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Top 100 Java / J2EE Questions Asked in Actual Interviews Reply to this Post
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How do I instantiate a bean whose constructor accepts parameters using the useBean tag?
http://www.coolinterview.com/interview/340


Replacing Characters in a String?
http://www.coolinterview.com/interview/341


Searching a String?
http://www.coolinterview.com/interview/342


Connecting to a Database and Strings Handling?
http://www.coolinterview.com/interview/343


What is a transient variable?
http://www.coolinterview.com/interview/344


What is the difference between Serializalble and Externalizable interface?
http://www.coolinterview.com/interview/345


How many methods in the Externalizable interface?
http://www.coolinterview.com/interview/346


How many methods in the Serializable interface?
http://www.coolinterview.com/interview/347


How to make a class or a bean serializable?
http://www.coolinterview.com/interview/348


What is the serialization?
http://www.coolinterview.com/interview/349


What are synchronized methods and synchronized statements?
http://www.coolinterview.com/interview/350


What is synchronization and why is it important?
http://www.coolinterview.com/interview/351


What is the purpose of finalization?
http://www.coolinterview.com/interview/352


What classes of exceptions may be caught by a catch clause?
http://www.coolinterview.com/interview/353


What is the difference between the Reader/Writer class hierarchy and the InputStream/OutputStream class hierarchy?
http://www.coolinterview.com/interview/354


What happens when a thread cannot acquire a lock on an object?
http://www.coolinterview.com/interview/355


What restrictions are placed on method overriding?
http://www.coolinterview.com/interview/356


What restrictions are placed on method overloading?
http://www.coolinterview.com/interview/357


How does multithreading take place on a computer with a single CPU?
http://www.coolinterview.com/interview/358


How is it possible for two String objects with identical values not to be equal under the == operator?
http://www.coolinterview.com/interview/359


How are this() and super() used with constructors?
http://www.coolinterview.com/interview/360


What class allows you to read objects directly from a stream?
http://www.coolinterview.com/interview/361


What is the ResourceBundle class?
http://www.coolinterview.com/interview/362


What interface must an object implement before it can be written to a stream as an object?
http://www.coolinterview.com/interview/363


What is Serialization and deserialization?
http://www.coolinterview.com/interview/364


What are the Object and Class classes used for?
http://www.coolinterview.com/interview/365


Can you write Java code for declaration of multiple inheritance in Java ?
http://www.coolinterview.com/interview/366


What do you mean by multiple inheritance in C++ ?
http://www.coolinterview.com/interview/367


Write the Java code to declare any constant (say gravitational constant) and to get its value.
http://www.coolinterview.com/interview/368


What are the disadvantages of using threads?
http://www.coolinterview.com/interview/369


Given two tables Student(SID, Name, Course) and Level(SID, level) write the SQL statement to get the name and SID of the student who are taking course = 3 and at freshman level.
http://www.coolinterview.com/interview/370


What do you mean by virtual methods?
http://www.coolinterview.com/interview/371


What do you mean by static methods?
http://www.coolinterview.com/interview/372


What do mean by polymorphism, inheritance, encapsulation?
http://www.coolinterview.com/interview/373


What are the advantages of OOPL?
http://www.coolinterview.com/interview/374


How many methods do u implement if implement the Serializable Interface?
http://www.coolinterview.com/interview/375


Are there any other 'marker' interfaces?
http://www.coolinterview.com/interview/376


What is the difference between instanceof and isInstance?
http://www.coolinterview.com/interview/377


Why do you create interfaces, and when MUST you use one?
http://www.coolinterview.com/interview/378


What's the difference between the == operator and the equals() method? What test does Object.equals() use, and why?
http://www.coolinterview.com/interview/379


Discuss the differences between creating a new class, extending a class and implementing an interface; and when each would be appropriate.
http://www.coolinterview.com/interview/380


Given a text file, input.txt, provide the statement required
http://www.coolinterview.com/interview/381


Name four methods every Java class will have.
http://www.coolinterview.com/interview/382


What does the "abstract" keyword mean in front of a method? A class?
http://www.coolinterview.com/interview/383


Does Java have destructors?
http://www.coolinterview.com/interview/384


Are constructors inherited? Can a subclass call the parent's class constructor? When?
http://www.coolinterview.com/interview/385


What synchronization constructs does Java provide? How do they work?
http://www.coolinterview.com/interview/386


Why "bytecode"? Can you reverse-engineer the code from bytecode?
http://www.coolinterview.com/interview/387


Does Java have "goto"?
http://www.coolinterview.com/interview/388


What does the "final" keyword mean in front of a variable? A method? A class?
http://www.coolinterview.com/interview/389


