Java Applets and Event Handling Quiz

A Swing component used to select one option from a list of choices presented in a dropdown menu.

A Swing component that creates a checkbox, allowing users to select or deselect multiple options.

A Swing component used to select one option from a group of related choices, allowing only one to be selected at a time.

A Swing component that allows users to select a value by sliding a knob along a range.

A Swing component used to create and display tabular data in a two-dimensional grid format, enabling users to edit data.

A Swing component that creates a menu bar with one or more dropdown menus, each containing a list of commands or options.

A Swing component that creates a text field specifically designed for entering and displaying passwords, masking the characters as they are typed.

A container in Swing that holds and manages other components, providing a space to arrange and display them.

An interface used to handle mouse-related events, such as clicking, pressing, entering, exiting, and releasing. It provides methods for responding to these actions.

A method within the MouseListener interface that is called when a mouse button is clicked on a component.

A method within the MouseListener interface that is called when the mouse enters a component's area.

A method within the MouseListener interface that is called when the mouse exits a component's area.

A method within the MouseListener interface that is called when a mouse button is pressed down on a component.

A method within the MouseListener interface that is called when a mouse button is released after being pressed down on a component.

An interface used to handle events related to window state changes, such as opening, closing, minimizing, and maximizing.

A method within the WindowListener interface that is called when a window is activated, meaning it becomes the active window in focus.

A component in the Event Model responsible for generating events. Events occur when the user interacts with components like buttons or the mouse. Examples: JButton generates an ActionEvent.

An object that is notified when a specific event occurs. Listeners are registered with the source and implement methods to handle the event. Examples: ActionListener, MouseListener.

An object that represents a specific action or state change in a component. Events are generated by sources and passed to listeners. Examples: ActionEvent, MouseEvent, KeyEvent.

The process of handling events by registering listeners and implementing event-handling methods. This mechanism ensures that appropriate actions are taken when events occur.

A change in an object's state or condition. Clicking a button, dragging the mouse, and pressing keys on the keyboard are common examples.

An object that triggers events. Buttons, checkboxes, lists, menu-items, scrollbars, etc., are common sources. They need to register with a listener to send event notifications.

The process of associating an event listener with a specific event source. The source needs to register the listener to receive notifications for a specific event.

The Java package that provides classes and interfaces for event handling. It allows developers to manage and respond to user interactions and other events in their applications.

A class that extends JFrame and implements MouseListener, demonstrating mouse event handling by reacting to different mouse events. It creates a JFrame with a JLabel to display "Mouse Entered", "Mouse Exited", "Mouse Pressed", and "Mouse Released" messages depending on the mouse events. The MouseListener methods in this class update the text of the JLabel when mouse events occur. This example showcases the basic interaction between a Java Swing component and user mouse actions.

An integral part of Java's Swing framework, residing in the javax.swing package. It's a top-level container, serving as the primary window of a GUI application. It's responsible for managing the application's visual elements, offering features such as window resizing, closing, and basic interactions.

An object used to display text in a Swing application, allowing you to show text labels within the application's interface. It's often used for displaying static text that provides information to the user. It's common to see JLabels used next to input fields, indicating the purpose of the field, or as titles for sections within a window.

A type of event that occurs when the user interacts with the mouse. It's triggered by various mouse actions, such as clicking, dragging, pressing, releasing, moving, and entering or exiting a component. These events are used to respond to user input actions.

An interface within the java.awt.event package, allowing a class to respond to mouse movements. Implementing this interface makes the class capable of handling drags and simple mouse movements within a component. This interface enables your class to track the continuous motion of the mouse and trigger specific actions when the mouse is dragged or moved.

A class or interface declared within the scope of another class or interface. They can access all members of the outer class, including private members. Inner classes are useful for logical grouping, enhancing encapsulation, and achieving a strong association between inner and outer classes.

The process of hiding internal details of a class and providing a controlled interface to interact with it. This is crucial for maintaining code modularity, preventing unwanted access to internal implementation, and enabling easier maintenance and updates.

An applet is a small Java program that runs within a web browser. To run it, you need an appletViewer, a tool that creates a window to execute the applet.

Passing parameters to an applet allows you to send extra information from the HTML page where it is embedded to the applet itself. This information is stored in a parameter tag within the HTML file.

The tag is used to specify the parameters within the HTML file. It is a sub tag of the tag and has two important attributes: name and value. The 'name' attribute defines the name of the parameter, and 'value' specifies the actual data associated with that name.

The tag is the primary container for an applet within an HTML page. It defines where the applet should be placed and loaded. Parameters, specified using the tag, are passed within the tag.

To compile a Java applet, you use the javac command. The command takes the name of the Java applet file as input. For example, to compile MyApplet.java, you would execute the command: javac MyApplet.java

A class defined within another class. It can access all members (data and methods) of the outer class, including private members.

A nested class that is not declared as static. It is also known as an inner class. It can be declared with access modifiers like public, private, protected, and default.

A non-static nested class that is defined directly within the outer class, not inside any method.

A non-static nested class defined within a method of the outer class. It cannot be accessed from outside the method.

A non-static nested class that is defined anonymously (without a name) using the 'new' keyword. It is used to override methods or implement interfaces.

A nested class declared with the 'static' keyword. It can be accessed using the outer class name and nested class name.

A nested class that is created inside a method of the outer class. It can only be accessed from within that method.