There are many typical questions in interview that can trick you up but with the bit of preplanned you can learn to answer with confidence

Here are some Typical Interview Questions

1. What is your biggest weakness?

The braided question which is best handled by picking something you have made protest step to address. For Example

1. Pick something you have regressed
2. Use a recent example
3. Weakness can be viewed as strength.

Note:
Dont say that i dont have any weakness do answer this question and always answer this question

2. Why should we hire you?

Here we need follow some steps

1. First of all, check the job description
2. I have a unique combination of strong technical skills and the ability to build long-term customer relationships.
3. Give a good recent examples.
4. Given the apportunity, i could bring this success to your company.

3. Why do you want the job?

1. Prepare the answer carefully. Give some good points.
2. Do your homework on the company
3. Match your goals to the company goals.

4. Tell me about yourself?
This often asked for everyone who goes to company for an interview. So prepare well for this question.

Q1. How could Java classes direct program messages to the system console, but error messages, say to a file?

A. The class System has a variable out that represents the standard output, and the variable err that represents the standard error device. By default, they both point at the system console. This how the standard output could be re-directed:
Stream st = new Stream(new FileOutputStream(”output.txt”)); System.setErr(st); System.setOut(st);

Q2. What’s the difference between an interface and an abstract class?

A. An abstract class may contain code in method bodies, which is not allowed in an interface. With abstract classes, you have to inherit your class from it and Java does not allow multiple inheritance. On the other hand, you can implement multiple interfaces in your class.

Q3. Why would you use a synchronized block vs. synchronized method?
A. Synchronized blocks place locks for shorter periods than synchronized methods.

Q4. Explain the usage of the keyword transient?

A. This keyword indicates that the value of this member variable does not have to be serialized with the object. When the class will be de-serialized, this variable will be initialized with a default value of its data type (i.e. zero for integers).

Q5. How can you force garbage collection?

A. You can’t force GC, but could request it by calling System.gc(). JVM does not guarantee that GC will be started immediately.

Q6. How do you know if an explicit object casting is needed?

A. If you assign a superclass object to a variable of a subclass’s data type, you need to do explicit casting. For example:
Object a; Customer b; b = (Customer) a;
When you assign a subclass to a variable having a supeclass type, the casting is performed automatically.

Q7. What’s the difference between the methods sleep() and wait()

A. The code sleep(1000); puts thread aside for exactly one second. The code wait(1000), causes a wait of up to one second. A thread could stop waiting earlier if it receives the notify() or notifyAll() call. The method wait() is defined in the class Object and the method sleep() is defined in the class Thread.

Q8. Can you write a Java class that could be used both as an applet as well as an application?

A. Yes. Add a main() method to the applet.

Q9. What’s the difference between constructors and other methods?

A. Constructors must have the same name as the class and can not return a value. They are only called once while regular methods could be called many times.

Q10. Can you call one constructor from another if a class has multiple constructors
A. Yes. Use this() syntax.

Q11. Explain the usage of Java packages.

A. This is a way to organize files when a project consists of multiple modules. It also helps resolve naming conflicts when different packages have classes with the same names. Packages access level also allows you to protect data from being used by the non-authorized classes.

Q12. If a class is located in a package, what do you need to change in the OS environment to be able to use it?

A. You need to add a directory or a jar file that contains the package directories to the CLASSPATH environment variable. Let’s say a class Employee belongs to a package
com.xyz.hr; and is located in the file c:\dev\com\xyz\hr\Employee.java. In this case, you’d need to add c:\dev to the variable CLASSPATH. If this class contains the method main(), you could test it from a command prompt window as follows:
c:\>java com.xyz.hr.Employee

Q13. What’s the difference between J2SDK 1.5 and J2SDK 5.0?

A.There’s no difference, Sun Microsystems just re-branded this version.

Q14. What would you use to compare two String variables - the operator == or the method equals()?

A. I’d use the method equals() to compare the values of the Strings and the == to check if two variables point at the same instance of a String object.

Q15. Does it matter in what order catch statements for FileNotFoundException and IOExceptipon are written?

A. Yes, it does. The FileNoFoundException is inherited from the IOException. Exception’s subclasses have to be caught first.

Q16. Can an inner class declared inside of a method access local variables of this method?

