The renameTo() method is a part of File class. The renameTo() function is used to rename the abstract path name of a File to a given path name. The function returns true if the file is renamed else returns false
Function Signature:
public boolean renameTo(File destination)
Syntax:
file.renameTo(File destination)
Parameters: The function requires File object destination as parameter, the new abstract path name of the present file.
Return Value: The function returns boolean data type. The function returns true the file is renamed else returns false
Exception: This method throws following exceptions:
- Security Exception if the method does not allow write operation of the abstract pathnames.
- NullPointerException if the destination filename is null.
Below programs will illustrate the use of renameTo() function:
Example 1: Try to rename the file program.txt to program1.txt
// Java program to demonstrate// the use of File.renameTo() method import java.io.*; public class GFG { public static void main(String args[]) { // create an abstract pathname (File object) File f = new File("F:\\program.txt"); // create the destination file object File dest = new File("F:\\program1.txt"); // check if the file can be renamed // to the abstract path name if (f.renameTo(dest)) { // display that the file is renamed // to the abstract path name System.out.println("File is renamed"); } else { // display that the file cannot be renamed // to the abstract path name System.out.println("File cannot be renamed"); } }} |
Output:
File is renamed
Example 2: Try to rename “program1.txt” to “prog.txt”, “prog.txt” is a existing file in the f: drive .
// Java program to demonstrate// the use of File.renameTo() method import java.io.*; public class GFG { public static void main(String args[]) { // create an abstract pathname (File object) File f = new File("F:\\program1.txt"); // create the destination file object File dest = new File("F:\\prog.txt"); // check if the file can be renamed // to the abstract path name if (f.renameTo(dest)) { // display that the file is renamed // to the abstract path name System.out.println("File is renamed"); } else { // display that the file cannot be renamed // to the abstract path name System.out.println("File cannot be renamed"); } }} |
Output:
File cannot be renamed
The programs might not run in an online IDE. please use an offline IDE and set the path of the file
