import java.io.File;

public class FileRename {
    public static void main(String[] args) {
        File oldName = new File("copyfile");
        File newName = new File("cpyFile2");
        if (oldName.renameTo(newName)){
            System.out.println("文件已重命名！");
        }else {
            System.out.println("Error!!!!!");
        }
    }
}