JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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How Struts control data flow?


Answer:

Struts implements the MVC pattern through the use of ActionForwards and ActionMappings to keep control-flow decisions out of presentation layer.

When you deploy your struts application:

Having received the request the ActionServlet locates the correct Form Bean from the struts-config.xml. The ActionServlet invokes the FormBean Validator logic. If the Form Bean finds any error, it populates the ActionError Object

Using the Struts-Config.xml the ActionServlet locates and invokes the Action Class which invokes the model and returns an ActionForward object to the ActionServlet.

The ActionServlet uses the ActionForward Object to dispatch to the correct view component.

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List Of Java Interview Questions:

  1. Previous set of java interview questions
  2. What is difference between Lambda Expression and Anonymous class?
  3. What is HTTP basic authentication?
  4. What is functional interface in java?
  5. What is the difference between HTTP methods GET and POST?
  6. What is difference between CountDownLatch and CyclicBarrier in Java?
  7. Can Enum extend any class in Java?
  8. Can Enum implements any interface in Java?
  9. Can we have constructor in abstract class?
  10. What is MVC pattern?
  11. What is ActionServlet in struts?
  12. What is the difference between servlet & Filter?
  13. What is ActionMapping in struts?
  14. What is the difference between application server and web server?
  15. What is the difference between JPA and Hibernate?
  16. What is difference between the Value Object and JDO?
  17. How Struts control data flow?
  18. What is Spring?
  19. What is Dependency Injection?
  20. What are the different types of dependency injections in spring?
  21. What is BeanFactory in Spring?
  22. What is difference between BeanFactory and ApplicationContext in spring?
  23. How to make a bean as singleton in spring?
  24. What is IOC or inversion of control?
  25. What are different types of spring auto-wiring modes?
  26. What are the limitations and disadvantages of spring autowiring?
  27. Is the spring singleton bean thread safe?
  28. Why ConcurrentHashMap is faster than Hashtable in Java?
  29. What is the difference between ConcurrentHashMap and Hashtable in Java?
  30. Difference between ConcurrentHashMap and Collections.synchronizedMap(Map)?
  31. What is the difference between ORM, JPA and Hibernate?
  32. What is stream pipelining in Java 8?
  33. What is interface default method in java 8?
  34. Java-8: Interface with default methods vs Abstract class.
  35. What is @SpringBootApplication annotation in Spring boot project?
  36. What Embedded Containers Does Spring Boot Support?
  37. What are the advantages and disadvantages of Spring Boot?
  38. What is Spring Boot Actuator?
  39. What is Spring Boot Initializr?
  40. How does Maven resolve version conflicts of dependencies?
  41. How to reload Spring Boot Application without restarting server?
  42. What is the difference between Spring Boot and the Spring framework?
  43. What are the key components of Spring Boot framework?
  44. What are the different types of bean scope in Spring framework?
  45. What are the standard Spring build-in events?
  46. What is Spring IoC container?
  47. Differences between BeanFactory and the ApplicationContext in Spring framework.
  48. Difference between constructor injection and setter injection in Spring.
  49. How Java-8 Streams differ from collections
  50. What are the various ways to obtain Streams in Java-8?
  51. List Java-8 Streams intermediate operations.
  52. List Java-8 Streams terminal operations.
  53. Can we reuse Java-8 Streams?
  54. Difference between map and flatMap methods in Java 8
  55. What is the difference between Closure and Lambda in Java 8?
  56. Does Java 8 Lambda supports recursive call?
  57. Can Java 8 default methods override equals, hashCode and toString?
  58. Hibernate Eager vs Lazy Fetch Type
  59. What is POJO?
  60. What is HQL (Hibernate Query Language)?
Knowledge Centre
Difference between Enumeration and Iterator
The functionality of Enumeration and the Iterator are same. You can get remove() from Iterator to remove an element, while while Enumeration does not have remove() method. Using Enumeration you can only traverse and fetch the objects, where as using Iterator we can also add and remove the objects. So Iterator can be useful if you want to manipulate the list and Enumeration is for read-only access.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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