LEARNING JAVA v4

LEARNING JAVA
Published with SteemPeak

Screenshot by Willi Glenz

UPDATE v4

006 VIM

:!javac % && java ClassName
> or
:set makeprg=javac
:make % && java ClassName

005 OPERATORS

Arithmetic      + - * / & ++ --
Relational      == != > < >= <=
Bitwise         & | ^ ~ << >> >>>
Logical         && || !
Assignment      = += -= *= /= %= <<= >>=  &= ^= |=
Miscellaneous   ?: instanceof

004 VIMRC

$ vim ~/.vimrc
> " GENERAL
> syntax on
> filetype on
> filetype plugin on
> set laststatus=2
> set colorcolumn=80
> set nocompatible
> set number
> set relativenumber
> "set cursorline
> set incsearch
> set hlsearch
> set showmode
> set ruler
> set linebreak
> set showcmd
> set mouse=a
> set background=dark
> set encoding=utf8
> 
> " INDENT
> set autoindent
> 
> " TABs
> set tabstop=3
> set softtabstop=3
> set shiftwidth=3
> set expandtab
>
> " JAVA
> set makeprg=javac
> 
> " MAPs
> :nmap <leader>w :w!<cr>
> :map <F2> :echo 'Current time is ' . strftime('%c')<CR>
> :map <F5> :set list!<CR>
> :map <F6> :setlocal spell! spelllang=en_us<CR>
> :ab psv public static void(String[] args) {<cr>}<esc>ko
> :ab sout System.out.println(

003 BASIC CLI-SNIPPET

public class Main {
   private String msg;

   public Main() {
      super();
      this.msg = "Hello World!";
   }

   public static void main(String[] args) {
      Main phoenix = new Main();
      phoenix.run();
   }

   public void run() {
      System.out.println(msg);
   }

}

002 PRIMITIVE DATA TYPES

TYPE        SIZE    RANGE                   DEFAULT CLASS&FIELD
byte        8 bit   -2^7 to 2^7 -1          0
short       16 bit  -2^15 to 2^15 -1        0
int         32-bit  -2^31 to 2^31 -1        0       Integer.MIN_VALUE to Integer.MAX_VALUE
long        64 bit  -2^63 to 2^63-1         0L
float       32 bit  -3.4E38 to 3.4E38       0f
double      64 bit  -1.7E308 to 1.7E308     0d
char        16 bit  '\u0000' to '\uffff'    '\u0000'
                    (0 to 65,565)
boolean     1 bit                           false

001 SOURCES

Bradley Kjell   chortle.ccsu.edu/java5/index.html
TutorialsPoint  www.tutorialspoint.com/java/index.htm
JavaTpoint      www.javatpoint.com/java-tutorial
IdeOne          ideone.com