compiled on a JDK 1.4, sb1.append(sb2) will not work on java 1.3 JRE :
it requires append(StringBuffer).
compiled on a JDK 1.3, it is equivalent to a toString() call as
append(Object) method is used by compiler. It will work on all JRE but
will be non-optimal on JDK 1.4
Only two versions of the jar may solve this issue, or some JDK
compatibility test :
<pseudo-code>
final static boolean jdk13 =
System.getProperty("|java.vm.version"|).startWith("1.3");
if (jdk13) {
stb1.append(stb2.toString());
} else {
stb1.append(stb2);
}
</pseudo-code>
AFAIK, this code, compiled using JDK 1.4 will run under Java 1.3 without
noSuchMethodException AND uses Java1.4 Stringbuffer optimizations
sebb a écrit :
On 22/05/06, Nicolas De Loof <[EMAIL PROTECTED]> wrote:
>> It is supported in jdk1.3.. Just cast the stringbuffer passed in to
>> an object, so like
>> StringBuffer.append((Object) StringBuffer)). Much more efficient than
>> an if...
>>
>
> Surely a StringBuffer is already an Object?
>
> Or am I missing something here?
>
StringBuffer has a new method in Java 1.4 to append another Stringbuffer
without invoking it's toSring() method.
Code that uses StringBuffer.append(stb) and compiled by a JDK 1.4 will
not work on Java 1.3.
I miself recommand Using "StringBuffer.append(stb.toString())" that
looks better than an apparently useless (Object) cast : checkstyle or
IDE may warn for unecessary cast.
But that won't work so well on Java 1.4+.
Can't one just use:
sb1.append(sb2);
for both 1.3 and 1.4, and let the method do the work as needed?
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