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In Java, Jackson is a library that is used to convert JSON to Java objects and vice versa. Jackson Annotations are used during serialization and deserialization. We use annotations with a particular field or method that is declared in Java. So, Annotations make the JSON output clearer as we required. In this Article, we will learn about one of its annotations @JsonRootName. @JsonRootName Annotatation The @JsonRootName annotation is a Jackson annotation that is used on a class if we want to do wrapping in our JSON attributes. It is a class-level annotation. It wraps the object to be serialized with a ... Read More
In this article, we are going to learn how to replace the last occurrence of an expression in a string. In Python, String manipulation is a common task, and Python provides the built-in method named replace(). Though we can replace the specified character or substring in a string using this method, it does not directly support replacing the last occurrence. To achieve this we need to use slicing or a regular expression. Using Python rfind() Method The first approach is by using the Python rfind() method searches for the starting index of the last occurrence of the specified substring. Here, we ... Read More
A copy constructor is a type of constructor that uses another object from the same class that has been created previously, to initialize an object, whereas the assignment operator is used to assign a value to a variable. In this article, we will understand the difference between the copy constructor and the assignment operator in C++. Copy Constructor A copy constructor creates a new object by copying an existing object of the same class which has been created previously. It is of two types, i.e., Default and User-defined copy constructor. In the default copy constructor, ... Read More
The is a header file that includes all the standard C++ library. It is used during coding contests, as it helps in saving time while solving the problem since programmers do not have to remember all the header files. In the software engineering approach, we should reduce the use of this header file, as it includes lots of files, and sometimes that may not be required in the program. So it may increase the compile time. In this article, we are going to discuss why we should not use the header file ... Read More
In this article, we are going to learn about converting a string to binary, which means representing each character in the string using the binary digits 0 and 1. A binary number is a number expressed in the base2 numerical system, which uses only two symbols - 0 and 1. Since computers store data as binary, converting the strings into binary helps to understand how data is stored or transmitted. Python provides several methods to achieve this. Using Python ord() and format() Functions The first approach is by using the Python ord() and format(), Where the Python ord() ... Read More
Sorting the string that contains the number, such as ("xy1", "xy2", "xy10"), can be complex in Python. For example, if we sort the list ["xy1", "xy2", "xy10"] using the built-in sort() method, it results in ["xy1", "xy10", "xy2"]. But we will expect "xy2" to come before "xy10". It is because the Python default sorting uses the lexicographical order and compares the characters from left to right based on their Unicode values. Since the character '1' in "xy10" comes before "2" in "xy2", the "xy10" is treated as smaller, even though the number 10 is greater than 2. This ... Read More
In Python, we will come across situations where we encounter long lines of code that exceed the recommended line length of 79 characters (suggested by the Python style guide). To improve code readability, Python provides several ways to wrap long lines. In this article, we will explore the various methods to wrap long lines in Python. Using Backslash(\) The Backslash(\) is used as the line continuation character in Python. It indicates the compiler that the statement continues on the next line. If we try to place anything (word, space or comment) after the backslash, it will result in ... Read More
A string is a collection of characters that can represent a single word or a whole sentence. Unlike Java, there is no need to declare Python strings explicitly; we can directly assign a string value to a literal. While working with the string, we will encounter situations to check whether the string starts with a capital letter. This can be useful for validating the names or sentences to ensure they follow certain formatting rules. Python provides multiple methods to test this condition. In this article, we will explore how to test if a string with a capital letter. ... Read More
Concatenation is nothing but the process of joining two or more strings together. In Python, if one value is a number (integer or float), we can't directly concatenate it with a string using the '+' operator, as it raises a TypeError. Python does not allow the implicit conversion between strings and numbers during the concatenation. So, we need to explicitly convert the numbers to a string. Using Python str() Function The Python str() function is used to convert the given value into a string. In this approach, we are going to apply the str() function to ... Read More
While working with the texts in Python, we will find the strings that contain a mix of characters such as letters, digits, and white-space. In some scenarios, we may need to extract only the numeric digits from such strings. For achieving this, Python provides various ways. Let's explore one by one - Using Python str.isdigit() Method The first approach is by using the Python isdigit() method. It is used to check whether the character is a digit. It returns true if all the characters in the input string are digits. Syntax Following is the syntax for Python str.isdigit() ... Read More