The method java.io.File.getUsableSpace() is used to obtain the usable space in the form of bytes for the virtual machine on the partition specified by the required abstract path name. This method requires no parameters and it returns the bytes for the virtual machine on the partition.A program that demonstrates this is given as follows −Example Live Demoimport java.io.File; public class Demo {    public static void main(String[] args) {       File[] roots = File.listRoots();       try {          for(File r : roots) {             System.out.println(r);         ... Read More

The method java.io.File.getFreeSpace() is used to obtain the free space in the form of unallocated bytes for the partition specified by the required abstract path name. This method requires no parameters and it returns the unallocated bytes for the partition.A program that demonstrates this is given as follows −Example Live Demoimport java.io.File; public class Demo {    public static void main(String[] args) {       File[] roots = File.listRoots();       try {          for(File r : roots) {          System.out.println(r);          System.out.println("Free space = " + r.getFreeSpace());     ... Read More

The method java.io.File.listRoots() is used to list the file system roots in Java. This method requires no parameters. It returns the available file system roots in the form of an array of file objects and if the file system roots cannot be determined, it returns null.A program that demonstrates this is given as follows −Example Live Demoimport java.io.File; public class Demo {    public static void main(String[] args) {       File[] roots = File.listRoots();       try {          for(File r : roots) {             System.out.println(r);         ... Read More

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 Live Demoimport 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);       ... Read More

In this article, we will learn to use Java to make a file read-only and check if it can still be written. A file can be set to read-only by using the method java.io.File.setReadOnly(). This method requires no parameters and returns true if the file is set to read-only and false otherwise. The method java.io.File.canWrite() is used to check whether the file can be written in Java and if not, then the file is confirmed to be read-only. Problem StatementThe task is to write a Java program that makes the file read-only and then checks whether the file can still ... Read More

A file or directory with the required abstract pathname can be deleted when the program ends i.e. after the virtual machine terminates using the method java.io.File.deleteOnExit(). This method requires no parameters and it does not return a value.A program that demonstrates this is given as follows −Example Live Demoimport java.io.File; public class Demo {    public static void main(String[] args) {       try {          File file = new File("demo1.txt");          file.createNewFile();          System.out.println("File: " + file);          file.deleteOnExit();       } catch(Exception e) {   ... Read More

The java.io.File class has display constants File.separatorChar and File.pathSeparatorChar mainly. The File.separatorChar is ‘/’ and the File.pathSeparatorChar is ‘:’ for Unix.A program that demonstrates this is given as follows −Example Live Demoimport java.io.File; public class Demo {    public static void main(String[] args) {       try {          System.out.println("File.pathSeparatorChar = " + File.pathSeparatorChar);          System.out.println("File.separatorChar = " + File.separatorChar);       } catch(Exception e) {          e.printStackTrace();       }    } }The output of the above program is as follows −OutputFile.pathSeparatorChar = : File.separatorChar = /Now let ... Read More

A new empty file with the required abstract path name can be created using the method java.io.File.createNewFile(). This method requires no parameters and it returns true if the file is newly created and it did not exist previously. If the file existed previously, it returns false.A program that demonstrates this is given as follows −Example Live Demoimport java.io.File; public class Demo {    public static void main(String[] args) {       try {          File file = new File("demo1.txt");          file.createNewFile();          System.out.println("File: " + file);       } catch(Exception ... Read More

A directory can be created with the required abstract path name using the method java.io.File.mkdir(). This method requires no parameters and it returns true on the success of the directory creation or false otherwise.A program that demonstrates this is given as follows −Example Live Demoimport java.io.File; public class Demo {    public static void main(String[] args) {       try {          File file = new File("c:\demo1\");          file.createNewFile();          boolean flag = file.mkdir();          System.out.print("Directory created? " + flag);       } catch(Exception e) {   ... Read More

The method File.renameTo() method of the java.io package is used to rename a file or directory. This method requires a single parameter i.e. the name that the file or directory is renamed to and it returns true on the success of the renaming or false otherwise. Syntax public boolean renameTo(File dest) Steps to rename a file or directory using File renameTo() method Below are the steps to rename a file or directory using the File renameTo() method − Import File class from java.io package Define the demo class with the main method. ... Read More