ITSW 3024 D387 Advanced Java
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Free ITSW 3024 D387 Advanced Java Questions
If you were to design a web application that requires user authentication, how would a Java servlet be utilized in this process?
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The servlet would directly handle the database schema design.
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The servlet would manage user sessions and validate credentials by processing login requests.
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The servlet would generate static HTML pages for user login.
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The servlet would execute SQL commands without any error handling.
Explanation
Correct Answer
B. The servlet would manage user sessions and validate credentials by processing login requests.
Explanation
In a web application, a Java servlet acts as a controller that processes incoming HTTP requests. For user authentication, the servlet typically receives login form data, checks the provided credentials against a database, and then establishes a session for the authenticated user. It also handles responses such as redirecting users based on authentication outcomes, ensuring secure and dynamic control over the authentication process.
Why other options are wrong
A. The servlet would directly handle the database schema design.
This is incorrect because database schema design is handled by database management systems or via tools like SQL scripts or workbench interfaces, not by Java servlets. Servlets interact with data but are not responsible for designing the database structure.
C. The servlet would generate static HTML pages for user login.
This is incorrect because servlets typically generate dynamic content and manage logic rather than creating static HTML. Static pages are usually created separately and served by the server, while servlets dynamically process logic and generate responses based on input.
D. The servlet would execute SQL commands without any error handling.
This is incorrect because it represents poor programming practice. SQL execution should always be enclosed in error handling mechanisms (such as try-catch blocks) to ensure robustness and maintain application stability in case of runtime issues.
What is the primary characteristic of dynamic web pages?
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They are static and do not change content.
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They generate content based on user interactions or database queries.
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They require manual updates for content changes.
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They are only accessible through mobile devices.
Explanation
Correct Answer
B. They generate content based on user interactions or database queries.
Explanation
Dynamic web pages are built to respond to user input or other data-driven events. They generate content in real-time, often pulling information from a database or other backend systems. This enables a more interactive and personalized experience for users compared to static pages that always display the same content.
Why other options are wrong
A. They are static and do not change content.
This is incorrect because static pages remain the same unless manually updated, while dynamic pages change based on various conditions such as user actions or database updates. Dynamic pages are specifically characterized by their ability to adjust and present different content without needing manual edits to the HTML.
C. They require manual updates for content changes.
This is wrong because one of the key benefits of dynamic web pages is that they do not require manual updates. Content changes automatically based on scripts and back-end logic, reducing the need for direct human intervention.
D. They are only accessible through mobile devices.
This is incorrect as dynamic web pages are accessible through any device with internet access, including desktops, laptops, tablets, and mobile phones. Their functionality is not limited by the type of device being used.
Java programs communicate with databases using what API?
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JDBC.
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DBMS.
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RDBMS.
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Database.
Explanation
Correct Answer
A. JDBC.
Explanation
Java programs communicate with databases using the JDBC (Java Database Connectivity) API. JDBC provides a set of interfaces and classes that allow Java applications to connect to databases, execute SQL queries, and process the results. It is a standard API used for relational database interaction in Java, enabling developers to integrate databases into their Java applications easily.
Why other options are wrong
B. DBMS.
This is incorrect because DBMS refers to a Database Management System, which is the software used to manage databases. JDBC, on the other hand, is the API used by Java programs to interact with a DBMS.
C. RDBMS.
This is incorrect because RDBMS stands for Relational Database Management System. While JDBC is used to interact with RDBMS, RDBMS itself is not an API but rather a type of database management system.
D. Database.
This is incorrect because "Database" is simply the collection of data stored and managed by a DBMS. It is not an API. JDBC is the API that enables Java programs to communicate with databases.
Which of the following best defines a Database Management System (DBMS)?
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A programming language used for web development.
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Software that enables users to manage data and its schema.
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A type of hardware used for data storage.
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An application for designing user interfaces.
Explanation
Correct Answer
B. Software that enables users to manage data and its schema.
Explanation
A Database Management System (DBMS) is software that facilitates the creation, management, and manipulation of databases. It provides an interface for users to interact with the data stored in a database, including defining and managing data structures, storing data, and querying the database. The DBMS ensures data integrity, security, and efficient access to the data.
Why other options are wrong
A. A programming language used for web development
This is incorrect because a DBMS is not a programming language. It is software used for managing and interacting with databases, while programming languages like JavaScript, PHP, or Python are used to develop web applications.
C. A type of hardware used for data storage
This is incorrect because a DBMS is not hardware. While databases are stored on hardware like hard drives or servers, a DBMS is software that manages the data stored on that hardware.
D. An application for designing user interfaces
This is incorrect because a DBMS is focused on data management, not user interface design. User interface design is typically handled by different software tools or frameworks, not a DBMS.
In Java, a try-catch block is used to:
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Catch and handle exceptions
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Increase code readability
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Improve performance
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Declare variables
Explanation
Correct Answer
A. Catch and handle exceptions
Explanation
A try-catch block in Java is used to catch and handle exceptions that occur during the execution of a program. It allows developers to define what actions should be taken if an error or unexpected event occurs, preventing the program from crashing. The try block contains code that might throw an exception, and the catch block contains code to handle that exception.
Why other options are wrong
B. Increase code readability
While using try-catch blocks can lead to more structured code, their primary purpose is to handle exceptions, not specifically to improve readability. Readability is a side effect of proper exception handling.
