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A global variable is a variable with global scope, meaning it is visible and accessible throughout the program. The collection of all global variables is known as the global environment or global scope of the program. The variables declared outside the function are, by default, global variables. We use the global keyword before a variable inside a function or method to indicate that we are referring to the global variable rather than creating a new local one. The following is the syntax to declare a global variable inside a function ... Read More
The asterisk (*) operator in Python has more than one meaning attached to it. We can use it as a multiplication operator, a repetition operator, for unpacking the iterables, and as a function *args. A single asterisk, as used in a function declaration, allows a variable number of arguments to be passed from the calling environment. Inside the function, it behaves as a tuple. As the multiplication operator Generally, the start (*) operator is used for multiplication purposes. For numeric data, the asterisk (*) is used as a multiplication operator. Let’s take an example and see how the star operator works ... Read More
In this article, we will learn to add/insert a JCheckBox inside a JTable cell in Java. JTable is a powerful component for displaying and editing data in tables. A frequent requirement is to add checkboxes to table cells for boolean data or selection. JTable A JTable is a subclass of the JComponent class, and it can be used to create a table with information displayed in multiple rows and columns. Syntax The following is the syntax for JTable initialization: JTable table = new JTable(); When a value is selected from a JTable, a TableModelEvent is generated, which is handled by ... Read More
In this article, we will learn to implement the HTML text of a JButton in Java. The Swing JButton component has a useful feature in which developers can use HTML to style button labels. This feature enables us to make buttons appear more appealing by using simple HTML elements in our Java applications. What is a JButton? A JButton is a subclass of AbstractButton, and it is an important component in the Java Swing hierarchy. A JButton can be used mostly in login-based applications. Syntax The following is the syntax for JButton initialization: JButton button = new JButton("Button"); A JButton ... Read More
In this article, we will learn to disable the cut, copy, and paste functionality of a JTextArea in Java. While developing Java Swing applications, you may need a situation where you want to restrict user input to text components. Cutting, copying, and pasting is usually needed to be disabled for a JTextArea such that users are not allowed to modify or copy its content. What is a JTextArea? A JTextArea is a subclass of the JTextComponent class, and it is a multi-line text component to display text or allow a user to enter text. A JTextArea can generate a CaretListener interface ... Read More
Let's understand the title: converting a string to a Python class means accessing a Python class using its name stored as a string, allowing dynamic creation of objects at runtime. In this article, we will discuss different ways to convert a string to a Python class object. Using globals() Function The globals() function is used to convert a string to a Python class object when a class is in global scope. class Bike: def start(self): print("Bike started!") class_name = "Bike" cls = globals()[class_name] # Convert string to class obj ... Read More
In Python, inheritance is the capability of one class to derive or inherit the properties from another class. The class that derives properties is called the derived class or child class, and the class from which the properties are being derived is called the base class or parent class. In other words, inheritance refers to defining a new class with little or no modification to an existing class. Following is the syntax of the inheritance - class A: #class A (base class) pass class ... Read More
In Python, strings can be defined using single quotes ('), double quotes ("), or triple quotes (''' or """). For example, 'Hello' is a valid string. There are different types of quotes in Python. Each quotation is used in different scenarios as per the requirement. The following are the different types of quotations that we can use in the Python programming language. Single quotes Double quotes ... Read More
In this problem, we are given an array of integers. In the given array, each element occurs two times except one element, which occurs only once. We have to find the number that appears only once. In this article, we are going to learn how we can find the number that appears once, and all other numbers appear twice in Java. Scenario 1 All other numbers except 4 occur twice, so 4 is the only number that appears only once. Input: [ 1, 2, 3, 3, 2, 4, 1, 5, 5] Output: 4 Scenario 2 All other numbers except ... Read More
Rotating an array means shifting the elements of an array in a specific direction while maintaining their relative order. For example, if the array {6, 12, 18, 24, 30} is rotating it left once will result in {12, 18, 24, 30, 6}. In this article, we are given an array and need to shift all elements one step to the left, with the first element moving to the last position. Example Here is an example of left rotation of elements in array by one place. Input: array = {5, 10, 15, 20, 25} Output: array = {10, 15, ... Read More