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Thanks for your suggestion norm... i figure it out by doing a bit searching on the error message on the net. it seems that though the first value (val & current.item) was not null, which in case made...

Hi Norm,

Thanks for the reply

i've check the value using system.out.println
the value for "val" is "aa",
the value for "current.item" is "X622"

it's clear that both of them are not null......

HI there, please help out with a bug i encountered during my binary tree assignment.

i searched the net for a binary tree code and thanks to CHINMAY LOKESH, i found one with a tree displays in it....