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Questions and Answers

What is the primary reason for using a layout manager instead of manually laying out components in Java?

  • It provides more control over event handling for components.
  • It simplifies the arrangement of components and handles resizing automatically. (correct)
  • It allows for easier editing of components' properties.
  • It prevents the need to manage component visibility.

What method is used to associate a layout manager with a Container object?

  • setLayout() (correct)
  • createLayout()
  • initLayout()
  • setLayoutManager()

What happens when you pass null to the setLayout() method?

  • You can manually define the layout using setBounds(). (correct)
  • All components are hidden by default.
  • The default layout manager is activated.
  • The container cannot hold any components.

Which of the following constructors for FlowLayout specifies horizontal and vertical gaps between components?

<p>FlowLayout(int how, int horz, int vert) (B)</p> Signup and view all the answers

Which of the following methods is primarily associated with the Component class?

<p>public void setVisible(boolean) (B)</p> Signup and view all the answers

What is the default alignment for components when using FlowLayout?

<p>FlowLayout.CENTER (D)</p> Signup and view all the answers

Which container cannot contain a title bar and menubars but can still hold buttons or text fields?

<p>Panel (A)</p> Signup and view all the answers

Which layout manager is characterized by a flowing layout similar to a text editor?

<p>FlowLayout (D)</p> Signup and view all the answers

What type of layout does the FlowLayout manager use by default?

<p>Row-wise arrangement. (D)</p> Signup and view all the answers

What is the correct name of the method to alter the layout of a Java container?

<p>setLayout(aLayoutManager) (D)</p> Signup and view all the answers

Which Swing class is utilized for creating frames in a Java application?

<p>JFrame (D)</p> Signup and view all the answers

If you want to disable a layout manager in Java, which value should be passed to setLayout()?

<p>null (A)</p> Signup and view all the answers

Which method will set the text of a Label object in Java?

<p>setText() (A)</p> Signup and view all the answers

What event is generated by pressing a button in Java?

<p>ActionEvent (C)</p> Signup and view all the answers

Which package contains all the necessary classes and methods for event handling in Java?

<p>Java.awt.event (D)</p> Signup and view all the answers

In Java, what term describes an area on the screen bounded by borders and containing various interface elements?

<p>A frame (A)</p> Signup and view all the answers

What is the primary function of the List class?

<p>To create a scrolling selection list for multiple choices (B)</p> Signup and view all the answers

What does the numRows parameter specify in the List constructor List(int numRows)?

<p>The number of items always visible in the list (D)</p> Signup and view all the answers

How do you add a new item to a List at a specific index?

<p>Using the add(String name, int index) method (D)</p> Signup and view all the answers

Which method would you use to retrieve the index of the currently selected item in a List?

<p>getSelectedIndex() (C)</p> Signup and view all the answers

When implementing the ActionListener interface for a List, what does the getActionCommand() method return?

<p>The name of the newly selected item (B)</p> Signup and view all the answers

What will the method getSelectedItem() return if no item has been selected?

<p>Null (D)</p> Signup and view all the answers

Which statement is true regarding the multipleSelect parameter in the List constructor?

<p>If set to true, multiple items can be selected simultaneously (A)</p> Signup and view all the answers

What is the purpose of the getItem(int index) method in the List class?

<p>To retrieve the name of the item at the specified index (A)</p> Signup and view all the answers

What is the primary purpose of the getConnection method in JDBC?

<p>To establish a connection to a database (C)</p> Signup and view all the answers

Which method is used to permanently save changes made in a transaction?

<p>commit() (C)</p> Signup and view all the answers

What does the setAutoCommit(boolean status) method do?

<p>Manages the default transaction behavior (D)</p> Signup and view all the answers

What is the role of the Stub in RMI programming?

<p>It acts as a gateway for the client-side (A)</p> Signup and view all the answers

Which of the following methods would you use to close a JDBC connection?

<p>close() (A)</p> Signup and view all the answers

In RMI, what do the client and server applications interact with to communicate?

<p>Remote interface (D)</p> Signup and view all the answers

What does the createStatement(int resultSetType, int resultSetConcurrency) method provide?

<p>Generates ResultSet objects with specified type and concurrency (D)</p> Signup and view all the answers

What happens when the rollback() method is called?

<p>All changes made since the last commit are discarded (B)</p> Signup and view all the answers

What method is used to change the selection mode of a JList?

<p>setSelectionMode() (D)</p> Signup and view all the answers

What is the primary purpose of the JButton class in Swing?

<p>To implement a push button (A)</p> Signup and view all the answers

Which of the following selection modes does NOT exist in ListSelectionModel?

<p>MULTIPLE_SELECTION (C)</p> Signup and view all the answers

How can you obtain the action command associated with a JButton?

<p>getActionCommand() (B)</p> Signup and view all the answers

Which class should a Swing applet extend to gain Swing functionality?

<p>JApplet (D)</p> Signup and view all the answers

What is generated when a JButton is pressed?

