removing from map

[oll3i]

can i remove an element from map using

if("Roza Czerwona".equal s(nazwa_kwiata) ){
zawartosc.remov e(new RozaCzerwona()) ;
}
it seems that it doesnt work

[r035198x]

can i remove an element from map using

if("Roza Czerwona".equal s(nazwa_kwiata) ){
zawartosc.remov e(new RozaCzerwona()) ;
}
it seems that it doesnt work

That wont work. You are creating a new RozaCzerwona and trying to remove it from zawartosc where it has not been put.

[JosAH]

That wont work. You are creating a new RozaCzerwona and trying to remove it from zawartosc where it has not been put.

That all depends whether or not the OP has implemented the equals()
and hashCode() methods correctly for that particular class. The code
fragment does smell funny though.

kind regards,

Jos

[oll3i]

i changed it to arraylist now i need to remove eg RozaCzerwona() from that list
should i define equals method for RozaCzerwona () and every other flower that may be in that list ?
how should i remove it?

[oll3i]

okey i solved it thank you very much