Java Learning notes--bitwise operators, methods, package packages, keyboard input

Bitwise operators:

A>>b = A left shift b bit = a*2^2

Move right down.

Method:

Method,function, similar to the C function

Package Packages:

Usually the first sentence

Write the domain name backwards write

Package ...;

Main package:

Java.lang Core class string, math, Integer, System, thread, etc.

java.awt Building a management GUI

java.net Network related

java.io Input/Output

Java.util defining system attributes, using functions related to date calendars

(See API)

Keyboard input:

Classes that use other packages require import

Import package name. class name;

Scanner:

Scanner s = new Scanner (system.in "console input stream");

S "Flow of the head pointer"

s.next* () "Next * type input stream, separated by spaces"

Java Learning notes--bitwise operators, methods, package packages, keyboard input