Explain << and >>

Question

I know binary and I know these have to do something with binary, but I don‘t actually know how they work or where someone would use them.

Answer 1

They are bitshifters, they "move" the bits up or down so that 101 would become 1010 or 10 respectively.
It can be used as flags for various properties:
int flag = 0;
if hasProperty1
flag += 1
flag << 1
if has property 2
flag += 1
flag << 1
etc.

in the binary representation this would be a series of 1s and 0s which we can use & (bitwise AND) to identify these flags.
This is used in the Java Reflection package, all of the modifiers for a variable or method declaration have a number flag and you can get the method and do stuff like method.isFinal() or method.isPublic() which uses these <<

In a maths setting working with powers of 2 they can be quite efficient I think

Answer 2

bitwise operators. very seldom used.

Answer 3

hi,
you can use it to create a "chenillard". Sorry i don't know his name in english.
if you want display 3 news one by one, give a value 1, 2, 4 and use << to select news and loop