How to convert a string into orcle date format

i need some information about converting string into date format.i have string like '20-SEP-05' .so we have to convert into date formate like yy-mm-dd' (2005-09-20).how can we do it.

Here's some code to help. I can't remember what method uses what format though
  public static java.sql.Date sqlDateValueOf( String dateString ) {
    String stringDate = null;
    if ( dateString == null || dateString.length() < 10 ) return null;
    String strDay = "";
    String strMonth = "";
    String strYear = "";
    if ( dateString.substring(4,5).equals( "-" ) ) {
      strDay = dateString.substring(8, 10);
      if ( strDay.length() < 2 ) strDay = "0" + strDay;
      strMonth = dateString.substring(5, 7);
      strMonth = dateString.valueOf(Integer.parseInt(strMonth) - 1);
      if ( strMonth.length() < 2 ) strMonth = "0" + strMonth;
      strYear = dateString.substring(0, 4);
      stringDate = strDay + "-" + strMonth + "-" + strYear;
    else if ( dateString.substring(2,3).equals( "-" ) ) {
      strDay = dateString.substring(0, 2);
      if ( strDay.length() < 2 ) strDay = "0" + strDay;
      strMonth = dateString.substring(3, 5);
      strMonth = String.valueOf(Integer.parseInt(strMonth) - 1);
      if ( strMonth.length() < 2 ) strMonth = "0" + strMonth;
      strYear = dateString.substring(6, 10);
      stringDate = strDay + "-" + strMonth + "-" + strYear;
    Calendar cal = Calendar.getInstance();
    cal.set( Calendar.YEAR, Integer.parseInt( strYear ) );
    cal.set( Calendar.MONTH, Integer.parseInt( strMonth ) );
    cal.set( Calendar.DAY_OF_MONTH, Integer.parseInt( strDay ) );
    java.sql.Date outDate = new java.sql.Date( cal.getTimeInMillis() );
    return outDate;
  public static String toDateString( java.util.Date date) {
    if ( date == null || date.toString().length() < 10 ) return null;
    String outDate = "";
    SimpleDateFormat df = new SimpleDateFormat("dd-MM-yyyy");
    outDate = df.format( date );
    return outDate;
  public static String toDateString( java.sql.Date date) {
    if ( date == null || date.toString().length() < 10 ) return null;
    String outDate = "";
    SimpleDateFormat df = new SimpleDateFormat("dd-MM-yyyy");
    outDate = df.format( date );
    return outDate;
  public static String toDateString( java.sql.Date date, String format) {
    if ( date == null || date.toString().length() < 10 ) return null;
    String outDate = "";
    SimpleDateFormat df = new SimpleDateFormat( format );
    outDate = df.format( date );
    return outDate;
  public static String toDateString( java.sql.Timestamp date) {
    if ( date == null || date.toString().length() < 10 ) return null;
    String outDate = "";
    SimpleDateFormat df = new SimpleDateFormat("dd-MM-yyyy");
    outDate = df.format( date );
    return outDate;
  }

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