read More
In this article, we will discuss different methods used to right rotate a list from the given rotation number. A list has comma-separated values (items) of same type or different type between square brackets. To right rotate a list by n, Python offers many ways such as using slicing, rotate() method of the deque object and others. Let's discuss these ways in detail with examples - myList = [5, 20, 34, 67, 89, 94, 98, 110] The following is the output if we assign n as 4 − 89, 94, 98, 110, 5, 20, 34, 67 Right ... Read More
Java constructor is a special method used to initialize objects. It has the same name as the class and is automatically called when an object is created. You can also declare a constructor as private to restrict object creation from outside the class. What is a Private Constructor? A private constructor is a constructor that is declared using the private access modifier. It restricts object creation from outside the class i.e., the class having a private constructor cannot be subclassed. Private constructors are used in design patterns like Singleton, or to prevent subclassing or instantiation. Purpose of a Private ... Read More
List is a collection in Java that allows us to store elements. In this article, we will learn how to get the index of an element in a List in Java. We have various ways to get the index of an element in a List in Java. They are - Using the indexOf() method Using a for loop Using Stream API Using the indexOf() method The indexOf() method returns the index of the first occurrence of the specified element in this list, or -1 if this ... Read More
A method is a collection of statements that are grouped together to perform an operation. In Java, you can define a method having the same name as the class but it is not recommended as per the coding standard. Can We define a Method Having Same as Class? Yes, It is allowed to define a method with the same name as that of a class. There is no compile-time or runtime error will occur. But this is not recommended as per coding standards in Java. Normally the constructor name and class name always the same in Java. Example of a ... Read More
In this article, we will learn to reverse a string using recursion in Java. Recursion is the process of repeating items in a self-similar way. In programming languages, if a program allows you to call a function inside the same function, then it is known as a recursive call of the function. You can reverse a string using the recursive function as shown in the following program. Steps to reverse a string using recursion Following are the steps to reverse a string using recursion - Create a class called StringReverse with a method reverseString that takes ... Read More
In this article, we will understand how to implement multiple inheritance. Unlike other programming languages, such as C++, Java does not support multiple inheritance through classes. This means that a class cannot inherit from more than one class. But why? Let's understand first what multiple inheritance is and why it is so. Multiple Inheritance Multiple Inheritance is one of the features of object-oriented programming, where a class (child class) can inherit properties of more than one class (parent class) using the extends keyword. But Java does not support this to avoid complexity and ambiguity. It can ... Read More