Advance Java Programming(Class Test-I)

The purpose of a JTable object is to display rows and columns of data. It provides a graphical representation of data in a tabular format, allowing users to view and manipulate data in a structured manner.

The constants WINDOW_ACTIVATED, WINDOW_CLOSED, and WINDOW_DEICONIFIED are all defined in the WindowEvent class. These constants represent different types of window events that can occur, such as when a window is activated, closed, or deiconified. By including "All of the above" as the answer, it indicates that all of these constants are defined in the WindowEvent class.

The correct answer is Container. In Java, Container is a class that extends Component and serves as a base class for components that can contain other components. It provides methods for managing and organizing the layout of its child components. LayoutManager, Color, and Font are not subclasses of Component. LayoutManager is an interface used to define the layout behavior of containers, while Color and Font are classes used for specifying colors and fonts in graphical components.

The correct answer is new TextArea(50,80) because the first parameter of the TextArea constructor represents the number of rows and the second parameter represents the number of columns. Therefore, by passing 50 as the number of rows and 80 as the number of columns, we create a TextArea with 50 rows and 80 columns.

The method getActionCommand() is used in the ActionEvent class to retrieve the action command of the button. This method returns a String that represents the command associated with the event source. In this case, it is used to retrieve the action command of the button that triggered the event. The other methods mentioned, getId(), getModifiers(), and paramString(), do not specifically retrieve the action command and are not relevant to this context.

In swing MVC architecture, the "M" stands for Model. The Model represents the data and logic of the application. It is responsible for managing the data, performing calculations, and implementing the business logic. The Model interacts with the View and the Controller to update the data and notify the View of any changes. By separating the Model from the View and the Controller, swing MVC architecture promotes modularity and reusability, making it easier to maintain and update the application.

The program creates a GUI window using the AWT library. It adds a menu bar to the window with a single menu item "File". The menu item "File" has two sub-items "About" and "Exit". The window is then set to visible. Since there are no other options mentioned in the question, "none of the above" is the correct answer.

Swing components are platform independent because they are implemented using Java, which is a platform-independent programming language. This means that Swing components can run on any operating system or platform that supports Java, without requiring any modifications or adaptations. This makes Swing a popular choice for developing cross-platform applications, as it allows developers to write code once and deploy it on multiple platforms without the need for platform-specific implementations.

The correct answer is ItemEvent because when a List component is interacted with, such as when an item is selected or deselected, an ItemEvent is generated. This event allows for the detection and handling of changes made to the List component's items.

The correct answer is "swing" because JCheckBox is a component that belongs to the swing package in Java. The swing package provides a set of GUI components that are more flexible and customizable compared to the components in the AWT package. Therefore, if we want to use JCheckBox in our Java program, we need to import the swing package.

The correct answer is MouseMotionListener because the mouseDragged() method is a part of the MouseMotionListener interface. This interface is used to handle mouse events related to mouse movement, such as dragging the mouse. The other options listed, MouseListener, MouseEvent, and MouseAdapter, do not include the mouseDragged() method.

The setSize() method can be used to change the size of a Component object. This method allows you to specify the new width and height of the component. By calling this method, you can dynamically adjust the size of the component based on your requirements.

GridLayout is the correct answer because it arranges components in a grid-like manner, where each component occupies the same size in the container. It divides the container into equal-sized cells and each component is placed in a separate cell, ensuring that they all have the same size.

The correct answer is setLayout(null). By calling setLayout(null), the default layout manager is disabled and components can be manually positioned and sized using absolute coordinates.

The correct answer is thumbSize. In the given constructor, the third parameter represents the size of the thumb in the scroll bar. This parameter determines how much of the scroll bar is occupied by the thumb, which is used to indicate the current position within the scrollable content.

The default orientation to display the progress bar is horizontal. This means that the progress bar will be displayed as a horizontal line, with the progress increasing from left to right. This orientation is commonly used to visually represent the completion of a task or the progress of a process.

The missing statement in the given code is "c.add(jc);". This statement adds the JComboBox component "jc" to the Container "c". It is necessary to add the JComboBox to the Container in order to display it in the applet.

The correct answer is MenuComponent. MenuComponent is the abstract class that serves as the superclass for all menu-related classes. This means that all other menu-related classes, such as MenuBar, MenuItem, and CheckboxMenuItem, inherit from MenuComponent and can be considered subclasses of it. Therefore, MenuComponent is the correct answer as it is the superclass that provides common functionality and attributes to all menu-related classes.

The missing statement in the program is "bb.addActionListener(this);". This statement adds the ActionListener to the JButton "bb", so that when the button is clicked, the actionPerformed method will be called. This allows the program to perform certain actions based on the button that was clicked. Additionally, "e.getActionCommand()" is used to retrieve the text of the button that was clicked, which is then used in the if-else statements to determine the background color to set.

A JList component is needed to get the given output. JList is a Swing component that displays a list of items, allowing the user to select one or more items from the list. It is commonly used to display a list of choices for the user to select from. In this case, the output is a list of choices, so a JList component would be the appropriate choice.

The correct answer is "object that describe a state change in source". In event-driven programming, an event is an object that represents a specific occurrence or action that triggers a response in the program. This response could involve a change in the state of the program or the execution of a specific function. The term "source" refers to the entity or component that generates the event. Therefore, an event is an object that describes a state change in the source, indicating that something has happened and needs to be handled or responded to.

The missing statements in the given code are "javax.swing.*;" and "c.add(jc);". These statements are necessary to import the javax.swing package and add the JComboBox component to the container.

The correct answer is TreeNode because MutableTreeNode is a class that extends the TreeNode interface. The TreeNode interface is a fundamental interface in the Java Swing library that represents a node in a tree data structure. Therefore, it is correct to say that MutableTreeNode extends the TreeNode interface.

To get the following output, the components needed are a Panel, a TabbedPane, and a List. These components can be used to create a graphical user interface with multiple tabs and a list of items. The Panel can serve as the main container for the other components, while the TabbedPane allows for organizing content into different tabs. The List component can display a list of items that can be selected or interacted with by the user.

Both A & B are correct because the setText() method is used to set or change the text in a Label, while the getText() method is used to retrieve the text from a Label. Therefore, both methods can be used to manipulate the text in a Label.