new SimpleDateFormat('s'): The seconds : SimpleDateFormat « Development « Java Tutorial

1. Java Tutorial
2. Development
3. SimpleDateFormat

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;

public class Main {
  public static void main(String[] argv) throws Exception {

    Format formatter = new SimpleDateFormat("s"); 
    String s = formatter.format(new Date());
    System.out.println(s);
  }
}