Reference: Griffiths and Griffiths, Head First Android Development, 2nd Ed., O'Reilly, 2017.
.java → .class
.java → .class → classes.dex
app/build/immediates/dex/debug/out
data/app/it372/smiths/myapp/
Hex: 64 65 78 0a 30 33 39 00 ASCII: d e x \n 0 3 9 \0
Greek letters: αβγUse this ASCII Table and Hex Digits Table.