Core java

In this post, we will see how to get last modified date of file in java. We can use java.io.File’s lastModified() method to get last modified date. This function returns time in milliseconds(long). We can convert this to required date format using SimpleDateFormat. Java Program: [crayon-6a2a99911b5cb982049097/] When you run above program, you will get below output: […]

In this post, we will see how to read object from file in java. In last post, we have already seen how to write object to a file and created employee.ser , now in this post, we are going to read same file and retrieve back Employee object. Java Serialization Tutorial: Serialization in javaJava Serialization […]

In this post, we will see how to list all files with certain extension in a folder. For example, you want to list all .jpg or .zip files in a folder. We will  use FilenameFilter interface to list the files in a folder, so we will create a inner class which will implement FilenameFilter interface and implement […]

In this post, we will see how to delete Directory/Folder which is non empty. You can use java.io.File ‘s delete empy folder but you can not delete it if it is non empty. There are multiple ways to do it. Using java recursion Using Apache common IO Using java recursion: It is very straight forward to […]

In this post, we will see how to download file from URL in java. It can be used when you want to automatically download any file from URL using java. There are many ways to do it and some of them are : Using Java input output stream Using apache common IO Using NIO Java […]

It is very easy to check if file exists or not in your file system. You can use java.io.File’s exists() method to check if file exists or not. Java program : [crayon-6a2a999131293902874247/] When you run above program, you will get following output: [crayon-6a2a99913129e857656045/]

In this post, we will see how to get size of file in java. We can directly use java.io.File ‘s length method to get its size in bytes. We can convert it to KB and MB accordingly. [crayon-6a2a99913151b236098879/] When you run above program, you will get following output: [crayon-6a2a999131523199520845/]

In this post, we will see how to get extension of file in java. As java.io.File does not provide any direct method for getting extension of file. This is used when you want to process file differently on the basis of its extension. I have worked on a project where I required this utility method. […]

In this post, we will see how to convert String to Date object in java. It is used when we have formatted String and need to convert it to Date object.You may also check how to convert Date to String Java program: [crayon-6a2a999132186868987650/] When you run above program, you will get following output: [crayon-6a2a99913218c394713281/]