C. Improve performance
A try-catch block does not improve performance. It only ensures that exceptions are properly managed. In fact, excessive use of exception handling can sometimes negatively impact performance, especially if exceptions are thrown and caught frequently.
D. Declare variables
Variables can be declared anywhere in Java, but try-catch blocks are not used for declaring variables. They are used specifically for handling exceptions.
Which of the following holds data retrieved from a database after you execute an SQL query using Statement objects?
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ResultSet
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JDBC driver
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Connection
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Statement
Explanation
Correct Answer
A. ResultSet
Explanation
In JDBC (Java Database Connectivity), the ResultSet is the object that holds data retrieved from a database after executing an SQL query using a Statement object. When you execute a query like SELECT using the Statement, the database sends the result back to the Java application, which is stored in a ResultSet. This object provides methods to iterate through the result set and retrieve data from the database, such as calling next(), getString(), or getInt() to access individual columns in the result.
Why other options are wrong
B. JDBC driver
The JDBC driver is responsible for establishing a connection between the Java application and the database. It does not hold the data returned from a query but facilitates communication between the application and the database.
C. Connection
A Connection is used to establish a connection to the database. It does not hold the data retrieved from a query but is needed to execute SQL statements that may return data.
D. Statement
A Statement object is used to send SQL queries to the database and execute them. It does not hold the results of those queries; rather, it returns the ResultSet object, which contains the retrieved data.
Mr. Angulo is an 89-year-old patient who was recently an inpatient for pneumonia and was bedridden for 1 week. He is now presenting dysuria, suprapubic tenderness accompanied by fever, and increased confusion. Based on his recent history, which of the following conditions may be developing?
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A Cystitis
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Distended bladder
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Prostate stones
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Subacute prostatitis
Explanation
Correct Answer: A. Cystitis
Explanation of Correct Answer
Older adults who are bedridden and recently hospitalized are at increased risk for urinary tract infections (UTIs), especially cystitis. Classic features include dysuria, suprapubic tenderness, fever, and confusion (delirium is a common presentation of infection in the elderly). This makes cystitis the most likely diagnosis.
Marie, 63 years old, is presenting with symptoms of postmenopausal bleeding and is diagnosed with endometrial cancer. Other than gender and age, which of the following can be contributing factors in the development of endometrial cancer? Select all that apply.
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Use of tamoxifen
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Use of hormonal contraception
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Diabetes
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Lynch syndrome
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Obesity
Explanation
Correct Answers: A. Use of tamoxifen, C. Diabetes, D. Lynch syndrome, E. Obesity
Explanation of Correct Answers
A. Use of tamoxifen
Tamoxifen, while an anti-estrogen in breast tissue, has partial estrogen agonist effects on the endometrium, increasing the risk of endometrial hyperplasia and cancer.
C. Diabetes
Diabetes is associated with insulin resistance and hyperinsulinemia, which promote cellular proliferation and increase the risk of endometrial cancer.
D. Lynch syndrome
This hereditary cancer syndrome (due to mismatch repair gene mutations) significantly increases the risk of endometrial cancer, alongside colorectal and other cancers.
E. Obesity
Obesity is one of the strongest risk factors. Excess adipose tissue increases estrogen production through peripheral aromatization, stimulating the endometrium and raising cancer risk.
Which SQL statement is used to delete data from a database?
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COLLAPSE
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DELETE
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REMOVE
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ERASE
Explanation
Correct Answer
B. DELETE
Explanation
The DELETE statement in SQL is used to remove data from a database table. It is typically followed by a WHERE clause to specify which rows to delete. If no WHERE clause is used, all rows in the table are deleted, but the structure of the table itself is unaffected. The DELETE command is different from DROP, which is used to remove entire tables or databases.
Why other options are wrong
A. COLLAPSE
This is incorrect because COLLAPSE is not a valid SQL command for deleting data. SQL does not have a COLLAPSE statement for data removal.
C. REMOVE
This is incorrect because REMOVE is not a standard SQL command. The correct command for deleting data is DELETE.
D. ERASE
This is incorrect because ERASE is not a valid SQL command for deleting data. The DELETE command should be used to remove data from a table.
What does CRUD stand for and CRUD operations on a table?
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Create, Request, User, Delete
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Create, Read, Update, Delete
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Cut, Read, Update, Destroy
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Create, Read, Undo, Delete
Explanation
Correct Answer
B. Create, Read, Update, Delete
Explanation
CRUD stands for Create, Read, Update, and Delete, which represent the basic operations that can be performed on data in a database table. These operations are fundamental to managing data within a relational database.
Create refers to adding new records or rows into a database table.
Read refers to retrieving or querying data from the database without altering it.
Update refers to modifying existing records in the database.
Delete refers to removing records from the database.
CRUD operations are essential for interacting with databases and managing data in a structured and consistent way.
Why other options are wrong
A. Create, Request, User, Delete
This option is incorrect because "Request" and "User" are not valid terms in the context of database operations. CRUD operations focus on Create, Read, Update, and Delete as the standard actions for database management.
C. Cut, Read, Update, Destroy
This option is incorrect because "Cut" and "Destroy" are not appropriate terms for database operations. "Cut" typically refers to a clipboard operation, and "Destroy" implies a more drastic action than the standard "Delete" operation, which is what is intended in CRUD.
D. Create, Read, Undo, Delete
This option is incorrect because "Undo" is not a standard term in database operations. The correct term for modifying data is "Update," not "Undo," which is more related to software features for reverting actions in applications rather than database operations.
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