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Simple Date Formatter

Rimjhim Ray

Joined: Jan 11, 2005
Posts: 9
The following piece of code

newValue = formatter.parse(new String("").trim(), new Pa

returns null in java 1.4 but returns unix epoch time in java 1.3. Can any of you confirm if there has been such a major change in implementation of SDF from 1.3 to 1.4? If it has where can I find the documentation?

Ernest Friedman-Hill
author and iconoclast

Joined: Jul 08, 2003
Posts: 24199

First, note that

new String("").trim()

is the same as

new String("")

which is the same as


Second: I don't see anywhere in the Javadocs where it says that "" will be handled specially; it's not a valid date, so I'd expect null to be returned, regardless of JDK version. I think this code was relying on undefined behavior.

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Steve Morrow
Ranch Hand

Joined: May 22, 2003
Posts: 657

There seems to be a resurgence of "new String("blah")"...

From the API:

public String(String original)

Initializes a newly created String object so that it represents the same sequence of characters as the argument; in other words, the newly created string is a copy of the argument string. Unless an explicit copy of original is needed, use of this constructor is unnecessary since Strings are immutable.
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subject: Simple Date Formatter
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