How do I rename a file using Java

Question

Can we rename a file say test.txt to testa.txt ?

If testa.txt exists will it rename ?

How do I rename it to the already existing testa.txt file so the new contents of test.txt are added to it for later use?

Answer 1

Try This

File file=new File("Your File");
boolean renameResult = file.renameTo(new File("New Name"));

Answer 2

// File (or directory) with old name
File file = new File("oldname");

// File (or directory) with new name
File file2 = new File("newname");

if (file2.exists())
   throw new java.io.IOException("file exists");

// Rename file (or directory)
boolean success = file.renameTo(file2);

if (!success) {
   // File was not successfully renamed
}

To append to the new file:

java.io.FileWriter out= new java.io.FileWriter(file2, true /*append=yes*/);