In Java, what is meant by this "double cannot be dereferenced" error? -

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this question has answer here:

i have following code :

public class randomcompliment {    static final string[] comps  = { "gorgeous butterfly!", "strawberry milkshake!", "calm waterfall", "smart cookie", "big genius", "friendly cat" };    public static void main(string[] args) {      (int = 0; < 200 ; i++ ) {       system.out.print("good monring, " + comps[(((20) * math.sin(i)).intvalue()) % comps.length]);     }   } }

and giving me error :

c:\misc_stuff\randomscratch>javac randomcompliment.java randomcompliment.java:14: double cannot dereferenced system.out.print(" " + comps[ ( ((20) * math. sin(i)).intvalue() ) % comps.length ]);

   ^ 1 error

what meant "dereferenced" here ?

math.sin(i) returns double. cannot invoke method (intvalue()) on double (or primitive data-type). instead, can down-cast double int:

(int) (20 * math.sin(i))

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