How to make a file read-only in Java

In this blog post, I will be explaining how you can make a file read-only in Java. Consider the following code snippet:

package learnjava.io;import java.io.File;public class ReadOnlyDemo {public static void main(String[] args) {String fileName = "F:/Test1.txt";File file = new File(fileName);if(file.setReadOnly()){System.out.println("File is now readonly");}elseSystem.out.println("Failed to make the file readonly");}}

There is a method called File.setReadOnly. This makes a file as read only. It returns true if the file is made readonly successfully. If the file does not exist at that path, or if any other issue occurs, it returns false. So if you run the above code snippet, the file “F:/Test1.txt” will be made as readonly. If you try to edit and save it, you will see the following error:

Comments

Post a Comment

Popular posts from this blog

Java 11 String enhancements with examples

Java 11 has made some significant improvements to the String class. In this article, we will be exploring the Java 11 String enhancements strip Java 11 has added a new strip method to the String class. This method removes all the leading and trailing whitespaces in a String. Consider the following code: String input = " Hello World ";System.out.println(input);String output = input.strip();System.out.println(output); This code produces the following output: Hello WorldHello World In addition to strip , the String class also has a trim method which also removes all leading and trailing whitespaces. This method exists right from the early versions of Java and so has some limitations. Earlier, the ASCII character set was used. So, trim can only remove whitespaces represented by ASCII characters. However, later on Java adopted the Unicode character set.  Unicode has some additional characters that represent whitespace. The trim method cannot remove these whitespaces....
Read more

How to add Maven dependencies via Eclipse

Image
In this blog post, I will be giving step by step directions on how you can add Maven dependencies via Eclipse. What is Maven Maven as you might probably know is a dependency management tool. It automatically downloads the necessary jar files for you.So you do not need to download the jar files and add them to your classpath explicitly. Maven uses a file named as pom.xml. This file has all the project configuration. The external jar files that are needed for the project need to be added as dependencies in this pom file. So for example, if you need Hibernate JAR files in your project, you will need to add Hibernate dependencies in the pom file. Maven then automatically downloads the jar files and adds them to the classpath. So let’s get started. Adding Maven Dependencies Via Eclipse Step 1 – Create your Maven project via Eclipse (Refer this post)   Step 2 – Right click on pom.xml. Click on Maven –> Add Depenency Step 3 – Enter group id, artifact id a...
Read more

JPA/Hibernate Inheritance Mapping Strategies Explained

Image
Java is inherently an object-oriented language. Databases are relational in nature. JPA/Hibernate support Inheritance strategies . These allow mapping Java class hierarchies to database tables. In this article, I will be covering inheritance strategies supported by JPA/Hibernate. Introduction JPA/Hibernate support 4 inheritance strategies, Single Table , Joined , Table Per Sub-class and MappedSuperClass . In this article, I will be covering each inheritance strategy and how it works. Sample Code Consider the following class diagram: Inheritance_strategies_class_diagram   Here Person is a super class. It has two sub-classes, Employee and Customer . Let us see how each of these strategies work for the above class hierarchy. Single Table This strategy is also known as table per hierarchy . In this strategy, JPA creates a single table corresponding to all the classes in the inheritance hierarchy. This table has columns corresponding to the fields in all the classes in the hier...
Read more