2 weapon fighting

just saw this sage advice 

Class Features

General

When you use Extra Attack, do you have to use the same weapon for all the attacks?

Extra Attack imposes no limitation on what you use for the attacks. You can use regular weapons, improvised weapons, Unarmed Strike, or a combination of these options for the attacks. However, you must still follow the rules for equipping and unequipping weapons as part of the Attack action.

Am i correct to interpret it like i can hold a one handed weapon in one , hand and another in the other etc longsword , battleaxe and just attack once with the axe , once with the longsword , no dual wielding just using my extra attac and because i want to use different masteries

Yes.

You just have to follow for equipping and unequipping, so this means you can have a javelin in hand, throw it and pull out a spear to perform another attack. Since the rules for thrown weapons permits that.