Java SQL and Inner Classes Quiz

The next() method of the ResultSet interface is used to move the cursor to the next row in the result set. It returns true if there is a next row, and false if there are no more rows.

The Statement interface encapsulates an SQL statement. It's used to parse, compile, plan, and execute SQL queries.

The getMetaData() method of the ResultSet interface returns a ResultSetMetaData object, which contains information about the result set, such as the number of columns and their names.

The getColumnCount() method of the ResultSet interface returns the number of columns in the result set.

The commit() method belongs to the Connection interface. It commits the current transaction, making all changes permanent in the database.

Adapter class makes programmers task easier by providing a simplified way to handle events. It has methods that correspond to the event listener interface, but with empty implementations.

When using an Adapter class, all the methods in the superclass must be overridden. If the class contains 5 methods, all 5 must be overridden to handle specific events.

ComponentEvent is a superclass for events related to changes in a component's state, such as resizing, moving, or hiding. This class represents the events that occur when the state of a component changes.

The ComponentAdapter class is an abstract adapter class that provides empty implementations of the methods in the ComponentListener interface. This class simplifies event handling for components in Java.

The MouseListener interface defines methods for handling mouse events. The MouseAdapter class simplifies mouse event handling by providing empty implementations of all the methods in the MouseListener interface. By extending MouseAdapter, you only need to override the methods you're interested in.

The AWTEvent class is the superclass for all AWT (Abstract Window Toolkit) events. Other event classes, like ComponentEvent and WindowEvent, inherit from AWTEvent. This provides a common base for all AWT events, making event handling more structured and consistent.

The FocusListener interface is used to handle events related to changes in the focus of a component. The FocusAdapter class provides default empty implementations for the FocusListener methods, simplifying event handling for focus changes.

Adapter classes provide a way to implement only the methods you need, avoiding unnecessary overrides and making your code cleaner and more efficient.

A nested class can access private members of its enclosing class even if it is not declared as static. This is because it has access to the enclosing class's private members

Inner classes provide a mechanism for encapsulating code within a class, enhancing security and protection. By limiting access to members, it can be easier to ensure data integrity and prevent unauthorized modifications.

Inner class is a class declared inside another class. It provides a way to organize and modularize code within a larger class. It can only access the members of the outer class, including private ones, even if the inner class is declared as non-static

The AdjustmentEvent class defines constants for various events, including BLOCK_DECREMENT, BLOCK_INCREMENT, and TRACK. These constants represent various adjustments that can be applied to a component.

The ItemEvent class defines constants to denote changes in the selection state of an item, such as DESELECTED and SELECTED, representing whether an item has been selected or not.

Non-static nested classes have a close dependency on the outer class. They cannot be instantiated without an instance of the outer class. They essentially act as inner members of the outer class and are also known as inner classes.

Inner classes are useful to:

1. Code optimization, by reducing redundancy and enhancing readability.
2. Access all members of the outer class, including private members.
3. Improve code readability and maintainability, by grouping related tasks.

To access members of an inner class, you can use the 'dot' notation (.) to access the inner class's members.

The accept() method in Java is used to establish a connection with a client socket that is attempting to connect to the server socket.

A SQL statement that removes rows from a table based on a specific condition. In this case, it removes rows from the 'Employee' table where 'empid' matches the inputted 'num'.

The ServerSocket class is used to create a server socket, which listens for incoming client connections. It is the foundation for server-side networking.

A class in Java that represents a graphical user interface component. It provides methods for adding other components, setting the size, layout, and visibility of the component.

The Socket class represents a socket, which is the communication endpoint between a client and a server. It's used for both client-side and server-side networking.

A container in Java that acts as a blank canvas where you can add buttons, text fields, and other components without a title bar or menu bar. Think of it as a simple area to place GUI elements.

A component in Java used to display a list of choices to the user. Each choice can be selected or deselected independently.

The Socket constructor, Socket(String hostname, int port), creates a client socket and attempts to establish a connection with the specified hostname and port.

A class in Java that is used to handle actions performed by components such as buttons, list items, and menu items. It provides a method called 'processActionEvent()' to handle these actions.

The getServerSocket method is used to retrieve the ServerSocket object that was used to create the current socket. This method is typically used in server-side applications.

A feature of Java Swing, a GUI toolkit, that allows the user interface to adapt to the operating system's theme and appearance. It provides a more native look and feel across different platforms.

The getInputStream() method of the Socket class returns an InputStream object representing the input stream associated with the socket. It allows you to read data received from the remote endpoint.

A design pattern in software development that separates the presentation, logic, and data management of an application into distinct components. It allows for easier maintenance and separation of concerns.

The getOutputStream() method of the Socket class returns an OutputStream object representing the output stream associated with the socket. It allows you to write data to the remote endpoint.

The bind() method is used to associate a server socket with a specific port and IP address or local address. This process reserves the port and gets the server ready to listen for connections.

A common error in Java programming where a variable is used before it is declared. The compiler cannot find the variable 'p1' because it has not been defined within the scope of the code.

Controller actions can have different return types depending on the outcome of processing the user request. The 'View Result' returns the view to be rendered, 'Javascript Result' returns JavaScript code to be executed, and 'Redirect Result' redirects to another URL.

MVC execution involves handling user requests in a structured manner. First, the application receives a request. Then, it performs routing to determine the appropriate controller. Finally, it creates an MVC request handler to process the request.

The 'add' method is used in the Frame object to incorporate GUI components into its visual structure. By using the 'add' method, you can embed various GUI elements like buttons, text fields, or panels within the Frame.

The controller's primary responsibility involves executing the incoming user request within the MVC architecture. It acts as the intermediary between the user interface (view) and the data (model).

The 'netAddress' class encapsulates the IP address and Domain Name System (DNS) information within a single entity. It provides a convenient way to represent and manipulate network addresses.

A JFrame, a top-level window, provides options for user behavior when you close it. Three options are available: 'DISPOSE_ON_CLOSE' which disposes the window, 'HIDE_ON_CLOSE' which hides the window, and 'DO_NOTHING_ON_CLOSE' which takes no default action. The 'LOWER_ON_CLOSE' option is not available because it is a separate operation for JFrame objects.

The getString() method is used to retrieve a text string from a user interface. The method returns the collected text data as a string. It allows you to read the input entered by the user.