Java – simpledateformat parse (string STR) will not throw an exception when STR = 2011 / 12 / 12aaa?

Here is an example:

public MyDate() throws ParseException {
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/d");
    sdf.setLenient(false);
    String t1 = "2011/12/12aaa";
    System.out.println(sdf.parse(t1));
}

2011 / 12 / 12 AAA is not a valid date string However, this function prints "00:00:00 PST, Monday, December 12, 2011" and will not throw parseexception

Anyone can tell me how to make simpledateformat treat "2011 / 12 / 12aaa" as an invalid date string and throw an exception?

Solution

The Javadoc in parsing (...) is described as follows:

It seems that you cannot make simpledateformat throw an exception, but you can do the following:

SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/d");
sdf.setLenient(false);
ParsePosition p = new ParsePosition( 0 );
String t1 = "2011/12/12aaa";    
System.out.println(sdf.parse(t1,p));

if(p.getIndex() < t1.length()) {
  throw new ParseException( t1,p.getIndex() );
}

Basically, you check whether the analysis consumes the entire string, if not you have invalid input