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Create a file and change its attribute to read-only in Java
The attribute of a file can be changed to read-only by using the method java.io.File.setReadOnly(). This method requires no parameters and it returns true if the file is set to read-only and false otherwise.
A program that demonstrates this is given as follows −
Example
import java.io.File;
public class Demo {
public static void main(String[] args) {
boolean flag;
try {
File file = new File("demo1.txt");
file.createNewFile();
flag = file.setReadOnly();
System.out.println("File is read-only?: " + flag);
flag = file.canWrite();
System.out.print("File is writable?: " + flag);
} catch(Exception e) {
e.printStackTrace();
}
}
}The output of the above program is as follows −
Output
File is read-only?: true File is writable?: false
Note − The output may vary on Online Compilers.
Now let us understand the above program.
The file can be set to read-only by using the method java.io.File.setReadOnly() and its return value is printed. A code snippet that demonstrates this is given as follows −
File file = new File("demo1.txt");
file.createNewFile();
flag = file.setReadOnly();
System.out.println("File is read-only?: " + flag);The method java.io.File.canWrite() is used to is confirm that the file is read-only and to do that, its return value is printed. A code snippet that demonstrates this is given as follows −
flag = file.canWrite();
System.out.print("File is writable?: " + flag);
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