A. It’s possible if these variables are final.

Q17. What can go wrong if you replace && with & in the following code:
String a=null; if (a!=null && a.length()>10) {…}

A. A single ampersand here would lead to a NullPointerException.

Q18. What’s the main difference between a Vector and an ArrayList

A. Java Vector class is internally synchronized and ArrayList is not.

Q19. When should the method invokeLater()be used?

A. This method is used to ensure that Swing components are updated through the event-dispatching thread.

Q20. How can a subclass call a method or a constructor defined in a superclass?

A. Use the following syntax: super.myMethod(); To call a constructor of the superclass, just write super(); in the first line of the subclass’s constructor.

For senior-level developers:
Q21. What’s the difference between a queue and a stack?

A. Stacks works by last-in-first-out rule (LIFO), while queues use the FIFO rule

Q22. You can create an abstract class that contains only abstract methods. On the other hand, you can create an interface that declares the same methods. So can you use abstract classes instead of interfaces?

A. Sometimes. But your class may be a descendant of another class and in this case the interface is your only option.

Q23. What comes to mind when you hear about a young generation in Java?

A. Garbage collection.

Q24. What comes to mind when someone mentions a shallow copy in Java?

A. Object cloning.

Q25. If you’re overriding the method equals() of an object, which other method you might also consider?

A. hashCode()

Q26. You are planning to do an indexed search in a list of objects. Which of the two Java collections should you use:ArrayList or LinkedList?

A. ArrayList

Q27. How would you make a copy of an entire Java object with its state?

A. Have this class implement Cloneable interface and call its method clone().

Q28. How can you minimize the need of garbage collection and make the memory use more effective?

A. Use object pooling and weak object references.

Q29. There are two classes: A and B. The class B need to inform a class A when some important event has happened. What Java technique would you use to implement it?

A. If these classes are threads I’d consider notify() or notifyAll(). For regular classes you can use the Observer interface.

Q30. What access level do you need to specify in the class declaration to ensure that only classes from the same directory can access it?

A. You do not need to specify any access level, and Java will use a default package access level.

1. I have so many interests. How does one with a liberal arts education and diverse interests plan a career? What positions are good entry-level opportunities?

2. How will a liberal arts degree be an advantage in the world of work?

3. What are the benefits of a liberal arts degree in the short-term and long-term regarding career choices and advancement?

4. How does one market a liberal arts degree to employers?

5. How did this type of work interest you and how did you get started?

6. How did you get your first job? What jobs and experiences have led you to your present position?

7. Can you suggest some ways a student could obtain necessary experience?

8. If you could do things all over again, would you choose the same path for yourself? Why? What
would you change?

9. How has your job affected your lifestyle?

10. Would you recommend that I pursue a graduate degree?

11. Does your work relate to any experiences or studies you had in college?

12. How well did your college experience prepare you for your career?

13. What courses and experiences have proven to be the most valuable to you in your work? What would you recommend for me?

14. How important are grades/GPA for obtaining a job in this field?

15.How do you think my university’s reputation is viewed when it comes to hiring?

16. How do you think graduation from a liberal arts university is viewed when it comes to hiring?

17. How did you prepare for this work? If you were entering this career today, would you change your preparation in any way to facilitate entry?

18. What abilities or personal qualities do you believe contribute most to success in this field/job?

19. What are the typical entry-level job titles and functions? What entry level jobs are best for learning as much as possible?

20. Do you have any advice for someone interested in this field/job? Are there any written materials you suggest I read?

21. Which professional journals and organizations would help me learn more about this field?

22. What kinds of experience, paid or unpaid, would you encourage for anybody pursuing a career in this field?

23. What special advice do you have for a student seeking to qualify for this position?

24. What particular skills or talents are most essential to be effective in your job? How did you learn these skills? Did you enter this position through a formal training program? How can I evaluate whether or not I have the necessary skills for a position such as yours?

25. Do you have any special words of encouragement or warnings as a result of your experiences?

26. These are my strongest assets (skills, areas of knowledge, personality traits and
values ) : ___________________________________ . Where would they fit in this field? Where would they be helpful in an organization? Where might they fit in other fields? Where might they be helpful in other organizations?

27. How would you assess the experience I’ve had so far in terms of entering this field?

28. Do you have any other networking advice for me?