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Note the strange output for arrays.  In the case of an array, the toString() method (and the getName() method) for Class returns a name like:

[Ljava.lang.Double;

Where the [ means "array of" and the remaining character(s) are chosen from the following table (see the Java Language Specification), with the specified meaning.

For example, the following piece of code:

(new int[3][4][5][6][7][8][9]).getClass().getName()

returns:

[[[[[[[I

This strange encoding is used in a number of places in Java, notably in Reflection and also in JNI (Java Native Interface) when interfacing with code written in other languages (notably C and C++).