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How many ways to create a Thread in Java ?
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==============================
Java Interview Questions
==============================
Q. How many ways to create a thread in Java ?
ANS
----------------
There are two ways to create a thread in Java:
1. Extending the Thread class:
- Create a subclass of Thread
- Override the run() method
- Create an instance of the subclass and start the thread
2. Implementing the Runnable interface:
- Create a class that implements Runnable
- Implement the run() method
- Create a Thread object and pass the Runnable object to it
- Start the thread
short example of both ways:
==============================
Extending Thread:
==============================
public class MyThread extends Thread {
public void run() {
System.out.println("Hello from thread!");
}
}
MyThread thread = new MyThread();
thread.start();
Implementing Runnable:
==============================
public class MyRunnable implements Runnable {
public void run() {
System.out.println("Hello from thread!");
}
}
Runnable runnable = new MyRunnable();
Thread thread = new Thread(runnable);
thread.start();
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Spring Boot Question 🍃
Which annotation is used to inject externalised properties?
a)@RequestParam
b)@Value
c)@Autowired
d)@Configuration
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Spring Boot Question 🍃
What is default logging framework used by Spring boot ❓
a) Log4j
b) Java util logging (JLU)
c) Logback
d) Apache commons Logging
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Spring Boot Question 🍃
What is default database used by spring boot application ❓
a) MySql
b) PostgreSQL
c) H2
d) Oracle
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Spring Boot Question 🍃
What is the default port number used by spring boot embedded Tomcat Server❓
a) 8080
b) 3306
c) 8081
d) 3000
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Spring Boot Question 🍃
The property marked with ____ annotation will not be persisted❓
a) @Data
b) @Volatile
c) @Transient
d) None of the above
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Here are some common errors that can occur in a web application.
==============================
1. 404 Not Found: The requested resource (page, image, etc.) cannot be found on the server.
2. 500 Internal Server Error: A generic error indicating that the server encountered an unexpected condition that prevented it from fulfilling the request.
3. 403 Forbidden: The server is refusing access to the requested resource, often due to permission or authentication issues.
4. 401 Unauthorized: The client lacks valid authentication credentials to access the requested resource.
5. 408 Request Timeout: The server took too long to respond, and the client timed out.
6. 422 Unprocessable Entity: The request was well-formed, but the server couldn't process it due to semantic errors.
7. 413 Payload Too Large: The request payload exceeds the server's limits.
8. 429 Too Many Requests: The client sent too many requests in a short period, and the server is rate-limiting.
9. 503 Service Unavailable: The server is currently unable to handle requests due to maintenance or overload.
10. SQL Exception: Errors related to database queries, such as syntax errors or connection issues.
11. NullPointerException: A programming error where a null value is encountered where an object is expected.
12. ClassCastException: A programming error where an object is cast to the wrong type.
13. IllegalArgumentException: A programming error where an illegal or invalid argument is passed to a method.
14. IOException: Errors related to input/output operations, such as file not found or network connection issues.
15. TimeoutException: A programming error where a operation takes longer than expected and times out.
Note: This is not an exhaustive list, but it covers some common errors that can occur in web applications.
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Which of the following options is correctly formatted to ensure a database is created if it does not already exist?
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B. CreateDatabaseifnotexist = true
C. createdatabaseifnotExist = true
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👨💻 SQL Quiz
Which SQL keyword is used to retrieve data from database ?
A. GET
B. SELECT
C. FETCH
D. SEARCH
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