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Java provides 22 possible narrowing primitive conversions. According to The Java Language Languagee Specification (JLS), §5.1.3, "Narrowing Primitive Conversions" [JLS 20052015]:

• short to byte or char
• char to byte or short
• int to byte, short, or char
• long to byte, short, char, or int
• float to byte, short, char, int, or long
• double to byte, short, char, int, long, or float

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Integer type ranges are defined by the JLS, §4.2.1, "Integral Types and Values" [JLS 20052015], and are also described in NUM00-J. Detect or prevent integer overflow.

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Bibliography

[Harold 1999]
[JLS 2005]	§4.2.1, "Integral Types and Values" §5.1.3, "Narrowing Primitive Conversions"
[Seacord 2015]	NUM12-J. Ensure conversions of numeric types to narrower types do not result in lost or misinterpreted data LiveLesson

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