Attach a D or d to double literals, but it is not necessary. : double « Java Source And Data Type « SCJP

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SCJP » Java Source And Data Type » double 
1.14.1.Attach a D or d to double literals, but it is not necessary.
public class MainClass{
    public static void main(String[] argv){
        double d = 1.1D// Optional, not required
        double g = 987.897;       // No 'D' suffix, but OK because the literal is a double by default

        System.out.println(d);
        System.out.println(g);
    }
}
1.14.double
1.14.1.Attach a D or d to double literals, but it is not necessary.
1.14.2.NaN values indicates that a calculation has no result in ordinary arithmetic
1.14.3.A value containing a decimal point is assumed to be the 64-bit double,
1.14.4.Division by zero in floating-point-arithmetic: No exception occurs;
1.14.5.See if a floating-point result is NaN, use the Float.isNaN or Double.isNaN static method.
1.14.6.Float and Double classes define MAX_VALUE, MIN_VALUE, POSITIVE_INFINITY, and NEGATIVE_INFINITY.
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