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Thursday, March 1, 2007

Top 100 Java / J2EE Questions Asked in Actual Interviews

  • How do I instantiate a bean whose constructor accepts parameters using the useBean tag?
    http://www.coolinte rview.com/ interview/ 340

  • Replacing Characters in a String?
    http://www.coolinte rview.com/ interview/ 341

  • Searching a String?
    http://www.coolinte rview.com/ interview/ 342

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

  • What is a transient variable?
    http://www.coolinte rview.com/ interview/ 344

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

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

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

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

  • What is the serialization?
    http://www.coolinte rview.com/ interview/ 349

  • What are synchronized methods and synchronized statements?
    http://www.coolinte rview.com/ interview/ 350

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

  • What is the purpose of finalization?
    http://www.coolinte rview.com/ interview/ 352

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

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

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

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

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

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

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

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

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

  • What is the ResourceBundle class?
    http://www.coolinte rview.com/ interview/ 362

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

  • What is Serialization and deserialization?
    http://www.coolinte rview.com/ interview/ 364

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

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

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

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

  • What are the disadvantages of using threads?
    http://www.coolinte rview.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.coolinte rview.com/ interview/ 370

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

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

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

  • What are the advantages of OOPL?
    http://www.coolinte rview.com/ interview/ 374

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

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

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

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

  • What's the difference between the == operator and the equals() method? What test does Object.equals( ) use, and why?
    http://www.coolinte rview.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.coolinte rview.com/ interview/ 380

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

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

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

  • Does Java have destructors?
    http://www.coolinte rview.com/ interview/ 384

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

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

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

  • Does Java have "goto"?
    http://www.coolinte rview.com/ interview/ 388

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

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

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

  • What is RMI?
    http://www.coolinte rview.com/ interview/ 444

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

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

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

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

  • Describe java's security model.
    http://www.coolinte rview.com/ interview/ 449

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

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

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

  • What are abstract classes, abstract methods?
    http://www.coolinte rview.com/ interview/ 453

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

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

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

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

  • What are interfaces?
    http://www.coolinte rview.com/ interview/ 458

  • What are the main differences between Java and C++?
    http://www.coolinte rview.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.coolinte rview.com/ interview/ 460

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

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

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

  • What is it object serialization?
    http://www.coolinte rview.com/ interview/ 464

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

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

  • What is Java Beans?
    http://www.coolinte rview.com/ interview/ 467

  • Compare SWING components to standard AWT.
    http://www.coolinte rview.com/ interview/ 468

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

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

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

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

  • What is the List interface?
    http://www.coolinte rview.com/ interview/ 473

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

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

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

  • What are synchronized methods and synchronized statements?
    http://www.coolinte rview.com/ interview/ 477

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

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

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

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

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

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

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

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

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

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

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

  • Can try statements be nested?
    http://www.coolinte rview.com/ interview/ 489

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

  • What is the difference between a public and a non-public class?
    http://www.coolinte rview.com/ interview/ 491
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