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Articles by Alshifa Hasnain
Page 15 of 23
How to display the different font items inside a JComboBox in Java?
In this article, we will learn to display the different font items inside a JComboBox in Java. The Swing framework provides a powerful JComboBox component that allows users to select an object from a drop-down list. What is a 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 an ActionListener, ChangeListener, and ItemListener interfaces when the user interacts with a combo box. Syntax The following is the syntax: JComboBox Box_Name = new JComboBox(array); Problem ...
Read MoreWhat are the differences between JRadioButton and JCheckBox in Java?
Both JRadioButton and JCheckBox components can extend the JToggleButton class in Java, the main difference is that JRadioButton is a group of buttons in which only one button can be selected at a time, whereas JCheckBox is a group of checkboxes in which multiple items can be selected at a time. JRadioButton A JRadioButton is a component that represents an item with a state selected or unselected. Usually, a group of radio buttons is created to provide options to the user, but only one option can be selected at a time. JRadioButton will generate an ActionListener, ChangeListener, and ItemListener interfaces. Instantiating JRadioButton: JRadioButton Radio_Name = new JRadioButton(); ...
Read MoreHow can we create a login form in Java?
We can develop a login form in Java using Java Swing technology. In this example, we can create two labels username and password, two text fields for the user to enter valid credentials, and finally, one submit button. Once the user is able to enter the valid credentials in the two text fields, we can able to see Hello admin in the login form. Setting Up the Project We’ll use Java Swing, a GUI toolkit for building desktop applications. Required Libraries are: javax.swing.* (for Swing components) java.awt.* (for layout management) ...
Read MoreCan we change the order of public static void main() to static public void main() in Java?
Yes, we can change the order of public static void main() to static public void main() in Java, the compiler doesn't throw any compile-time error or runtime error. In Java, we can declare access modifiers in any order, the method name comes last, the return type comes second to last and then after it's our choice. But it's recommended to put access modifier (public, private and protected) at the forefront as per Java coding standards. Java Method Modifiers and Their Order Java allows you to place method modifiers (the keyword "public, " "static, " "final, " etc.) in various orders. The Java ...
Read MoreWhat are the differences between paint() method and repaint() method in Java?
In this article, we will learn about the differences between the paint() method and the repaint() method in Java. In the AWT and Swing frameworks, rendering graphical components is done in two different roles by the two methods paint() and repaint(). The paint() Method This method holds instructions to paint this component. In Java Swing, we can change the paintComponent() method instead of paint() method as paint calls paintBorder(), paintComponent() and paintChildren() methods. We cannot call this method directly instead we can call repaint(). Syntax The following is the syntax: public void paint(Graphics g) { // paint() method ...
Read MoreHow can we minimize/maximize a JFrame programmatically in Java?
In this article, we will learn to minimize/maximize a JFrame programmatically in Java. In Swing, programmers often need to resize the window as needed. For example, they can shrink the window when carrying out background tasks or expand the window size for a better full-screen experience. What is a JFrame? A JFrame class is a subclass of Frame class and the components added to a frame are referred to as its contents, these are managed by the contentPane. A JFrame contains a window with title, border, (optional) menu bar and user-specific components. By default, we can minimize a JFrame by ...
Read MoreWhat is the importance of a Cursor class in Java?
In this article, we will learn about the importance of the Cursor class in Java. Under the Swing toolkit, the Cursor class provides an improved user experience by providing graphical(visual) feedback. What is a Cursor class? A Cursor is a subclass of the Object class, and it can be defined as point or indicator on the screen. A Cursor is used to select the input from the system that the user operates with the mouse. The important methods of Cursor class are getDefaultCursor(), getName(), getPredefinedCursor(), getSystemCustomCursor(), and getType(). Syntax The following is the syntax: Cursor cursor = new Cursor(Type_of_Cursor); Different ...
Read MoreDifference between Tree Set and Hash Set in Java
In Java, HashSet and TreeSet both belong to the collection framework. HashSet is the implementation of the Set interface, whereas TreeSet implements a sorted set. TreeSet is backed by TreeMap while HashSet is backed by a HashMap. Difference Table The following are the key differences between HashSet and TreeSet : Sr. No. Key ...
Read MoreWhat are the differences between JTextField and JTextArea in Java?
The main difference between JTextField and JTextArea in Java is that a JTextField allows entering a single line of text in a GUI application while the JTextArea allows entering multiple lines of text in a GUI application. JTextField The following are the key characteristics of JTextField in Java: A JTextFeld is one of the most important components that allow the user to an input text value in a single line format. A JTextField will generate an ActionListener interface when we trying to enter some input inside it. The JTextComponent is a superclass of JTextField that provides a common set ...
Read MoreExplain the basic structure of a program in Java?
In this article, we will learn about the basic structure of a program in Java. Java is widely used for developing large-scale applications, including Android apps, web applications, and enterprise software. To write a Java program, it's essential to understand its basic structure, which consists of several key components. Components A typical structure of a Java program contains the following elements: Package declaration Import statements Comments Class definition Class variables, Local variables Methods/Behaviors ...
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