Siemens Java Interview Questions

  1.  What’s encapsulation and example and advantages?

  2.    What’s Abstraction?

  3.    Explain interface and polymorphism?

  4.    Explain Serialization and write the program?

  5.    What’s marker interface?

  6.    How to clone the object?

  7.    Draw exception hierarchy?

  8.    Explain synchronized block and method?

  9.    Can we override main method? If we override which method will be invoked by jvm?

  10.  Write the program to sort the given integer array?

  11. Difference between String, StringBuffer and StringBuilder?

  12. How to create the new thread and write the program?

  13. Explain Dynamic binding?

  14. Difference between overloading and overriding?

  15.  What’s the use of concurrent packages?

  16.  How to create the custom exception?

  17. Exception handling hierarchy?

  18. Whats the use of finally block?

  19. When the finally block will not execute?

  20. When we have go for IS-A relationship and has-A relationship?

  21. Draw the XML notation for association composition?

  22. Write the code for reflection?

  23. Difference between HashMap and HashTable?

  24.  What’s generics and write the example for generic method?

  25. Advantages of generics?

  26.  How to join two threads?

  27. Write the code to solve producer and consumer issue?

  28. Write the code for builder design pattern?

  29. What’s design principles?

  30.  Whats enum? Can we create the method and constructor inside the enum?

  31.  Can we override the static method?

  32.  Can we create the enum, inside and outside of the class?

  33.  Difference between throw and throws keyword?

  34. Different types of annotation in java?

  35.  Whats the use of volatile keyword?

  36. What’s the use of transient keyword?

  37.  Explain Object oriented design principles?


We recommend you take Big Data Hadoop class room training at eMexo Technologies in electronic city, Bangalore to learn more about Big Data Hadoop.

Wells Fargo Java Interview Questions

 1.  What is command design patter? Example in JDK.

      2. Decorator design patter and implementation in JDK?

      3. Thread pool uses which design pattern?

      4. Can we handle Error in catch block? Can we handle OutOfMemoryError in catch block? If yes why we not do in general uses?

      5. How to log every time a object is getting GC ? finalize. Does finalize block always run before GC ?

      6. When finally block does not run ? Like system.exit(0)

      7. Write a programme which sum number from 10*10 dimension array ? We need to do in fastest way.  If we use multiple thread and a particular thread is stuck how we make sure other thread run smoothly

      8. Write a programme to create a cache where object is removed after certain period of time ?

      9. Questions of multiple thread and lock of different methods (static and non-static) ?

      10. Question on semaphore countdown latch ?

      11. How hashmap and concurrent hash map work ? what is concurrency level in hash map?

      12. What is concurrency modification exception? and detail when it occur in list?

  

We recommend you take Big Data Hadoop class room training at eMexo Technologies in electronic city, Bangalore to learn more about Big Data Hadoop.

Cognizant Java Interview Questions

  1.    Write the code the given two numbers are isomarohic?

       2.    Write the code to find the occurrence of each character?

       3.    Elements in the list are ordered or not?

       4.    How to add the method in interface without affecting the existing implementations?




      

     We recommend you take Big Data Hadoop class room training at eMexo Technologies in electronic city, Bangalore to learn more about Big Data Hadoop.

Sapient Java Interview Questions

  1.    Difference between Runnable and Callable interface?

       2.    Difference between execute and submit method?

       3.    Write the program first thread returns odd number and second thread return even    number and the output should in sequential manner?

        4.    Write the example for Blocking queue?




     


     We recommend you take Big Data Hadoop class room training at eMexo Technologies in electronic city, Bangalore to learn more about Big Data Hadoop.

Robert Bosch Java Interview Questions

  1.    Write the program to reverse the string without modify the special character?

        2.    Write the program to compare the object using comparable interface?

        3.    Write the program for singleton?

        4.    Explain concurrent packages?

        5.    Difference between @inject and @service annotation

        6.    Advantages of microservice and cassendra?

        7.    Write the program for executor library?

        8.    Whats inner join?

        9.    Write the program for rest controller?

        10. Can we have multiple session factory in Hibernate?

        11. Explain IOC container and dependency injection?

        12. How many test cases you will write to test a method?

We recommend you take Big Data Hadoop class room training at eMexo Technologies in electronic city, Bangalore to learn more about Big Data Hadoop.

Paypal Java Interview Questions

1. What's the difference between class diagram and sequence diagram?
2. How many types of design patterns are available?
3. What's the use UML diagram?
4. How to create singleton design Pattern?
5. Which tool is used to create UML diagram?
6. What's Immutable object?
7. How to create custom Immutable class?
8. What's the difference between String and StringBuffer?
9. What's the difference between Factory and AbstractFactory?
10. What's the use of JUnit?
11. What are the annotations are available in JUnit testing?
12. What are the assert methods are available in Assert class in Junit?
13. What's difference b/w JUnit and TestNG?
14. What's the use of finally block?
15. Can we use try with finally block?
16. If we use System.exit in catch block finally will execute or not?
17. What's Serialization?
18. What's marker interface?
19. What's the use of marker interface?
20. What's the difference between wait and sleep?
21. What's the use of notify and notifyAll?
22. What's the difference between ArrayList and LinkedList?
23. What's the use of namespace?
24. Can we use the private Constructor?
25. What's Constructor overloading?
26. What's runtime polymorphism?
27. What's static binding and dynamic binding?
28. What's the use of transient keyword?
29. What are the steps to connect DB using JDBC?
30. What's the difference between statement and prepared statement?
31. What's your day to day activity?
32. Does Java support call by value or call by reference?

     We recommend you take Big Data Hadoop class room training at eMexo Technologies in electronic city, Bangalore to learn more about Big Data Hadoop.

Dell Java Interview Questions

1. What's Generics?
2. What's the use of Generics Frameworks?
3. What's the use of Generic Class and Methods?
4. What's Java collection?
5. What are the Advantage of Collection?
6. Explain Different types of collection?
7. Explain HashMap internal mechanism?
8. Explain Set internal mechanism?
9. Explain Equals and Hashcode internal mechanism?
10. How to store duplicate value in HashSet?
11. What is marker interface and use of the marker interface?
12. What's Object Serialization?
13. What's the use of serialVersionUid?
14. What is design pattern?
15. What are the different types of design patterns are available in Java?
16. How to create singleton design pattern?
17. How to use Generics in Factory design pattern?
18. How to use same singleton instance in different JVM?
19. What's the difference between Comparator and Comparable?
20. What's the difference between Association, Aggregation and Composition?
21. What's Object Cloning?

     

     We recommend you take Big Data Hadoop class room training at eMexo Technologies in electronic city, Bangalore to learn more about Big Data Hadoop.