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JDBC stands for Java DataBase Connectivity and is a technology for database connectivity from java program. JDBC is a collection of multiple interfaces and classes which provides methods for database connection and operations. Operations include executing SQL queries for fetching records, inserting and updating or deleting data from a database table directly from a java program. For performing any operation on a database using JDBC, requires some steps. They are :Read More →

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JDBC is an acronym for Java DataBase Connectivity and is a technology for interaction of java application and its objects with a database. Hibernate on the other hand is a java based framework which also facilitates the interaction of application objects with a database but in a completely different approach. Below are listed some differences between the two. The points do not intend to indicate which is better, they just compare the various aspects of the method of operation of both. The headers before each row indicate the area of comparison.Read More →

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A typical java application uses some values which are not suitable to be given in code such as log generation path, output location, configuration file path, timeout values etc. Since these values vary from system to system and user to user, their values can not be pre-fixed. One user may want his logs to be generated in “myLogs” folder, another user may want the logs to be generated in “appLogs” folder. If given in code, they cannot be changed without developer intervention. Further, this change would require a re-build of code.Read More →

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hashcode() and equals() : Overview hashcode() and equals() methods are defined in java.lang.Object class which is the super class of all classes in java and hence may be overridden in any class. The signature of hashcode() method is public int hashCode() which means it should return an integer, and The signature of equals() method looks like public boolean equals(Object obj) which means it returns a boolean value indicating whether the object which called it is equal to the object which is passed as an argument to it or not.Read More →

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It may happen that you need to add some days to a particular date and the resultant date is falling on either Saturday or Sunday. So you have to calculate the next working date. Practical Application : This is usually required in payments industry where the dates are written to files and these files are then uploaded to server but the server rejects the file if the date is a holiday. In such cases the date should be checked to be a holiday before writing it to file and incremented to a working day and then written to the file so that it is notRead More →

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Scenario Suppose we want to show a list of registered users of the application in a tabular format on a jsp. The list of users is created on the server and is bound to an attribute (in request, session or application scope) if you are using servlet or bound to an attribute in ModelAndView if you are using Spring controller as below.Read More →

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A web application developed using Java EE would definitely be using JSPs and would indeed involve transferring values from one JSP to another. For Example, a user is presented with a form where he fills the required details and presses a Next button where all those details are pre-filled in a non-editable form for him to confirm. The user checks the details to be correct and submits the form for further processing. The above scenario is pretty common and involves taking data from one JSP to another. This post addresses the approaches to achieve that.Read More →

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Comparison between two dates is a task that every developer has to perform. Comparison implies determining which date is earlier or later of the two dates. It would be great if we are aware of different ways in which we can achieve it. Below are some of the ways for comparing two dates using java api classes and their methods.Read More →

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Overall notion of Singleton class lies in getting one and only one instance of the class. Much of our functionality relies on the base that there will be only one object of a class we intentionally designed to be Singleton. What if the same class produces more than one object in some scenario? Woaaah!!! Our code blows away.Read More →