Re: the new for loop for Collections does not perform the same as
the Iterator for Tomcat-sessions
GArlington schrieb:
On 5 Sep, 09:19, phi <p...@gressly.ch> wrote:
Hello
We tried the following code using JDK1.6 and tomcat 5.5 (and tomcat 6.0
as well) to enter a "note"-Object into a session.
The list-Variable is an ArrayList and therefore a Java Collection.
The new for-Loop does NOT do the job: the object "note" is always null
in the sesson.
for(Note note : list){
if(note.getNoteId() == noteId.intValue()){
session.setAttribute("note ", note);
break;
}
}
We converted to the old java style loop (using the iterator) and see:
it works!
Iterator iter = list.iterator();
while(iter.hasNext()){
Note n = (Note) iter.next();
if(n.getNoteId() == noteId.intValue()){
session.setAttribute("note", n);
break;
}
}
Any idea what is the differnce between the for(T t: c)-loop and the
Iterator-methods?
Is there for(T t: c) loop? Where did you find this syntax and what
does it do? I am familiar with for(init; cond; incr;) loop...
The for(<Type> <varibale> : <Collection>) - Loop is a new Construct
since JDK 1.5.
As I have mentioned, we are using JDK 1.6 (in Tomcat 6).
The for(<Type> <variable> : <Collection>) - Loop
see http://java.sun.com/j2se/1.5.0/docs/guide/language/foreach.html
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