Saturday, 27 February 2016

How to Copy Non Empty Directory with Files in Java 7 - Example Tutorial

It's easy to copy a file or empty directory in Java as you can use Files.copy(fromPath, toPath) from Java 7, but, unfortunately, it's not as easy to copy a non-empty directory with all its files and subdirectories in Java, much like deleting a non-empty directory. There is no method in Java IO API which copies everything inside one directory to another. The copy(source, target, CopyOption...) method can copy directories, but files inside the directories are not copied. So the new directory will be empty even if the original directory contains files and folders. Similarly, the copy fails if target directory already exists, unless the REPLACE_EXISTING copy option is specified. No doubt that NIO 2 of Java 7 has made life easier for Java programmers and provides useful tools to deal with files and directories, the onus is now on Java developers to learn and make the best use of it. If you to learn more about NIO 2 features, see here.
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Friday, 26 February 2016

How to connect to Microsoft SQL Server database using Eclipse

Though I prefer SQL Server Management Studio to access and work with Microsoft SQL Server database, Sometimes, it's better to connect MSSQL database directly from Eclipse. This will save a lot of time which is wasted on switching between two applications, Eclipse and SSMS. It will also keep your PC fast enough because less application means less overhead. Eclipse IDE allows you to connect to almost all the database you have heard e.g. Oracle, MySQL, PostgreSQL, DB2 etc. All the steps are pretty much same, so once you know how to connect SQL Server database from Eclipse, you can connect Oracle or MySQL by yourself. Since Eclipse connects to the database using JDBC, you need to deploy JDBC drivers in your classpath. This is done part of New Database Connection Profile, one of the steps, which we will see later. In this article, I'll show you step by step guide to connect to Microsoft SQL Server database using Eclipse.
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Thursday, 25 February 2016

Data Access Object (DAO) design pattern in Java - Tutorial Example

Data Access Object or DAO design pattern is a popular design pattern to implement persistence layer of Java application. DAO pattern is based on abstraction and encapsulation design principles and shields rest of application from any change in the persistence layer e.g. change of database from Oracle to MySQL, change of persistence technology e.g. from File System to Database. For example, if you are authenticating the user using a relational database and later your company wants to use LDAP to perform authentication. If you are using DAO design pattern to access database, it would be relatively safe as you only need to make a change on Data Access Layer. DAO design pattern also keeps coupling low between different parts of an application. By using DAO design pattern your View Layer is completely independent of DAO layer and only Service layer has the dependency on it which is also abstracted by using DAO interface.
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Monday, 22 February 2016

3 Examples to Get the Id of an Element in jQuery

As a page author, the id of an HTML element is something you should know, but there are scenarios when the page is automatically generated or may be some form elements are generated by using frameworks like JSF. In that case, what do you do if you want to find id attribute of some elements in the page programmatically? How do you find those ids using jQuery? There are several ways to solve this problem, a couple of them we'll see in this article itself.  The jQuery API provides many methods to get any attribute or property including the id of an HTML element programmatically. In this article, I am going to share three easy ways to get the id of an element using jQuery.
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Saturday, 20 February 2016

2 ways to Split String with Dot (.) in Java using Regular Expression

You can use the split() method of java.lang.String class to split a String based on the dot. Unlike comma, colon, or whitespace, a dot is not a common delimiter to join String, and that's why beginner often struggles to split a String by dot. One more reason for this struggle is the dot being a special character in the regular expression. If you want to split String on the dot you need to escape dot as \\. instead of just passing "." to  the split() method. Alternatively, you can also use the regular expression [.] to split the String by a dot in Java. The dot is mostly used to get the file extension as shown in our example. The logic and method are exactly same as earlier examples of split string on space and split the string on a comma, the only difference is the regular expression. Once you know how to write the regular expression, all these examples will be same for you. Java's regular expression is inspired by Perl.
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Friday, 19 February 2016

How to add Columns to an Existing table in SQL Server

Adding a new column to an existing table with data is always tricky. You need to know what data is there, how much data is there, to gauge how long your query is gonna take to complete in production. Also, you cannot add NOT NULL columns into an existing table if they are not empty and you don't have a default value specified. If you know SQL then you probably know that you can add columns to an existing table in SQL Server using ALTER command. It not only allows you to add a column but to drop columns as well. You can also add or drop constraints using ALTER command. Btw, you need to be careful while doing anything with existing tables because of data inside, which presents some challenges while adding new columns or dropping existing ones.
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Wednesday, 17 February 2016

How does Enhanced for loop works in Java?