<p>ActionEvent (C)</p> Signup and view all the answers

Which method must be implemented to handle button press events in a JButton?

<p>actionPerformed() (D)</p> Signup and view all the answers

When using multiple buttons, how can you identify which button was pressed?

<p>Through the action command (A)</p> Signup and view all the answers

What is the primary use of persistent cookies?

<p>To store long-term information such as user preferences (A)</p> Signup and view all the answers

Which method of the Cookie class is used to change the value of a cookie?

<p>public void setValue(String value) (C)</p> Signup and view all the answers

How does a persistent cookie differ from a session cookie?

<p>Persistent cookies are valid across multiple sessions (B)</p> Signup and view all the answers

Which class in the javax.servlet package is used to provide an output stream for sending binary data to the client?

<p>ServletOutputStream (C)</p> Signup and view all the answers

What happens to persistent cookies when they expire?

<p>They are automatically deleted from the user's device (B)</p> Signup and view all the answers

Which method returns the name of a cookie?

<p>public String getName() (D)</p> Signup and view all the answers

What does the GenericServlet class do?

<p>Defines a generic and protocol-independent servlet (C)</p> Signup and view all the answers

What type of notifications does the ServletContextAttributeEvent class generate?

<p>Changes to servlet context attributes (D)</p> Signup and view all the answers

Flashcards

List Object

A graphical control that displays a list of choices, allowing single or multiple selections.

Multiple Selections

Allows the user to choose more than one item from the list.

getSelectedItem()

Returns the name of the currently selected item in a single-selection list, or null if no item or multiple items are selected.

getSelectedIndex()

Returns the index of the currently selected item.

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add(String name)

Adds an item to the end of the List control.

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add(String name, int index)

Inserts an item at a specified index in the List control. -1 implies the end.

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getItemCount()

Returns the total number of items in the List.

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getItem(int index)

Returns the name of the item at a specified index.

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Default Layout Manager

The layout manager used by a container if no specific layout manager is set using setLayout() method.

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setLayout()

A method used to set the layout manager for a container, controlling how its components are arranged.

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FlowLayout

A simple layout manager that arranges components in a flow, like lines of text, starting from the top left corner.

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FlowLayout Alignment

Controls the horizontal alignment of components in a FlowLayout. Options include LEFT, CENTER, RIGHT, LEADING, and TRAILING.

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FlowLayout Constructors

FlowLayout comes with constructors to customize its behavior. It has forms to set alignment and spacing between components.

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Disable Layout Manager

By passing null to setLayout(), you can disable the layout manager and manually position components using setBounds().

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setBounds()

A method used to manually set the position and size of components, employed when a layout manager is disabled.

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Manual Layout Disadvantage

Manually positioning components using setBounds() can be tedious and requires careful calculations, making it more prone to errors.

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Component Class

The base class for all user interface elements like buttons, text fields, and labels in Java. It provides fundamental methods for managing the appearance and behavior of these components.

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JFrame Class

The Swing class used to create top-level windows with a title bar and borders, providing the foundation for graphical applications.

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setLayout(LayoutManager)

This method allows you to set the layout manager for a container, controlling how its child components will be arranged within it.

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What is a layout manager?

A layout manager dictates how components are arranged within a container like a JFrame or JPanel, ensuring a consistent and user-friendly layout.

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Panel

A container component that can hold other components but is itself not a top-level window. It's often used to group related components for structure and organization.

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What is a Collection object?

An object that stores a group of other objects, allowing you to manage them as a single entity. Examples include lists, sets, and maps.

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setText()

This method is used to set the visible text of a Label object. It allows you to update the displayed text within the label.

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ActionEvent

An event generated when a user interacts with a component like a button, triggering an action.

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JDBC Connection

A session between a Java application and a database. It acts as a factory for creating Statement, PreparedStatement, and DatabaseMetaData objects.

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createStatement()

A method of the Connection interface used to create a Statement object for executing SQL queries.

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setAutoCommit(boolean status)

Used to control automatic transaction commit behavior. When true, changes are saved automatically after each query. When false, changes are held until commit() is called explicitly.

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commit()

Saves all changes made to the database since the last commit or rollback.

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rollback()

Reverts all changes made to the database since the last commit or rollback.

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RMI Client-Side

In RMI, the client requires a remote interface file and a client application. The client interacts with the remote interface through a proxy object and sends requests to the server.

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RMI Server-Side

The server requires an interface implementation file and a server application. The server receives requests from the client and provides the requested services.

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RMI Stub

An object that acts as a gateway for client-side requests. It resides on the client and represents the remote object.

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Session Cookie

A temporary cookie that is valid only for the current browsing session and is deleted when the browser is closed. It's commonly used to store shopping cart details.

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Persistent Cookie

A cookie that remains stored on the user's computer for a specific duration or until it's manually deleted. It's used to store long-term information like user preferences and login details.

