java Object Operators

co.f	Member. The f field or method of object or class co.
x instanceof co	true if the object x is an instance of class co, or is an instance of the class of co.
a[i]	Array element access.
s + t	String concatentation if one or both operands are Strings.
x == y	true if x and y refer to the same object, otherwise false (even if values of the objects are the same).
x != y	As above for inequality.
comparison	Compare object values with .equals() or .compareTo()
x = y	Assignment copies the reference, not the object.