In my previous example I have explained how to use static initializer in Java.This example shows how to use the instance initializer block in Java. The following are the few features of instance blocks. Instance initializers are block of code with out any keyword keyword. The code which needs to be initialized will be put …
Java Basics
Static Initializer In Java
This example shows how to use the static initializer in Java. The following are the few features of static blocks. Static initializers are block of code with static keyword. These are executed when the class is loaded or accessed first time by any application. Only static variables can be initialized inside static blocks. Instance variables …
How To Get OS In Java
This post writes a simple Java example program to get the current operating system. There is a system property in Java, System.getProperty(“os.name”) which returns the operating system. However, this utility returns the operating system type like Windows, Mac, Unix or Linux. Lets look at the below example. GetOSExample.java Output…
File Modified Date Manipulation in Java
This example demonstrates the basic data manipulation operation in a File object. Java File object has set of methods to perform the following operations: Get the file last modified date Change the file modified date Lets look at the example to see how the above operations are implemented in Java example program. We use SImpleDateFormat …
How To Set The File Permissions In Java
Setting the file permissions in Java is OS specific. Each type of file system have different kind of file systems. Java provides the very generic solution to set the file permissions for all kind of file systems. This example demonstrates how to set file permissions to a file in the Linux operating system using Java …
Marker Interfaces in Java
Marker Interfaces in Java are special interfaces which don’t declare any methods inside the interface definition. Because of that, if a class implements the marker interface don’t need to override any methods. What is the use of marker interface in Java?. It implicitly imposes a functionality or characteristic to the implementing class. There are many …
Read An Object From File In Java (Deserialization)
In my previous tutorial I have explained about writing an object to a file using the serialization concept. Once you have written to a file, that file will be transferred across the network and would reach the destination. Once it is received, the receiver has to decode that file abd reading and converting back to …
Write An Object To File In Java (Serialization)
Java objects can be written to a file. If you implement Serializable interface to a class, implicitly that class is eligible for the serialization. Serializable is a marker interface which doesn’t have any methods defined. Serialization is the concept where an object can be converted to byte streams and transferred to the network. It is very much useful …