How to write (log2(log2n)) in java

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am trying to find the average number of comparisons in linear, binary, and Interpolation search and I found that by using this (log2(log2N)) we can find the average number of comparisons in interpolation

but I could not represent this (log2(log2N)) as a java code and am not sure if it is right

What I have tried:

double average_seq = (n +1 ) /2;
         double  average_bin = Math.log(n) / Math.log(2);
         double average_inte = Math.log(2)/Math.log(Math.log(n)) ;