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ArrayList is a class of Java Collection Framework that implements List Interface. It is a linear structure that stores and accesses each object in a sequential manner. It allows the storage of duplicate values. Always remember, each class of the collection framework can hold instances of wrapper classes or custom objects. They do not work with primitives. This article aims to explain how those objects hold by an ArrayList in Java. How ArrayList holds Objects ArrayList internally uses an array to store its elements. However, the size of the array is not fixed, it can increase and decrease as per ... Read More
Converting a Pandas DataFrame into a list is a common task in data analysis and manipulation using Python. The Pandas library provides powerful data structures and functionalities for handling tabular data, but there are situations where it becomes necessary to transform the DataFrame into a list format. By converting a DataFrame into a list, we gain flexibility in performing various operations or working with other Python data structures. In this article, we will explore different methods to convert a Pandas DataFrame into a list. We will discuss simple approaches like using the values attribute or the to_dict() method, as well ... Read More
IPython notebooks are a highly popular tool for scientific computing and data analysis, widely used by researchers, analysts, and programmers. By allowing users to integrate code, text, and interactive visualizations within a single document, they make it simple to explore data, develop models, and communicate findings. However, sharing IPython notebooks with others can be difficult, particularly when the recipients lack the necessary software or expertise to run them. A solution to this challenge is to convert IPython notebooks to PDF and HTML, which are universally supported and easily accessible on any device. In this article, we will delve into three ... Read More
Fractions and percentages are two fundamental mathematical concepts used in various fields such as finance, data analysis, and statistics. Converting fractions to percentages is a simple yet essential operation that allows us to represent fractional values in a more comprehensible manner. Python, being one of the most popular programming languages, provides several methods to convert fractions to percentages, and comprehending them is crucial for those working with data in Python. This article delves into the process of converting fractions to percentages in Python. We will explore different approaches to perform this operation and provide examples to help you understand each ... Read More
In Java, concurrent programming is a technique that allows multiple tasks or processes to run simultaneously on a single processor or multiple processors. It can improve the performance and responsiveness of applications. However, it also introduces new challenges and complexities to the Java developers, such as synchronization and deadlock. In this article, we will explore some of the different approaches to concurrent programming such as multithreading and executors. Concurrent Programming in Java The following three components of Java are used for Concurrent Programming java.lang.Thread clas java.lang.Runnable java.util.concurrent Multithreading It is a feature of the Java programming language that ... Read More
The most frequent query asked by beginner programmers, especially those who have already worked with C and C++ in the past, is whether Java supports pass-by-referenceor pass-by-value. Generally, programming languages use pass-by-value and pass-byreferencefor passing parameters to a method. However, Java does not support both approaches rather it uses pass-by-value to pass both primitive and reference type values. But, it provides a few ways to achieve pass-by-reference, we will explore those through this article. Ways to Achieve Paas By Reference Let’s start this discussion by understanding the storage mechanism of Java. The reference variables, names of methods and classes are ... Read More
The Java filter() method allows us to strain elements of the stream based on the specified condition. It is a part of higher-order function that is used to apply a certain behavior on stream items. This method takes a predicate as an argument and returns a list of elements that match the predicate. But the question arises here is that how this filter() method works in the background. This article aims to explain this question through some example programs. Working of filter() method in Background Before going deep into the filter() method, let’s familiarize ourselves with I/O Streams. Itis an ... Read More
The manipulation of date and time values is a crucial aspect of programming, and the Python language provides a useful built−in module called datetime for this purpose. However, in certain situations, it may be necessary to convert a DateTime object into an integer value in order to perform specific operations or calculations. There are various approaches to converting DateTime to an integer in Python, each with its own set of advantages and disadvantages. In this article, we will delve into these methods and examine when each one is appropriate to use. By the end of this article, you will have ... Read More
Python has become one of the most popular programming languages in the world, renowned for its simplicity, versatility, and vast ecosystem of libraries and frameworks. Alongside Python, there is PySpark, a powerful tool for big data processing that harnesses the distributed computing capabilities of Apache Spark. By combining the ease of Python with the scalability of Spark, developers can tackle large−scale data analysis and processing tasks efficiently. In this tutorial, we will explore the process of converting a list of dictionaries into a PySpark DataFrame, a fundamental data structure that enables efficient data manipulation and analysis in PySpark. In the ... Read More
Django is a fantastic web framework that has gained popularity among developers for its capability to create powerful web applications swiftly and with ease. One of its notable strengths is the flexibility to integrate with various third−party libraries and tools. In this article, we'll explore how to transform model data into JSON format utilizing Django. JSON, also known as JavaScript Object Notation, is a user−friendly data format that simplifies the exchange of data between servers and clients. It's a favorite among developers because of its uncomplicated structure and versatility. JSON can be read and written with ease, and several programming ... Read More