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Temporary files are created to store data temporarily during the execution of a program or while working with large amount of data. To create a temporary file we can use the tempfile module, as it creates unique names and stores in platform-dependent default location . Specifically the tempfile module is used as the files created using this module are deleted as soon as they are closed. Creating a Temporary File A temporary file is created using the TemporaryFile() function of the tempfile module. This by default opens the file in 'w+b' mode, which allows to both read and write the ... 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
A Linked list is a linear type of data structure that is used to store a group of elements. It is a part of the Java Collections Framework. A LinkedList is made up of nodes, where each node contains a data field and a reference to the next node in the sequence. In this article, we will learn how to find an element in a LinkedList in Java. Ways to Find an Element in a LinkedList There are various ways to find an element in a LinkedList in Java. They are - Using the contains() ... 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
List Iterators in Java are mainly useful for traversing a list in both directions (forward and backward). They allow you to iterate through the elements of a list while providing methods to modify the list during iteration. In this article, we will learn how to create or make a list iterator in Java. Ways to Create a List Iterator in Java Using ListIterator Interface Using the Iterator Interface Using Stream API Using ListIterator Interface We can utilize listIterator() method of the List interface, which allows element ... Read More
A list is an ordered collection that holds a sequence of elements. In Java, a list is represented by the List Interface of the java.util package. This provides various methods to maintain and manipulate the list.To create a list, you need to instantiate any of the implementing classes of this interface, suchas, ArrayList, LinkedList, Stack, Vector, etc. We can create a List of elements in multiple ways - Without specifying the type Using ArrayList Let's explore these methods in detail. Without specifying the "type" We can create a List without specifying ... 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