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In Python, everything is an object. And every object has attributes and methods, or functions. Attributes are described by data variables, for example like name, age, height, etc.Properties Properties are a special kind of attributes that have getter, setter, and delete methods like __get__, __set__, and __delete__ methods. A property decorator in Python provides getter/setter access to an attribute. You can define getters, setters, and delete methods with the property function. If you just want the read property, there is also a @property decorator you can add above your method. Example This example shows how to use the @property decorator ... Read More
In Python, documenting your functions is an important step that helps others understand what your code does, what inputs it expects, and what it returns. Python provides a built-in way to write documentation using docstrings. By producing good documentation, you can make your code more readable and usable in larger projects or by external users. Using Docstrings A docstring is a string that appears just after the definition of a function. It describes what the function does, its parameters, and its return value. You write it using triple quotes (""" or '''). Syntax Following is the syntax for writing a ... Read More
In this article, we will learn about the difference between static and final keywords in Java. Two of the most frequently used and frequently confused keywords are static and final. Although they may at times be used together in code, they have basically different functions. Static The static keyword can be applied to nested static classes, variables, methods, and blocks. It is not required to initialize the static variable when it is declared. This variable can be re-initialized. It can access the static members of the class only, and it can be called only by other static methods. Objects of ... Read More
In this article, we will learn to detect an event when the mouse moves over any component in Java. While building applications with Swing, detecting when the mouse enters or exits a component enables you to create responsive UIs with visual feedback. MouseListener We can implement a MouseListener interface when the mouse is stable while handling the mouse event. A MouseEvent is fired when we can press, release, or click (press followed by release) a mouse button (left or right button) at the source object or position the mouse pointer at (enter) and away (exit) from the source object. ... Read More
In this article, we will learn set the foreground and background color to JComboBox items in Java. Setting basic foreground and background colors for the combo box helps to create interactive Swing-based applications. JComboBox A JComboBox is a subclass of the JComponent class, and it is a combination of a text field and a drop-down list from which the user can choose a value. A JComboBox can generate the ActionListener, ChangeListener, and ItemListener interfaces when the user actions with a combo box. setForeground() Method The setForeground() method can be used to set the foreground color of JComboBox items in ... Read More
When working with JTables in Java Swing, there are many cases where one might need to display data that shouldn't be modified by users. In this article, we will learn to disable the cell editing inside a JTable in Java. JTable A JTable is a subclass of JComponent for displaying complex data structures. A JTable can follow the Model View Controller (MVC) design pattern to display the data in rows and columns. A JTable can fire TableModelListener, TableColumnModelListener, ListSelectionListener, CellEditorListener, and RowSorterListener interfaces. editCellAt() Method The editCellAt() method is used to prevent the JTable from editing a particular ... Read More
While using JTables in Java Swing, you may have cases where you would require displaying or hiding the column headers dynamically. In this article, we will learn how to show/hide the table header of a JTable in Java. JTable A JTable is a subclass of the JComponent class for displaying complex data structures. A JTable can follow the Model View Controller (MVC) design pattern to display the data in rows and columns. DefaultTableModel The DefaultTableModel class is a subclass of AbstractTableModel, and it can be used to add rows and columns to a JTable dynamically. The DefaultTableCellRenderer class can ... Read More
The negate function in C++, is a function object (functor) that returns the negation of a the given value. In this article, we will learn how to use the negate function from the Standard Template Library (STL) in C++. What is negate? The negate function is a predefined function object defined in the STL that performs arithmetic negation. It takes a single value and returns its negative value. For example, if the input is 5, the output will be -5. This operation is useful when we want to apply negation inside STL algorithms like transform() or for_each() without writing ... Read More
Bitwise XOR (exclusive or) "^" is an operator in Java that provides the answer '1' if both of the bits in its operands are different; if both of the bits are the same, then the XOR operator gives the result '0'. XOR is a binary operator that is evaluated from left to right. The operator "^" is undefined for the argument of type String. Importance of the XOR (^) Operator in Java In Java, the XOR (^) operator is important for both bitwise and boolean operations. It returns true or 1 only when the two operands "differ". XOR is commonly ... Read More
Yes, the finally block will be executed even after a return statement within a try or catch block in a Java method. Finally Block after the Return Statement Usually, the return statement will be the last in a Java method. If you try to add any statements after the return in Java, an error will be generated. public class Sample { public String demoMethod() { System.out.println(); return null; System.out.println("This statement will generate an error"); } ... Read More