Big Data <javase + Linux Elite Training class >_day_07

1: Basic grammar--ASCII encoded table        Computer World,01-> binary                How many countries are there in the world? What statement         does each country use? Computers are used all over the world.                United States: The computer can directly recognize the human character                letter a corresponds to the decimal 97, the uppercase letter a corresponds to the decimal is the                American guy: A-Z A-    z    0-9    [email protected ]#$%, such as                a in the hard disk storage is not a, is a corresponding to the value of 97 of the binary                commonly used ASCII encoding table: The                    number 0-9 corresponding ASCII encoding decimal 48-57 , the letter A-Z corresponds to 97-122, the letter A-Z corresponds to the 65-90.                        China: start to make its own code table                let decimal number, corresponding to a Chinese character                Simplified Chinese    Code   --GB corresponding Chinese characters less                                    upgrade to GBK                                            Universal code: International Standard ISO (all Languages compatible asctii encoding table)      Unicode

 Public classasciidemo{/*when Char is converted to an int type, the type is automatically promoted, and the char data type is queried for the encoded table, resulting in an integer*/     Public Static voidMain (string[] args) {Charc = ' a '; inti = C + 1;        System.out.println (i); //98                        intj = 90; //Forcing type conversions            CharH = (Char) J;  System.out.println (h); //ZSystem.out.println ((Char) 6); Chark = ' You ';                        System.out.println (k); //range of char types: 0-65535            Charn = 65534; }}

2:storage        of char type, base syntax, char        int

 Public classlooptest{ Public Static voidMain (string[] args) {/*output All English letters 1, lowercase 2, uppercase                                         52 using coded tables to achieve A-Z 65-90 A-Z 97--122                            Ideas: 1, define variables, save lowercase A, save capital a 2, loop 26 times, output defined variables Each cycle, variable + +*/            //define variables to hold letters            CharXiaoxie = ' a '; CharDaxie = ' A '; //Loops             for(inti = 0;i < 26;i++) {System.out.println (Xiaoxie+ "    " +Daxie); Daxie++; Xiaoxie++; }    }}

 Public classtest99{ Public Static voidMain (string[] args) {/*1 * 1 = 1 1 * 2 = 2 2 * 2 = 4 1 * 3 = 3 2 * 3 = 6 3 * 3 = 9*/         for(inti = 1;i <= 9;i++){             for(intj = 1;j <= i;j++){                //print in standard formatSystem.out.print (j + "*" + i + "=" + I * j + "\ T")

 3: The use of tools: Eclipse idea NetBeans Benefits: free, no copyright, with use. Open source (Eclipse source), downloadable plug-in (strong extensibility), Green software -> unzip to use  4:eclipse shortcut key: ATL  +/ auto complete Ctrl  +/ single-line comment cancel single-line comment Ctrl  + Shift +/ Multiline comment Ctrl  + shift + \ Cancel Multiline Comment Ctrl  + SHIFT +
   
     o Import Package selected line Alt  +
     up and down arrows move this line of code Ctrl 
     + D delete Current line Ctrl  + 1 viewing tips CTRL  + 2 R unified Rename Ctrl  + 2 L receive return value 
   

 package   Com.itstaredu.demo;  import   Java.util.Scanner;  public  class   HelloWorld { public  static  void   main (string[] args) {  // atl +/shortcut  System.out.println ("        HelloWorld ");        Scanner sr  = new   Scanner (system.in);  for  (int  i = 0; i < args.length; i++ ) {}}}  

Big Data <javase + Linux Elite Training class >_day_07