Advance Java Programming Prilim Exam

The purpose of a JTree is to present a hierarchical view of elements. It is used to display a structure where each element has a parent and can have one or more children. This allows for organizing and visualizing data in a tree-like structure, making it easier to navigate and understand relationships between different elements.

The correct answer is "ip.getHostName(), ip.getHostAddress()". This is because the code is trying to print the host name and IP address of "www.google.com". The method "ip.getHostName()" returns the host name, which is "www.google.com", and the method "ip.getHostAddress()" returns the IP address associated with that host, which is the IP address of Google's server. Therefore, using both methods will give us both the host name and IP address of "www.google.com".

All of the mentioned options (ALT_MASK, CTRL_MASK, SHIFT_MASK) are integer constants defined in the ActionEvent class. These constants represent modifier keys that can be used in combination with other keys to perform specific actions.

In event handling, a listener is an object that is notified when an event occurs. This means that when an event, such as a button click or a key press, happens, the listener object is informed and can perform some action in response to that event. This allows for the separation of event handling logic from the rest of the program, making it easier to manage and maintain. Therefore, the given answer "True" is correct.

The method "getLength()" is used to find the length of the byte array in a DatagramPacket.

The correct answer is forName,JdbcOdbcDriver, con.prepareStatement,setInt, executeUpdate(). In this code, the Class.forName() method is used to load the JDBC-ODBC driver. The DriverManager.getConnection() method is used to establish a connection to the database. The con.prepareStatement() method is used to create a PreparedStatement object for executing SQL statements. The stmt.setInt() method is used to set the value of the first parameter in the SQL statement. The stmt.executeUpdate() method is used to execute the SQL statement and returns the number of rows affected.

The package "java.awt.event" contains all the classes and methods required for event handling in Java. This package provides classes and interfaces for handling events such as mouse clicks, keyboard inputs, and window events. It includes classes like ActionListener, MouseEvent, KeyEvent, and WindowListener, which are essential for implementing event-driven programming in Java. Therefore, "java.awt.event" is the correct answer as it specifically focuses on event handling in Java.

The correct answer is "All of the above" because a Scrollable ResultSet in Java has three constants: TYPE_FORWARD_ONLY, TYPE_SCROLL_INSENSITIVE, and TYPE_SCROLL_SENSITIVE. These constants represent different types of scrollable result sets that can be used to navigate through the data in a ResultSet object. Therefore, all three options are valid constants for a Scrollable ResultSet.

The URLConnection class in Java provides a way to establish a connection to a specified resource referred to by a URL. It allows reading and writing data to and from the resource. Therefore, the statement that the URLConnection class can be used to read and write data to the specified resource referred by the URL is true.

TCP, FTP, Telnet, SMTP, POP, etc. are examples of protocols. A protocol is a set of rules and guidelines that govern the communication between devices in a network. Each of these protocols serves a specific purpose. TCP (Transmission Control Protocol) is responsible for establishing a reliable connection between devices. FTP (File Transfer Protocol) is used for transferring files between computers. Telnet is a protocol that allows remote login to a computer. SMTP (Simple Mail Transfer Protocol) is used for sending emails, and POP (Post Office Protocol) is used for retrieving emails from a mail server.

The correct answer is addMouseMotionListener(). This method is used to register a mouse motion listener in Java. It allows the program to detect and respond to mouse motion events, such as when the mouse is moved or dragged. By using this method, the program can add a listener that will be notified whenever there is a mouse motion event, and perform the desired actions accordingly.

The correct answer is "Class.forName,Connection, stmt.executeUpdate , con.close();". This answer is correct because it follows the correct sequence of statements to execute a SQL query. The first statement "Class.forName" is used to load the JDBC driver. The second statement "Connection" establishes a connection to the database. The third statement "stmt.executeUpdate" executes the SQL query to delete records from the "emp" table where the id is 33. The fourth statement "con.close()" closes the connection to the database.

The given statement is true. UDP (User Datagram Protocol) is a connectionless protocol in which data is sent in the form of packets called datagrams. These datagrams are sent to a specific IP address on the network without establishing a connection beforehand. Unlike TCP, UDP does not guarantee delivery or order of the packets, making it a faster but less reliable protocol for transmitting data.

