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The import statement is used to bring certain classes and interfaces from other packages into our Java program, so we can access them without using their fully qualified names. We can use the short name instead. Java also supports static import statements, which were introduced in Java 5. It helps in accessing static members such as methods and constants. In this article, we are going to learn the difference between import and static import statements in Java. The import Statement in Java To access a class or method from another package, we need to either use the fully qualified ... Read More
A Type casting in Java is used to convert objects or variables from one data type to another. When we are converting or assigning one data type to another, automatic conversion will take place (if the types are compatible and the conversion is safe). However, if there is a risk of data loss, the conversion must be done explicitly by the programmer. Let's understand the types of Java type casting and the difference between them in this article. Types of Type Casting in Java Java Type Casting is classified into two types, which are: ... Read More
The NullPointerException is a subclass of the RuntimeException class. It is defined in java.lang package of Java. In this article, we are going to understand the reasons for NullPointerException and how to resolve them. Reason for NullPointerException in Java A NullPointerException is a runtime exception thrown by the JVM when our application code, another referenced API, or the middleware encounters the following conditions: Attempting to invoke an instance method of a null object. ... Read More
The article will discuss different ways to remove elements from an ArrayList. Below is a list of methods that can help in removing elements from an ArrayList: Using the remove() Method of List Interface Using the remove(object) Method Using the clear() Method Using the removeAll() Method Removing a Single Element using the remove() Method The remove() method of the List interface accepts an integer value representing an index as a parameter and removes an element at the specified index. Following is the ... Read More
In Python, objects are instances of classes containing attributes and methods, while dictionaries are collections of key-value pairs. We can obtain a dictionary from an object's fields - Using __dict__ Using vars() Using __dict__ You can access an object's attributes as a dictionary using its _dict_ attribute. In Python, every object has a _dict_ attribute that stores the object's attributes and their values as a dictionary (key-value pairs). Example In this example, we have defined a class Company with attributes Companyname and Location, and created ... Read More
The absolute value of a number is its non-negative representation. It specifies the distance of that number from zero on a number line, irrespective of its direction.For example, the absolute value of -2 is 2, and 2 is simply 2. In this article, we will explore how to calculate the absolute value of a number in Python. Calculating Absolute Value in Python The following methods can be efficiently used to calculate the absolute value of a number. Using User-Defined Function (Brute Method) Using abs() function ... Read More
In Python, dictionaries are used to store data as key-value pairs, and lists store a collection of items separated by commas. To map two lists into a dictionary, we have various methods in Python that we will explore in this article. Mapping two lists into a Dictionary Mapping two lists into a dictionary can be done using the following methods - Using a Loop Using a Zip and Dict Method Using Dictionary Comprehension Using a Loop For loops are used to iterate ... Read More
In Python, a list is a mutable data type used to store a collection of items, which are separated by commas and enclosed within square brackets [ ]. According to the Python documentation, there is no concept of a homogeneous list in Python. However, a Python list can contain collections of homogeneous items, meaning that the data types of the items are the same. Python List of Homogeneous Data A Python list can contain both homogeneous and heterogeneous data. Example Here is an example of a list containing homogeneous data - # List containing ... Read More
In Java, org.simple.json and org.json are two libraries that help in reading, writing, and manipulating JSON. But still, they are different. In this article, we are going to learn about these differences. Difference between JSON.simple vs JSON Let's see the below differences and they are - Features JSON.simple JSON ... Read More
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 to denote a particular field that is declared in Java as an instance variable, is a JsonProperty, and should be ignored. We can also use annotations with methods. So, basically, Annotations make JSON output clearer as we required. In this Article, we will learn about one of its annotations is @JsonRawValue Annotation. @JsonRawValue This annotation can be used for methods and fields. The @JsonRawValue annotation is used to serialize methods or fields as it ... Read More