Rename file or directory

   

import java.io.File;

public class Main {
  public static void main(String[] args) {
    File oldName = new File("C:/s.txt");
    File newName = new File("C:/d.txt");

    if (oldName.renameTo(newName)) {
      System.out.println("renamed");
    } else {
      System.out.println("Error");
    }
  }
}

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Rename file or directory : Files « File Input Output « Java

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