Sybex 1Z0-815, Chapter 2 - Writing Literals

[Cristina Kiss]

In my honest opinion, the book should mention the default type when writing literals for decimal numbers: double

Source: https://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html

The book only specifies the default type assumed by the compiler for integer numeric literals (int).

[Campbell Ritchie]

CK: Welcome to the Ranch

[Cristina Kiss]

Hello again,

Thank you !

I just wanted to point out that in Chapter 2 it is not explained in any way that floating-point numeric literals that appear in a piece of code are interpreted (default to) double.

Furthermore, Chapter 3 refers to this concept, which is a bit misleading:
" As you may remember from Chapter 2, floating-point literals are assumed to be double, unless postfixed with an f, as in 2.1f (Boyarsky, 20191119, p. 89)

Boyarsky, J., Selikoff, S.  (20191119). OCP Oracle Certified Professional Java SE 11 Programmer I Study Guide [VitalSource Bookshelf version].  Retrieved from vbk://9781119584568

Always check citation for accuracy before use.
"

What do you guys think ?

Thanks,
Cristina.

[Jeanne Boyarsky]

Table 2.1 has an example of 123.45f.  Table 2.3  (page 53) has a a table with the default types. It lists 0.0 for both float and double. We intentionally don't cover 0.0f vs 0.0d there because we are trying to illustrate the principle of a floating vs integer type there. And we cover that a smaller type can be stored in a larger type. So looks good to me!