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setMaxAge(int expiry)

A method in the Cookie class that sets the maximum age of a cookie in seconds. It determines how long the cookie will persist on the user's computer.

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getName()

A method in the Cookie class that returns the name of a cookie. The name cannot be changed after the cookie is created.

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GenericServlet

A class in the javax.servlet package that provides a generic and protocol-independent foundation for creating servlets. It handles common servlet functionalities, making it easier to create servlets for different protocols.

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ServletContextAttributeEvent

An event generated when an attribute of the servlet context changes. It notifies listeners about these changes, allowing them to react accordingly.

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ServletRequestEvent

An event that signals a lifecycle event for a servlet request, such as when the request is created, processed, or destroyed. It enables listeners to track the progress of requests.

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ServletRequestWrapper

A utility class that wraps a ServletRequest object, allowing developers to customize the request object's behavior without modifying the underlying request.

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JList Selection Modes

JList allows you to configure how users can select items. It supports single selection (one item), single interval selection (contiguous range of items), and multiple interval selection (non-contiguous ranges).

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JButton Constructor

You can create a JButton with a constructor that accepts a string as text, an icon, or both. Buttons trigger an ActionEvent when pressed.

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JButton Action Command

JButton's actionCommand is a string used to identify the button when it is pressed. By default, it's the button text. You can set and retrieve it.

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JApplet Class

A Swing applet extends JApplet, which is a top-level container derived from Applet. It supports Swing elements and provides panes for arranging components.

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JApplet's Content Pane

Components are added to JApplet's content pane, like they are in JFrame's content pane. This provides a space to arrange user interface elements.

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ListSelectionEvent

An event generated when a user makes a selection in a JList. You can get information about the selection using JList methods.

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ListSelectionListener

An interface for listening to list selection events. You implement this to respond to changes in the selection.

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setSelectionMode()

JList's setSelectionMode() method lets you change the selection behavior, allowing for single, interval, or multiple selection.

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Study Notes

Advanced Java Programming - Question Bank

  • V SEMESTER BCA
  • Course: Advanced Java Programming
  • Course Code: 22CAC-13

Module I

  • Applet Output Display: The paint() method is used to display applet output.
  • String Output in Applet: The drawString() method is used to output strings within an applet.
  • AWT: Acronym for Abstract Window Toolkit, a Java API for creating graphical user interfaces.
  • Exception in read() method: The read() method can throw an IOException.
  • Input/Output Packages: The java.io package provides classes and interfaces for input/output operations.
  • Non-member class of java.io package: java.io.Writer is not a member class, java.io.StringReader is.
  • Non-input/output related class: java.io.File is not related to input/output stream functionality.
  • Byte Streams: java.io.InputStream and java.io.OutputStream are used for reading and writing byte data.
  • Character Streams: java.io.Reader and java.io.Writer are used for reading and writing character data.

Module II

  • Container without title bar/menu: A Panel is a container that does not have a title bar or menu bar.
  • Event handling package: java.awt.event provides event classes and listener interfaces for event handling.
  • Rectangle drawing: The drawRect(int x, int y, int width, int height) method in the java.awt.Graphics class draws a rectangle.
  • GUI application window: A Frame is a window that represents a GUI application and can have a title bar, icon, and menus.
  • ActionListener implementation: There are several ways to implement the ActionListener interface: by creating a new class, using an anonymous inner class, etc.

Module III

  • Graphics methods: The Graphics class provides methods for graphics programming tasks.
  • Label text handling: The setText() method is used to set the text displayed in a Label object.
  • Container layout: A Container's layout can be altered using the setLayout() method, which accepts a LayoutManager object.
  • Key press detection: Use the getKey() method for detecting a pressed key..
  • Methods invoked for button press: An ActionEvent is generated when a button is pressed.
  • Event handling package: java.awt.event is the package containing classes for event handling.
  • GUI window object: A Frame is a visible window in a GUI application.
  • String Label modification: The Label class has a setText() method to change the text of the label.
  • Passive controls: Controls like Labels are passive, they don't respond to user interaction directly.

Module IV - JDBC

  • Query Compilation: A JDBC query is compiled when it's prepared.
  • Data Transfer: JDBC's ResultSet, PreparedStatement, and CallableStatement methods handle data transfer between applications and databases.
  • UDA Acronym: Universal Data Access
  • Connection establishment: The DriverManager class's getConnection() methods establish connections to databases.
  • JDBC Driver Types: JDBC technology provides: JDBC-ODBC bridge, NativeAPI, NetworkProtocol, and Thin drivers.
  • JDBC core package: java.sql is the core package.
  • RMI Methods: The Naming class has methods like rebind() to manage remote objects.
  • Executing SQL Queries: Using the executeQuery() method to retrieve data is very common.

Module V

  • Cookies: Used for client-side maintaining session information. Cookies can be persistent or non-persistent (stateful or stateless).
  • Servlet Lifecycle Methods: init(), service(), destroy() are the primary lifecycle methods for a Servlet.

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