Primitive Types Classes & Objects int float double boolean String Object ArrayListUser-Defined Classes, e.g.,
Clock
,Fish
,Greeter
Construction int i = 3; int k = 42; Fish fish1 = new Fish(); Fish fish2 = new Fish();Operations + - * / %
(int only)i = i * 5; k = i + 2;
Methods defined in each classfish1.moveForward(); fish2.swimUp();