ykrsm

tl;dr

1. You can check color by :hi
2. Change colors in your .vimrc

" Reset the background color in Normal mode so vim uses Terminal.app's background color"
highlight Normal ctermbg=none
" Reset the background color in Non Text area so vim uses Terminal.app's background color"
highlight NonText ctermbg=none

ykrsm

what does “>>>” mean in java?

https://stackoverflow.com/questions/19058859/what-does-mean-in-java

maximum and minimum values for numeric types

Integer.MIN_VALUE: -2147483648 == -2^31
Integer.MAX_VALUE: 2147483647 == 2^31-1
Float.MIN_VALUE: 1.4E-45 == 2^-149
Float.MAX_VALUE: 3.4028235E38 === (2-2^-23)·2^127
Double.MIN_VALUE: 4.9E-324 == 2^-1074