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Incorrect string alignment

I use Java to determine the length of a double as part of a larger program. At this time, double is 666, but the length is returned as 5, which is a big problem. I read another question posted here with a solution, but this did not work for me. I will show my code and try to imitate the previous solution with the results.

My source code:

double Real = 666;
int lengthTest = String.valueOf(Real).trim().length();
System.out.println("Test: " + lengthTest);

Prints 5

Modifications that didn't work, and essentially just split the code into multiple lines.

    double Real = 666;
    String part = Real + "";
    part = part.trim();
    int newLength = part.length();
    System.out.println("new length : " + newLength);

It also prints 5.

Obviously, I want this to print how many numbers I have, in which case it should show 3.

, , , . ..: xx.yyezz, xx 5 , yy 5 , zz 2 . .

+4
2

, .

String.valueOf(Real); // returns 666.0, i.e. length 5

:

Integer simple = (int) Real;
String.valueOf(simple); // returns 666, i.e. length 3.
+8

. , 666.0. , String.valueOf(Real). int int:

double Real = 666;
int realInt = (int) Real;
System.out.println(String.valueOf(realInt).length());
0

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