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Hey Greg! Now I understand the stack/queue and ArrayList too :)
And if you don't mind please guide me again at this thread. Thanks!...

I like the concept of 'adjustable' array, you said. I'll try to figure it out. And I'll study about ArrayList after it.
Yes, now I understand Stack, because I use it for my college project.
I'll...

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I deleted my code, for safety, hahaha

I deleted my code, for safety, hahaha