It's a long time since JDK 1.5 introduced the enhanced for loop, almost 12 years ago in the year 2004, but still many Java developers don't know basics of enhanced for loop, also known as for each loop in Java. The enhanced for loop provides the cleanest way to loop through an array or collection in Java, as you don't need to keep track of counter or you don't need to call the hasNext() method to check whether there are more elements left. The key point, which many Java developer doesn't know about the enhanced for loop is that you can use any Object which implements the Iterable interface on for (: ) construct, you can even use enhanced for loop to loop through the array. Since JDK 8 also introduced a forEach() function to provide looping functionality, don't confuse when I say for each loop with that. In this article, we'll see how enhanced for loop works and couple of important points related to it.
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Sunday, 14 February 2016

Solving java.lang.ArrayindexOutOfBoundsException: 1 in Java

The error ArrayIndexOutOfBoundsException: 1 means index 1 is invalid and it's out of bound i.e. more than the length of the array. Since array has a zero-based index in Java, this means you are trying to access the second element of an array which only contains one element. The ArrayIndexOutfBoundsException comes when your code, mostly for loop tries to access an invalid index of the array. If you have worked in C, C++ then you will notice this difference between array in C and Java. You simply cannot access invalid array index in Java i.e. indexes which are less than zero and more than the length of the array. ArrayIndexOutOfBounds is also a subclass of IndexOutOfBoundsException which is used to throw error related to invalid index e.g. try to access outside of length in String etc.
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Saturday, 13 February 2016

How to Loop Through An Array in Java with Example

There are multiple ways to loop over an array in Java e.g. you can use a for loop, an enhanced for loop, a while loop or a do-while loop. Since while and do-while needs a condition to terminate they often depend upon the content of the array e.g. stop when the current element is null or even or odd etc. If you just want to iterate over an array to access each element e.g. loop over an array and print each entry then you should use either for loop or the enhanced for loop. The traditional for loop uses a counter and allows you to iterate until the last element is reached i.e. counter is equal to the length of the array while enhanced for loop maintains that counter internally, allowing you to iterate without worrying about counts. This results in clean code and it also eliminates the possibility of one-off errors. In this article, I'll show you 2 ways to iterate over an array, first by using traditional for loop and second by using enhanced for loop of Java 1.5.
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Wednesday, 10 February 2016

6 example to declare two dimensional array in Java

Declaring a two-dimensional array is interesting in Java as Java programming language provides many ways to declare a 2D array and each way have some special things to learn about. For example, It's possible to create a two-dimensional array in Java without specifying the second dimension, sounds crazy right? but it's possible because two-dimensional array in Java is nothing but an array of array. You can even create a two-dimensional array where each subarray has different length or different type, also known as a heterogeneous array in Java. Some of the ways described here also apply how you to declare one-dimensional array e.g. changing the place of square brackets and it has implication on any other variables declared in the same line.
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Tuesday, 9 February 2016

How to remove all special characters from String in Java

You can use regular expression and replaceAll() method of java.lang.String class to remove all special characters from String. A special character is nothing but characters like ! #, % etc. Precisely, you need to define what is a special character for you. Once you define that you can use a regular expression to replace those character with empty String, which is equivalent to removing all special characters from String. For example, suppose, your String contains some special characters e.g. "Awesome!!!" and you want to remove those !!! to reduce some excitement, you can use replaceAll("!", "") to get rid of all exclamation mark from String. Similarly, if you String contains many special characters, you can remove all of them by just picking alphanumeric characters e.g. replaceAll("[^a-zA-Z0-9_-]", ""), which will replace anything with empty String except a to z, A to Z, 0 to 9,_ and dash. Let's see couple fo examples to remove all special characters from String in Java.
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Introduction of How Android Works for Java Programmers