The output of the program will display the Internet address of the host.

The correct answer is "all of the above." This is because the question is asking about the different types of JDBC drivers, and all four options listed (JDBC-ODBC bridge driver, Native-API driver, Network Protocol driver, and Native protocol) are valid types of JDBC drivers. Each type of driver has its own characteristics and uses, but all of them are considered JDBC drivers.

The correct answer is "getContentType()". This method is used to retrieve the content type of a file. It is likely a method provided by a programming language or framework that allows developers to access the metadata associated with a file, such as its content type.

The ServerSocket class is used to create servers that listen for either local or remote client programs. This class provides a mechanism for the server to listen for incoming client connections and accept them. Once a client connection is accepted, the server can then communicate with the client using input and output streams. Therefore, the ServerSocket class is the correct choice for creating servers that listen for client programs.

The purpose of JTable is to display rows and columns of data.

The given method "Statement state = con.createStatement();" creates a new Statement object and assigns it to the variable "state". The method "createStatement()" is called on the "con" object, which is likely a connection to a database. This method is used to create a new Statement object that can be used to execute SQL queries on the database. The created Statement object is then returned as the return value of the method.

The java.sql package contains classes that help in connecting to a database, sending SQL statements to the database, and processing the query results. This package provides the necessary tools and functionality for interacting with a database in Java applications. The classes in this package allow developers to establish database connections, execute SQL queries, retrieve and manipulate data, and handle database transactions. This package is essential for any Java application that needs to work with a database.

The executeQuery() method is the correct answer because it is used to execute a simple query and retrieve a single Result Set object. This method is typically used when you want to retrieve data from a database, such as selecting records from a table. It returns a Result Set object that contains the data fetched from the database, which can then be processed further in the code.

The correct answer is Label, TextField, Button. This is because the output includes a label, a text field, and a button. These components are commonly used in graphical user interfaces to display text, allow user input, and trigger actions respectively. The other options mentioned, such as Applet and Grid Layout, are not components but rather layout managers that can be used to arrange components in a specific way.

The setIcon(ImageIcon i) method is used to display an icon on a component.

The correct answer is MalformedURLException. The URL class's constructors throw this exception when a malformed URL is encountered. This means that the URL provided is not in the correct format, such as missing the protocol or having invalid characters. The MalformedURLException allows the programmer to handle this specific error and take appropriate action, such as displaying an error message to the user or logging the exception for debugging purposes.

The missing statement in the given program is actionPerformed(ActionEvent ae). This is because the other three methods (adjustmentPerformed, itemStateChanged with ItemEvent, and itemStateChanged with ActionEvent) are already declared and mentioned in the program. However, actionPerformed with ActionEvent is missing, indicating that it needs to be included in the program.

A CallableStatement is used to call stored procedures from within a JDBC application. It provides a way to execute SQL statements that may contain input and output parameters. Unlike a regular Statement or PreparedStatement, a CallableStatement is specifically designed for executing stored procedures. It allows the application to pass input parameters to the stored procedure and retrieve output parameters or result sets returned by the stored procedure. Therefore, the correct answer is CallableStatement.

InetAddress is the correct answer because it is a class in Java that is used to encapsulate both IP addresses and DNS names. It provides methods to retrieve and manipulate IP addresses and perform DNS lookups. This class is commonly used in networking applications to identify and communicate with remote hosts using their IP addresses or DNS names.

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The correct answer is Class.forName ("sun.jdbc.odbc.JdbcOdbcDriver"). This statement is used to load the JDBC-ODBC driver by specifying the fully qualified name of the driver class as a string parameter. The Class.forName method is used to dynamically load the driver class at runtime, and in this case, it loads the JDBC-ODBC driver.

The statement "s.executeUpdate()" should be added in the program to get the correct output. This statement is used to execute the SQL statement in the program and update the database. It is typically used for statements that modify the data in the database, such as INSERT, UPDATE, or DELETE statements.

When the button at the end of the scroll bar is clicked to increase its value, the constant value that will change is UNIT_INCREMENT. This constant represents the amount by which the scroll bar value will increase when the button is clicked.

