[#GROOVY-2342] The compareTo method is not commutative for String and GString when used from Java - jira.codehaus.org

groovy

GROOVY-2756

The compareTo method is not commutative for String and GString when used from Java

Created: 29/Nov/07 02:31 AM Updated: 16/Oct/08 01:14 PM

Component/s:

None

Affects Version/s:

1.1-rc-3

Fix Version/s:

None

Time Tracking:

Not Specified

Description

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Try this Java Code with Java 1.4:

GString gstring = (GString) new GroovyShell().evaluate("\"${2*2}1\"");
String string = "41";
System.out.println(gstring.compareTo(string)); // 0
System.out.println(string.compareTo(gstring)); // ClassCastException

With Java 1.5 you get a compile error for string.compareTo(gstring), as Comparable uses Generics in Java 5. But still the commutativity is destroyed and it gives you no runtime safety, as we all no.

This is part of the gstring – string equality discussion.

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