Android development is a current buzz in Java programming world. It's the Android, which keeps Java in the forefront of the last couple of years. Now, How important is to understand or learn Android for Java programmers? Well, it depends on, if you like application development and want to reach a mass, Android offers that opportunity to you. Millions of Android phones are available and they are keep increasing, with pace, much higher than iPhone or iOS. What all these means is, it does make a lot of sense to learn Android programming for Java programmer, and this article is about that, but this is also a one of the good reason to learn Java programming. This tutorial will give you a basic idea of How Android works? not detailed but a good overview.
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Monday, 8 February 2016

5 Good Books to Learn Unit testing, JUnit and TDD in Java

Unit testing is very, very important thing to learn adapt. I would say this is the single most practice in my book which differentiates a good programmer with a professional programmer. It's one way you can see how disciplined a programmer is? It's also the best way to write clean code; a code which can stand the test of time, a code which is flexible enough to accommodate future changes and a code which you don't afraid while changing. Despite several efforts of promoting unit testing by programming community and emphasizing unit testing by many notable programmers, it's still one of the lacking practice.
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Sunday, 7 February 2016

java.lang.ClassNotFoundException: com.sun.jersey.spi.container.servlet.ServletContainer [Solution]

The error message clearly says that Java runtime is not able to find a class called ServletContainer for Jersey library. This is the Servlet class you have specified in the deployment descriptor of your application. It's similar to DispatcherServlet of Spring MVC and this error is similar to the error you get when DisplayServlet was not in the classpath.
Anyway, java.lang.ClassNotFoundException: com.sun.jersey.spi.container.servlet.ServletContainer comes when you are trying to use Jersey but have not added required dependency on your classpath e.g. those JAR files which contain the class "com.sun.jersey.spi.container.servlet.ServletContainer".
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Saturday, 6 February 2016

Top 5 Java Performance Tuning Books - Best of Lot, Must read

Why should Java developer read a book on Performance tuning? When I first faced this question long time back, I thought I will do it later, but I never get back to that for a long time. I realize my mistake of having a lack of knowledge on performance measurement, tuning and finding bottleneck only when I faced serious performance and scalability issues on our mission critical server side financial application written in Java. It's true that when you really need it you learn most, but those times are not the best time to learn fundamentals, in fact, those times are to apply and correct your misunderstanding. This is why I am sharing these Java performance books to all Java programmers and suggesting them to take some time and go through at least one book in full. By the way, these books are in addition to my 5 must-read books for Java programmers.
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Which Programming Book Would You Buy if 100$ is Given to Spend?

Hello Guys, it's time to take a hypothetical question in Javarevisited. Which programming book, would you love to buy, if you are given 100$ to spend? I know, when it comes to buying, people want to the worth of their money, and that's why I am posting this question to you guys. Suppose you are looking some books in a bookstore and suddenly salesman comes and say, at this particular minute, we are giving you 100$ FREE to buy any programming book. Now you just have 10 minutes to complete your purchase and take away those awesome Java books absolutely for FREE, what are the books you are going to buy?
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Thursday, 4 February 2016

How to get first and last character of String in Java - Example

You can get the first and last character of a String using charAt() method in Java. This method accepts an integer index and returns the corresponding character from String. Since Java String is backed by an array, their index is also zero-based, which means the first character resides at index zero and the last character is at index, length-1, where length is the number of characters in the String. You can get the length of String by calling the length() method. The charAt() method is not defined on java.lang.String class, but on its super interface java.lang.CharSequence, hence it will also work for StringBuffer and StringBuilder. This method returns the char value at the specified index. An index ranges from 0 to length() - 1. The first char value of the sequence is at index 0, the next at index 1, and so on, as for array indexing. If the char value specified by the index is a surrogate, the surrogate value is returned.
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