A listener is an object that is notified when an event occurs. This means that when a specific event takes place, the listener object is informed and can perform certain actions or execute specific code in response to that event. The listener acts as a callback mechanism, allowing the program to respond dynamically to events as they happen.

The method getAdjustmentType() can be used to determine the type of adjustment event. This method specifically retrieves the adjustment type associated with the event. The other methods getType(), getEventType(), and getEventObjectType() may retrieve different information about the event, but they do not specifically provide the adjustment type. Therefore, getAdjustmentType() is the correct method to use in order to determine the type of adjustment event.

The PreparedStatement object allows you to execute parametrized queries. It is a precompiled SQL statement that can accept input parameters, which are placeholders for values that will be supplied at runtime. This allows for efficient execution of repeated queries with different parameter values, as the statement is only compiled once and can be reused. The PreparedStatement also provides protection against SQL injection attacks by automatically escaping special characters in the parameter values.

The Choice component in AWT is used to create a popup list of string items from which only one can be selected at a time. It allows the user to select a single item from a list of options provided. This component is commonly used in forms or menus where the user needs to make a single selection from a predefined set of options.

The correct answer is Label because a label is a passive control that is used to display text or information. It does not have any interactive functionality or control over user input. The other options, such as Checkbox, Scrollbar, and Button, are all active controls that allow the user to interact with them and perform specific actions.

The program creates a new URL object with the given URL "http://www.sanfoundry.com/javamcq". The getPort() method is then called on this object. Since the URL does not specify a port number, the getPort() method returns -1.

The given program outputs "http://www.google.com" because it is the only entry in the program that starts with "http://" and ends with ".com". The other entries do not meet this criteria, so they are not included in the output.

The given code connects to a database using JDBC and executes a select query to fetch all records from the "emp" table. After executing the query, the code uses the "rs.absolute(3)" method to move the cursor to the third row of the result set. Then, it prints the values of the first and second columns (FName and LName) from that row. Therefore, the correct answer is "print only row 3 value and print FName, LName from emp table."

The method getID() can be used to determine the type of event. This is because the ID of an event can provide information about the type or category of the event. By calling the getID() method, we can retrieve the ID associated with the event and use it to identify the type of event that occurred.

Both the DatagramPacket and DatagramSocket classes are necessary to implement datagrams. The DatagramPacket class represents a datagram packet, which is essentially a container for a message that can be sent over a network. The DatagramSocket class, on the other hand, is responsible for creating a socket that can send and receive datagram packets. Therefore, to implement datagrams, both classes are required.

The superclass of all Adapter classes is Component. The Applet class is a subclass of the Component class, so it is not the superclass. Event and InputEvent are not related to the Adapter classes.

The correct answer is "public Socket accept()". This method is commonly used in the ServerSocket class to accept incoming client connections. It waits until a client connection is made and returns a Socket object representing that connection. This allows the server to communicate with the client using the returned Socket object. The other methods mentioned, getOutputStream() and close(), are not commonly used in the ServerSocket class.

The correct answer is the first option: String b = "delete from emp where ID=1"; PreparedStatement ps=con.prepareStatement(b);ps.executeUpdate(); This sequence of code uses the correct syntax to delete records from the "emp" table where the ID is equal to 1. The PreparedStatement is used to execute the SQL statement and the executeUpdate() method is used to perform the actual deletion.

JDBC stands for Java Database Connectivity, which is a Java API that allows Java programs to interact with databases. It provides a set of classes and methods for executing SQL statements, connecting to databases, and retrieving and manipulating data. The correct answer is "Java API" because JDBC is an API specifically designed for database connectivity in Java.

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The default length of the queue in the ServerSocket constructor with the parameter int portno is 50. This means that the ServerSocket can accept up to 50 incoming connections before it starts rejecting new connections.

The error in the given program is in the statement where the JTable is created.

The correct method of the statement interface is "public ResultSet executeQuery(String sql) throws SQLException". This method takes a string parameter representing the SQL query and returns a ResultSet object. It also throws a SQLException if there is an error executing the query.

AWT (Abstract Window Toolkit) supports 7 types of controls, which are subclasses of the Component class. These controls include Button, Checkbox, Choice, Label, List, TextArea, and TextField. Each control serves a different purpose and allows for user interaction in a graphical user interface.