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Collection - Core Java Interview Question

January 25, 2013

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Cursors in Java's Collection framework

Java Cursor A Java Cursor is an Iterator, which is used to iterate or traverse or retrieve a Collection or Stream object’s elements one by one. There are four type of cursors provided by Java: Enumeration Iterator ListIterator Spliterator(Java 1.8) Note : Java Enumeration interface is deprecated, it is not recommended to use this in our applications. Enumeration This interface has introduced in 1.0 version it contains the following 2 methods. public boolean hasMoreElements() public Object nextElement() Limitations of Enumeration It is applicable only for legacy classes and it is not a universal cursor. While iterating the objects by using enumeration we can get only read access and we can’t perform removal or replacement operations. It supports only Forward Direction iteration. That’s why it is also know as Uni-Directional Cursor. To overcome these problems we should go for Iterator interface. Iterator It is Introduced in 1.2 version in ja

Low Level Design Document (LLD)

Low Level Design Document (LLD) : 'via Blog this'

Read / Write/Update Excel file in Java using Apache POI HssfWorkBook

Read / Write/Update Excel file in Java using Apache POI I found a nice article to use Apache POI ,which I wanted to share here .Hope in your development you can take help from this article. Apache POI is a powerful Java library to work with different Microsoft Office file formats such as Excel, Power point, Visio, MS Word etc. The name POI was originally an acronym for Poor Obfuscation Implementation , referring humorously to the fact that the file formats seemed to be deliberately obfuscated, but poorly, since they were successfully reverse-engineered. In this tutorial we will use Apache POI library to perform different functions on Microsoft Excel spreadsheet. Let’s get started. Tools & Technologies: Java JDK 1.5 or above Apache POI library v3.8 or above ( download ) Eclipse 3.2 above (optional) Read Excel File To read an excel file, Apache POI provides certain easy-to-use APIs. In below sample code we use different classes from POI library to read c

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Collection - Core Java Interview Question

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