How To Compress Image Using Java

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Compression of image file is one of the important task when it comes to save the large number of image files. It saves lot of space if you could compress the images when it is necessary. This example demonstrates how to compress the the JPEG file and reduce the size. ImageWriteParam class is mainly used […]

How To Get Image Format Using Java

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Java provides the ImageIO to work with image files. This example demonstrates how to get the type or format of the image file. It is necessary to know the type of the file when you are processing the images. Java has ImageReader which stores the type of image file. One image can have more that […]

How To Create Zip File Using Java

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This example demonstrates how to create a zip file with the files and directories. Java provides java.util.zip package for compressing and packaging to zip file format. It is very common utility used by most of the applications. The key classes used in this package for packaging to zip format are ZipOutputStream, ZipEntry and Deflater. This […]

How To List Contents Of Zip File using Java

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This example shows how to list the files inside a zip file. Zip is the most widely used utility for compressing the files and it is the Windows platform standard. In cases where you would need to work on the Zip file in Java for reading and writing into zip file. Here I write a […]

java.io.NotSerializableException

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java.io.NotSerializableException is thrown when the object is not eligible for the serialization. You must implement the Serializable interface to make the class eligible for the serialization. This is a marker interface which tells the JVM that the class can be serialized. Look at the below example. Employee.java Employee class which not implementing the serializable interface. NotSerializableExceptionExample.java […]

java.io.UnsupportedEncodingException

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In my previous example I have explained how to check if your JVM support the charset used by your application. Java IO package defines java.io.UnsupportedEncodingException as a checked exception for catching it if programmers want to use the charset operation. If the JVM not supports the charset, then you will get the java.io.UnsupportedEncodingException thrown from your application. […]

How To Get Supported CharSet From JVM

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If you want to view the web page or anything in your system, there must be chartset to support the one used in the web page or files. Most of the web pages would work because the most common charset is English which is by default supported by all the platforms. If you are viewing […]

Append To File using FileOutputStream

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In my previous example I have explained about how to write to a file using the FileOutputStream. This example demonstrates how to append to an existing file without creating the new file. By default, FileOutputStream creates new file or overwrite when we try to write into a file. If you want to append with the […]

Java PrintStream Example

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In my previous example I have explained about the PrintWriter for printing the formatted output to the console and file. This example demonstrates how to use the PrintStream. Note that PrintWriter and PrintStream defines the similar methods and work very much similar, except that PrintWriter writes the sequence of characters and PrintStream writes the stream of […]

Java PrintWriter Example

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Java provides PrintWriter for printing the well formatted output to the desired location.  This class takes the OutputStream or Writer as the input and prints the output with the human readable format. PrintWriter defines the following constructors: PrintWriter(File file) – Creates a new PrintWriter, without automatic line flushing, with the specified file. PrintWriter(File file, String […]