Access specifiers: "public", "protected", "private", nothing?
http://www.coolinterview.com/interview/442


What is JDBC? Describe the steps needed to execute a SQL query using JDBC.
http://www.coolinterview.com/interview/443


What is RMI?
http://www.coolinterview.com/interview/444


What are native methods? How do you use them?
http://www.coolinterview.com/interview/445


What does the keyword "synchronize" mean in java. When do you use it? What are the disadvantages of synchronization?
http://www.coolinterview.com/interview/446


How many different types of JDBC drivers are present? Discuss them.
http://www.coolinterview.com/interview/447


What is the difference between a Vector and an Array. Discuss the advantages and disadvantages of both?
http://www.coolinterview.com/interview/448


Describe java's security model.
http://www.coolinterview.com/interview/449


Java says "write once, run anywhere". What are some ways this isn't quite true?
http://www.coolinterview.com/interview/450


What is the difference between an Applet and an Application?
http://www.coolinterview.com/interview/451


How can you force all derived classes to implement a method present in the base class?
http://www.coolinterview.com/interview/452


What are abstract classes, abstract methods?
http://www.coolinterview.com/interview/453


What's the difference between == and equals method?
http://www.coolinterview.com/interview/454


Describe, in general, how java's garbage collector works?
http://www.coolinterview.com/interview/455


What is the difference between StringBuffer and String class?
http://www.coolinterview.com/interview/456


How can you achieve Multiple Inheritance in Java?
http://www.coolinterview.com/interview/457


What are interfaces?
http://www.coolinterview.com/interview/458


What are the main differences between Java and C++?
http://www.coolinterview.com/interview/459


In Java, You can create a String object as: String str = "abc"; & String str = new String("abc"); Why cant a button object be created as : Button bt = "abc" Why is it compulsory to create a button object as: Button bt = new Button("abc"); Why is this not compulsory in String's case?
http://www.coolinterview.com/interview/460


Why are Java ARchive (JAR) files important?
http://www.coolinterview.com/interview/461


What is it reflection (introspection) ? Why is reflection possible in the Java language?
http://www.coolinterview.com/interview/462


How to make application thread-safe ?
http://www.coolinterview.com/interview/463


What is it object serialization?
http://www.coolinterview.com/interview/464


What do you know about networking support in Java?
http://www.coolinterview.com/interview/465


What you know about Corba implementation in Java?
http://www.coolinterview.com/interview/466


What is Java Beans?
http://www.coolinterview.com/interview/467


Compare SWING components to standard AWT.
http://www.coolinterview.com/interview/468


What is layout manager ? How does it work?
http://www.coolinterview.com/interview/469


What is the purpose of the toolkit in the Abstract Window Toolkit (AWT)? How does AWT work?
http://www.coolinterview.com/interview/470


What are the differences between Java & C++ in terms of its features?
http://www.coolinterview.com/interview/471


Is the ternary operator written x : y ? z or x ? y : z ?
http://www.coolinterview.com/interview/472


What is the List interface?
http://www.coolinterview.com/interview/473


What is the difference between an if statement and a switch statement?
http://www.coolinterview.com/interview/474


What are the problems faced by Java programmers who don't use layoutmanagers?
http://www.coolinterview.com/interview/475


What are the two basic ways in which classes that can be run as threads may be defined?
http://www.coolinterview.com/interview/476


What are synchronized methods and synchronized statements?
http://www.coolinterview.com/interview/477


Which Component subclass is used for drawing and painting?
http://www.coolinterview.com/interview/478


What methods are used to get and set the text label displayed by a Buttonobject?
http://www.coolinterview.com/interview/479


What method must be implemented by all threads?
http://www.coolinterview.com/interview/480


When is an object subject to garbage collection?
http://www.coolinterview.com/interview/481


Can an unreachable object become reachable again?
http://www.coolinterview.com/interview/482


How does a try statement determine which catch clause should be used tohandle an exception?
http://www.coolinterview.com/interview/483


What are the Object and Class classes used for?
http://www.coolinterview.com/interview/484


What modifiers may be used with a top-level class?
http://www.coolinterview.com/interview/485


What is a Java package and how is it used?
http://www.coolinterview.com/interview/486


What is the purpose of a statement block?
http://www.coolinterview.com/interview/487


What is the difference between the prefix and postfix forms of the ++ operator?
http://www.coolinterview.com/interview/488


Can try statements be nested?
http://www.coolinterview.com/interview/489


To what value is a variable of the boolean type automatically initialized?
http://www.coolinterview.com/interview/490


What is the difference between a public and a non-public class?
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