Java allows you to rename a file by using the renameTo(File file) method, in the java.io.File class.

First, obtain a reference to the file that you want to rename. Second, invoke the renameTo() method on that reference using a File argument.

Suppose you have a file named Results.dat and you want to rename it Results_May.dat.

The code lines below show how it’s done:

//Obtain the reference of the existing fileFile oldFile = new File("Results.dat"); //Now invoke the renameTo() method on the reference, oldFile in this caseoldFile.renameTo(new File("Results_May.dat"));