Java Data Type - 如何将mm/dd/yyyy转换为yyyy-mm-dd

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

public class Main {

  private static SimpleDateFormat inSDF = new SimpleDateFormat("mm/dd/yyyy");
  private static SimpleDateFormat outSDF = new SimpleDateFormat("yyyy-mm-dd");

  public static String formatDate(String inDate) {
    String outDate = "";
    if (inDate != null) {
        try {
            Date date = inSDF.parse(inDate);
            outDate = outSDF.format(date);
        } catch (ParseException ex){ 
        }
    }
    return outDate;
  }

  public static void main(String[] args) {
    System.out.println(Main.formatDate("12/10/2013"));
  }

}