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Object Oriented Programming?
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Class, Constructor and Primitive Data Types?
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Difference between procedural and object-oriented programs?
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Encapsulation, Inheritance and Polymorphism?
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Difference between an Interface and an Abstract class
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| Difference between Assignment and Initialization? |
| The purpose of garbage collection in Java, and when is it used? |
| Synchronization in respect to multithreading. |
| Different way of using thread? |
| Pass by reference vs pass by value? |
| HashMap and Map? |
| Difference between HashMap and HashTable? |
| Difference between Vector and ArrayList? |
| Difference between Swing and Awt? |
| Difference between a constructor and a method? |
| Iterator? |
| Abstract class? |
| Static in java? |
| Keyword final? |
| If the main method is declared as private? |
| If the static modifier is removed from the signature of the main method? |
| If I write static public void instead of public static void? |
| if I do not provide the String array as the argument to the method? |
| Can an application have multiple classes having main method? |
| Overriding? |
| Different types of inner classes? |
| Type of parameter passing does Java support? |
| Objects are passed by value or by reference? |
| Serialization? |
| HSerializing an object to a file? |
| Common usage of serialization? |
| Externalizable interface? |
| Java provide any construct to find out the size of an object? |
| wrapper classes? |
| need wrapper classes? |
| What are checked exceptions? |
| Runtime exceptions? |
| Difference between error and an exception? |
| Creating custom exceptions? |
| Different ways to handle exceptions? |
| Observer and Observable used? |
| Synchronization? Importance of Synchronization? |
| Handling integer overflows and underflows? |
| Difference between preemptive scheduling and time slicing? |
| Use of this() and super() with constructors? |
| Synchronized methods and synchronized statements? |
| Steps in the JDBC connection? |
| Method must be implemented by all threads? |
| Synchronized methods and synchronized statements? |
| Modifiers allowed for methods in an Interface? |
| Alternatives to inheritance? |
| The use of bin and lib in JDK? |
| Casting? |
| UNICODE? |
| Method overloading and method overriding? |
| Reflection package |
| Difference between Integer and int? |
| Difference between String and String Buffer? |
| Difference between process and thread? |
| Deadlock? |
| Daemon thread and which method is used to create the daemon thread? |
| Difference between applications and applets? |
| Source and listener? |
| Adapter Class? |
| Controls? Different types of controls in AWT? |
| Difference between Scrollbar and Scrollpane? |
| Layout Manager? Types of Layout Manager in Java AWT? |
| Wrapper Classes? |
| Vector, Hashtable, LinkList and Enumeration? |
| Set vs. List? |
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| Reader/Writer vs. InputStream/OutputStream? |
| I/O filter? |
| Serializaion and Deserialization? |
| JDBC? |
| JDBC Drivers? |
| JDBC vs ODBC? |
| Servlet? |
| Transient Variable? |
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