import java.io.FileWriter;
import java.io.IOException;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

public class TimeWriter {
    public static void main(String[] args) {
        LocalDateTime currentTime = LocalDateTime.now();
        String formattedTime = currentTime.format(DateTimeFormatter.ISO_LOCAL_DATE_TIME);

        try (FileWriter writer = new FileWriter("time.txt")) {
            writer.write(formattedTime);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

In this example, we first obtain the current time using LocalDateTime.now() and convert it to a string using format() method of DateTimeFormatter with the ISO_LOCAL_DATE_TIME pattern.

Next, we use FileWriter to create a writer object and pass the file name "time.txt" as the parameter.

Inside the try block, we call the write() method of the writer object and pass the formatted time string as the parameter to write it to the file.

Finally, we add an exception handling block to catch any IOException that may occur during the file writing process.

Remember to handle any exceptions that may occur during file operations to ensure proper error handling.