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Programming Articles
Page 1622 of 2547
How can we catch a double click and enter key events for a JList in Java?
In this article, we will learn to catch a double click and enter key events for a JList in Java. We will be using Java Swing to detect double click and Enter key events on a JList. When we double click an item in the list or press "Enter" key after selecting an item, the selected item is displayed. What is a JList? A JList can extend the JComponent class, which allows us to choose either a single or multiple selections. A JList can generate a ListSelectionListener interface, and it includes one abstract method, valueChanged(). Below is the graphical representation ...
Read MoreHow can we implement the paintComponent() method of a JPanel in Java?
In this article, we will learn to implement the paintComponent() method of a JPanel in Java. In Swing, custom rendering of components is achieved by overriding the paintComponent() method. What is a JPanel? A JPanel is a lightweight container and it is an invisible component in Java. A JPanel's default layout is FlowLayout. After the JPanel has been created, other components can be added to the JPanel object by calling its add() method inherited from the Container class. What is a paintComponent() Method? The paintComponent() method is needed to draw something on a JPanel other than drawing the background color. This ...
Read MoreHow can we implement a splash screen using JWindow in Java?
JWindow is a Swing component that is used to create a splash screen easily as splash screen as it displays a screen without a title bar or window management buttons. In this article, we will learn to implement a splash screen using JWindow in Java. What is a JWindow? A JWindow is a container that can be displayed anywhere on the user's desktop. It does not have the title bar, window management buttons, etc, like a JFrame. The JWindow contains a JRootPane as its only child class. The contentPane can be the parent of any children of the JWindow. Like a ...
Read MoreJava Program to Print the Multiplication Table in Triangular Form
In this article, we will understand how to print a multiplication table in triangular form. To print in triangular form, the table will display row and column-wise. And in every row, entries will be up to the same column number. Below is a demonstration of the same - Input : rows = 7 Output: 1 2 4 3 6 9 4 8 12 16 5 10 15 20 25 6 12 18 24 30 36 7 14 21 28 35 42 49 Multiplication Table in a Triangular Shape Multiplication table in triangular form is achieved using a nested ...
Read MoreJava Program to Display Factors of a Number
In this article, we will understand how to display the factors of a number. Factors are numbers that divide the original number without leaving a remainder. For example, 1, 2, 3, 4, 6, and 12 are factors of 12. If a and b are factors of a number, then a x b is also a factor of the number. If we multiply 3 and 5, we get 15. We say that 3 and 5 are factors of 15. The largest factor of any number is the number itself, and the smallest factor is 1. 1 ...
Read MoreC++ Program to Check Whether a Number can be Expressed as Sum of Two Prime Numbers
You are given a number and you need to write a C++ program to check whether a number can be expressed as sum of two prime numbers. Input / Output Scenarios Following is the input-output statement: Input: n = 19 Output: 19 can be expressed as the sum of two prime numbers. Explanation: 19 = 17 + 2, and both 17 and 2 are prime numbers. Input: n = 36 Output: 36 can be expressed as the sum of two prime numbers. Explanation: 36 = 31 + 5, and both 31 and 5 are prime numbers. C++ Program ...
Read MoreC++ program to Zoom digits of an integer
Zooming digits means printing the digits of a given number in an enlarged form using special characters. In this article, we will learn to print (display) enlarged (zoomed) form of the digits of a given number. Below is the representation of digits 01438 in zoom format, Example of Zoom Digits in Integers Form To generate the zoomed digit, we define the pattern logic for each digit based on its respective function prototype. Then, we create a function that sets the switch-case logic which processes the selected digit based on either user input or a given number. In this example, ...
Read MoreHow can we highlight the selected tab of a JTabbedPane in Java?
In this article, we will learn to highlight the selected tab of a JTabbedPane in Java. JTabbedPane is a common Swing component that is used to organize content into multiple tabs, while highlighting a selected tab will improve the GUI and make the interface interactive. What is a JTabbedPane? A JTabbedPane is a subclass of the JComponent class, and it can provide easy access to more than one panel. Each tab is associated with a single component that can be displayed when the tab is selected. A JTabbedPane can generate a ChangeListener interface when a tab is selected. What do ...
Read MoreHow do I clear the cin buffer in C++?
Before knowing the solution to clearing the cin buffer in C++, let us first see what the buffer is in C++. What is The Buffer in C++ A buffer is a temporary storage area that holds data while standard I/O devices are in use. In C++, a stream also work as a buffer. When a key is pressed, the input is not immediately sent to the program; instead, it is stored in a buffer. The operating system keeps this data in the buffer until the program is allocated time to process it. Why We Clear The cin Buffer in C++ ...
Read MorePrecision of floating point numbers in C++ (floor(), ceil(), trunc(), round() and setprecision())
Precision of floating point numbers is the accuracy upto which a floating point number can hold the values after decimal. For example, 10/6 = 1.6666666… these have recurring decimals which can take infinite memory spaces to be stored. To avoid memory overflow in such cases the compiler set a precision limit to the number. For float values in C++, the precision is set to 6-7 digit after that if the decimal recurs it will discard the value. So, to avoid any major losses when this discarding takes place there are methods and libraries that support the precision is float values. ...
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