JQuery ID Selector Example

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JQuery Id selector selects elements with the given id attribute. It represents the tag with the given ID in the document object model. The id selector is a name preceded by a hash character (#). The id selector matches an element based on contents of the given id attribute which match exactly the value given […]

java.sql.SQLException: Can’t call commit when autocommit=true Exception

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When you work with JDBC application, by default the auto commit is set to true, after the transaction is completed all the transactions are committed to the database. When it is set as true, you can not explicitly call the commit method. If you call the connection.commit() method, then the below exception will be thrown.

State Design Pattern In Java

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This tutorial explains the state design pattern with a simple example program. State design pattern is very similar to the Strategy pattern, the only difference is that state design pattern maintains the state of the context where as strategy pattern passes the context and execute the specific strategy. The state design pattern is very useful […]

How To Split And Merge Files Using Java

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When transferring files through network or uploading to internet, it is common that file size could be the real factor. In those scenarios, splitting the file will solve your problem. The files will be splitted into small parts of chunks, that will be merged into a single file at the destination. This example shows how […]

Load Files From ClassPath Using getResourceStream()

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If you are looking to load a file from the classpath of your project, the use the method getResourceAsStream(). The main difference from the File class is that, File class uses the absolute path for finding the files. java.io are dependent on the current working directory of your application. There are not dependent on the […]

Downcasting In Java

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Upcasting is assigning the sub class reference object to the parent class which is allowed in Java. Downcasting is assigning parent class reference object to the sub class which is not allowed in Java. However, if you do downcasting, there will not be any compiler error. But, there will be runtime exception java.lang.ClassCastException. Then why […]

Static Nested Class In Java

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Static Nested classes are inner classes which are declared inside another class and also declared with static keyword. The main difference between inner class and static nested classes is that inner classes are non-static and static nested classes are static. Also known as static classes. Static nested classes can be accessed using the enclosing class […]

Java InputStreamReader Example

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InputStreamReader is bridge between bytes and streams. This usually reads the bytes from the source files and convert them to the characters with the specified charset. Which charset has to be used will be specified with the name. In this example I have used “UTF-8″ charset. This exampls shows how to use InputStreamReader for reading […]

How To Count Files In A Directory Using Java

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This example shows how to count the number of files in a folder. File class defines a method list() which returns the array of file names in the directory. By getting the length of that array would mean the number of files in the folder. Lets look at the simple example. CountFilesExample.java

How To Check Type Of Drive (Hard Disk / Removable Disk) In Java

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This example shows how to check if for a hard disk or removable disk in the system. FileSystemView.isFloppyDrive() returns if the disk is removable. If you look at this example, it prints some of the details about the drive like read, write, etc. DrivesExample.java Output…