As long as no one is in the park you should not have a problem, but you can not throw around people.
It probably depends on the park, but in most cases I would say no because you are throwing a large spear that could kill somebody if it hit them.
only if you throw them at hobos and gay couples
Umm, probably not.
no
I was Just wondering if your aloud to throw a javelin in a park on the big field bits are you?