In this post, we will see how to make a read only file in java. It is very simple. You need to just call java.io.File ‘s setReadOnly() method.
Java program:
1) How to make a file read only
Java program:
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package org.arpit.java2blog; import java.io.File; public class FileHiddenMain { public static void main(String[] args) { System.out.println("-----------------"); // Read the file File configFile=new File("/Users/Arpit/Desktop/config.properties"); configFile.setReadOnly(); if(configFile.canWrite()) { System.out.println("Config file can be writtern"); } else { System.out.println("config file is read only"); } System.out.println("-----------------"); } } |
When you run above program, you will get following output:
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----------------- config file is read only ----------------- |
2) How to make it writable again
If you have made file read only, you can make file writable again by using method setWritable(true).
This method is introduced in java 1.6.
Java program:
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package org.arpit.java2blog; import java.io.File; public class FileHiddenMain { public static void main(String[] args) { System.out.println("-----------------"); // Read the file File configFile=new File("/Users/Arpit/Desktop/config.properties"); configFile.setReadOnly(); if(configFile.canWrite()) { System.out.println("Config file can be written"); } else { System.out.println("config file is read only"); } System.out.println("-----------------"); System.out.println("Making config file writable again"); // this method is available from jdk 1.6 configFile.setWritable(true); if(configFile.canWrite()) { System.out.println("Config file can be written"); } else { System.out.println("config file is read only"); } System.out.println("-----------------"); } } |
When you run above program, you will get following output:
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----------------- config file is read only ----------------- Making config file writable again Config file can be written ----------------- |
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