oop - Creating an object differences java -

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i'm sure question have been answered not sure term search.

i unsure of difference between :

  jpanel = new jpanel();   = new jpanel();

with second line need declared variable @ top of class?

can please attach link can find out topic. know basic.

there 3 cases : declaration, initialization, , (declaration, , initialization) :

this declaration of object:

jpanel a;

this initialization of object :

a = new jpanel();

and can make both of them in 1 step :

jpanel = new jpanel();

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