• 11 March

    serialVersionUID in java Serialization

    This is 2nd part of java Serialization tutorial Java Serialization Tutorial: Serialization in java Java Serialization interview questions and answers serialversionuid in java serialization externalizable in java Transient keyword in java Difference between Serializable and Externalizable in Java serialVersionUID is used to ensure that same class(That was used during Serialization) is loaded during Deserialization.serialVersionUID is […]

  • 09 March

    Serialization in java

    This is 1st part of java Serialization tutorial. Java Serialization Tutorial: Serialization in java Java Serialization interview questions and answers serialversionuid in java serializationexternalizable in java Transient keyword in java Difference between Serializable and Externalizable in Java Java provides mechanism called serialization to persists java objects in a form of ordered or sequence of bytes […]

  • 01 March

    Template method design pattern in java

    CodeProjectTemplate method pattern is a behavioral design pattern which provide base method for algorithm,called template method which defers some of its steps to subclasses So algorithm structure is same but some of its steps can be redefined by subclasses according to context. Template means Preset format like HTML templates which has fixed preset format.Similarly in […]

  • 27 February

    Observer design pattern in java

    As the name suggests it is used for observing some objects.Observer watch for any change in state or property of subject.Suppose you are interested in particular object and want to get notified when its state changes then you observe that object and when any state or property change happens to that object,it get notified to […]

  • 26 February

    Difference between Comparator and Comparable in java

    CodeProject One of the common interview question is “What are differences between Comparator and Comparable”. or “How will you sort collection of employee objects by its id or name”.For that we can use two interfaces.i.e. Comparator and Comparable.Before we actually see differences,let me give you brief introduction of both. Comparable interface: Class whose objects to […]

  • 18 February

    JAXB tutorial

    What is JAXB? JAXB stands for Java architecture for XML binding.It is used to convert XML to java object and java object to XML.JAXB defines an API for reading and writing Java objects to and from XML documents.Unlike SAX and DOM,we don’t need to be aware of XML parsing techniques. There are two operations you […]

  • 17 February

    Difference between ArrayList and Vector in java

    One of the common interview question is “What is difference between ArrayList and Vector”.Before we actually see differences,let me give you brief introduction of both. ArrayList ArrayList is implementation of list interface. ArrayList is not synchonized(so not thread safe) ArrayList is implemented using array as internal data structure.It can be dynamically resized . ArrayList increases […]

  • 17 February

    Difference between HashMap and HashSet in java

    One of the common interview question is “What is difference between HashMap and HashSet”..Before we actually see differences,let me give you brief introduction of both. Java HashMap: HashMap in java How HashMap works in java hash and indexfor method in HashMap hashcode and equals method in java How to sort HashMap by keys and values […]

  • 17 February

    Difference between Hashtable and HashMap in java

    One of the common interview questions is “What are differences between Hashtable and HashMap“.When I started using them, I used any of them irrespective of their differences.Afterward I found noticeable differences between them which can affect your performance of the application. .Before we actually see differences, let me give you a brief introduction of both. […]