An array is created by an array creation expression (§15.9) or an array initializer (§10.6).
An array creation expression specifies the element type, the number of levels of nested arrays, and the length of the array for at least one of the levels of nesting. The array's length is available as a final instance variable length.
An array initializer creates an array and provides initial values for all its components. (Contrast this with C and C++, where it is possible for an array initializer to specify initial values for some but not all of the components of an array.)