Which of these is not a type of memory area in the Java Virtual Machine (JVM)?
- Cache
- Heap
- Registers
- Stack
Cache is not a type of memory area in the Java Virtual Machine (JVM). The primary memory areas in JVM include Heap, Stack, and Registers.
Using _________ instead of concatenation in loops for string manipulation enhances performance in servlets.
- CharArray
- String
- StringBuffer
- StringBuilder
Using StringBuilder instead of concatenation in loops for string manipulation enhances performance in servlets because StringBuilder is more efficient in handling string concatenation operations.
In high-performance servlets, _________ pattern can be used to manage resource-intensive objects.
- Command
- Flyweight
- Observer
- Singleton
In high-performance servlets, the Flyweight pattern can be used to manage resource-intensive objects efficiently by sharing common parts of state among multiple objects.
For optimal servlet performance, session data should be kept to a minimum, utilizing ________ for state management.
- Cookies
- Hidden Fields
- Session Tracking
- URL Rewriting
For optimal servlet performance, session data should be kept to a minimum, utilizing Session Tracking for state management.
To improve scalability, servlets can delegate database reads to ________ instances.
- Observer
- Singleton
- Stateful
- Stateless
To improve scalability, servlets can delegate database reads to Stateless instances, as they do not maintain client-specific state between method calls.
A servlet handling massive data queries is experiencing performance issues. What optimization technique should be prioritized?
- Caching results
- Increasing server hardware
- Minifying CSS and JavaScript files
- Optimizing database queries
Optimizing database queries would be a key strategy in this scenario, as it directly addresses the performance issues associated with handling massive data queries.
What is a memory leak in the context of Java programming?
- A memory leak occurs when a program allocates memory but forgets to deallocate it, leading to a gradual reduction in available memory.
- A memory leak occurs when a program deallocates memory properly, ensuring optimal memory usage.
- Memory leaks are intentionally created to enhance program performance.
- Memory leaks only occur in languages other than Java.
A memory leak in Java programming happens when the program allocates memory but forgets to deallocate it, resulting in a gradual reduction in available memory.
Can session tracking be implemented using hidden form fields?
- Depends on the browser
- No
- Possible only in HTTPS
- Yes
Session tracking can be implemented using hidden form fields by including the session identifier in the form, allowing it to be sent back to the server with each form submission.
The ServletContext is shared across multiple servlets within a __________.
- request
- server
- session
- web application
The ServletContext is shared across multiple servlets within a web application.
What is URL rewriting in the context of session tracking?
- Appending a random string to the URL for session identification.
- Creating a new URL for each session.
- Hiding session information in the URL.
- Modifying the URL to include session information.
URL rewriting in session tracking involves modifying the URL to include session information. This enables the server to identify the client's session when processing subsequent requests.