code for Math.getExponent in java

public class FloastPointDemo {
public static void main (String[] args) {
// Returns the unbiased exponent value of a double,
// where 2^exp <= d. In this case, 2^4 <= 17
int exp = Math.getExponent (17.0);
System.out.println ("Math.getExponent (17.0) = " + exp);

}
}

//Math.getExponent (17.0) = 4