notes on core java in java

The elements of a GridBagLayout are organized according to a grid. However, the elements are of different sizes and may occupy more than one row or column of the grid. In addition, the rows and columns may have different sizes The elements of a GridBagLayout are of equal size and are laid out using the squares of a grid. … Read more

A component can handle its own events by implementing the required event-listener interface and adding itself as its own event listener. In Java, GUI components can handle their own events by implementing event listener interfaces. The most common way to handle events for GUI components is by implementing listener interfaces such as ActionListener, MouseListener, KeyListener, … Read more

The ActionEvent event is generated as the result of the clicking of a button. In Core Java, when a button is clicked, the corresponding event is typically handled by an ActionListener. The ActionListener interface provides a way to respond to events triggered by user interactions, such as button clicks. The correct answer to the question “What event … Read more

The java.util.EventObject class is the highest-level class in the event-delegation class hierarchy. In the Java event-delegation model, the highest-level event class is java.util.EventObject. This class is the root class for all event classes in the Java AWT (Abstract Window Toolkit) and Swing libraries. Events in Java are based on the observer design pattern, where an event source … Read more

A class is a subclass of itself. In Java, a class is not a subclass of itself. Inheritance in Java involves creating a new class based on an existing class, and the new class is referred to as the subclass. The existing class is known as the superclass. A subclass inherits attributes and behaviors from … Read more