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Principles of Computer
         Programming
                     Caucasus School of Technology




Ioseb Dzmanashvili, http://code.ge
Senior Software Architect, Picktek LLC


                      "Until programmers stop acting like obfuscation is morally
             hazardous, theyโ€™re not artists, just kids who donโ€™t want their food to
                                                                   touch." ยฉ _why
แƒ“แƒฆแƒ”แƒ•แƒแƒœแƒ“แƒ”แƒšแƒ˜ แƒ’แƒแƒœแƒฎแƒ˜แƒšแƒ•แƒ˜แƒก แƒ—แƒ”แƒ›แƒ”แƒ‘แƒ˜


โ€ข   แƒชแƒ•แƒšแƒแƒ“แƒ”แƒ‘แƒ˜. แƒชแƒ•แƒšแƒแƒ“แƒ”แƒ‘แƒ˜แƒก แƒแƒฆแƒฌแƒ”แƒ แƒ แƒ“แƒ
    แƒ›แƒœแƒ˜แƒจแƒ•แƒœแƒ”แƒšแƒแƒ‘แƒ”แƒ‘แƒ˜แƒก แƒ›แƒ˜แƒœแƒ˜แƒญแƒ”แƒ‘แƒ.

โ€ข   แƒžแƒ แƒ˜แƒ›แƒ˜แƒขแƒ˜แƒฃแƒšแƒ˜ แƒ“แƒ แƒแƒ‘แƒ˜แƒ”แƒฅแƒขแƒฃแƒ แƒ˜ แƒขแƒ˜แƒžแƒ”แƒ‘แƒ˜.

โ€ข   แƒ›แƒแƒ™แƒแƒœแƒขแƒ แƒแƒšแƒ”แƒ‘แƒ”แƒšแƒ˜ แƒกแƒขแƒ แƒฃแƒฅแƒขแƒฃแƒ แƒ”แƒ‘แƒ˜
แƒชแƒ•แƒšแƒแƒ“แƒ˜ แƒจแƒ”แƒ˜แƒซแƒšแƒ”แƒ‘แƒ แƒจแƒ”แƒ•แƒแƒ“แƒแƒ แƒแƒ—
          แƒฃแƒฏแƒ แƒแƒก
แƒ—แƒฃแƒ›แƒชแƒ แƒชแƒ•แƒšแƒแƒ“แƒ˜ แƒฃแƒœแƒ“แƒ แƒแƒ™แƒ›แƒแƒงแƒแƒคแƒ˜แƒšแƒ”แƒ‘แƒ“แƒ”แƒก
     แƒจแƒ”แƒกแƒแƒ‘แƒแƒ›แƒ˜แƒก แƒ›แƒแƒฎแƒแƒกแƒ˜แƒแƒ—แƒ”แƒ‘แƒšแƒ”แƒ‘แƒก



                    โ€ข   แƒขแƒ˜แƒžแƒ˜.
                        int, boolean, String

                    โ€ข   แƒกแƒแƒฎแƒ”แƒšแƒ˜.
                        age, sex, location

                    โ€ข   แƒ–แƒแƒ›แƒ.
                        แƒ“แƒแƒ›แƒแƒ™แƒ˜แƒ“แƒ”แƒ‘แƒฃแƒšแƒ˜แƒ แƒขแƒ˜แƒžแƒ–แƒ”


                    โ€ข   แƒ›แƒœแƒ˜แƒจแƒ•แƒœแƒ”แƒšแƒแƒ‘แƒ
                        แƒขแƒ˜แƒžแƒ˜แƒก แƒจแƒ”แƒกแƒแƒ‘แƒแƒ›แƒ˜แƒกแƒ˜ แƒ›แƒœแƒ˜แƒจแƒ•แƒœแƒ”แƒšแƒแƒ‘แƒ
แƒชแƒ•แƒšแƒแƒ“แƒ˜แƒก แƒแƒฆแƒฌแƒ”แƒ แƒ˜แƒก แƒ›แƒแƒ’แƒแƒšแƒ˜แƒ—แƒ”แƒ‘แƒ˜


//แƒกแƒขแƒ แƒ˜แƒฅแƒแƒœแƒฃแƒšแƒ˜ แƒขแƒ˜แƒžแƒ˜
String name = โ€œแƒ’แƒ˜แƒแƒ แƒ’แƒ˜โ€;

//แƒ›แƒ—แƒ”แƒšแƒ˜ แƒ แƒ˜แƒชแƒฎแƒ•แƒ˜แƒก แƒขแƒ˜แƒžแƒ˜
int age = 28;

//แƒ›แƒ—แƒ”แƒšแƒ˜ แƒ แƒ˜แƒชแƒฎแƒ•แƒ˜แƒก แƒขแƒ˜แƒžแƒ˜
int weight = 80;

//แƒšแƒแƒ’แƒ˜แƒ™แƒฃแƒ แƒ˜ แƒขแƒ˜แƒžแƒ˜
boolean hasCar = true;
แƒชแƒ•แƒšแƒแƒ“แƒ”แƒ‘แƒ˜ แƒ˜แƒœแƒแƒฎแƒ”แƒ‘แƒ แƒกแƒžแƒ”แƒชแƒ˜แƒแƒšแƒฃแƒ แƒแƒ“ แƒ’แƒแƒ›แƒแƒงแƒแƒคแƒ˜แƒš
              แƒ›แƒ”แƒฎแƒกแƒ˜แƒ”แƒ แƒ”แƒ‘แƒแƒจแƒ˜




                 โ€ข   แƒงแƒแƒ•แƒ”แƒšแƒ˜ แƒชแƒ•แƒšแƒแƒ“แƒ˜ แƒ˜แƒœแƒแƒฎแƒ”แƒ‘แƒ
                     แƒ›แƒ”แƒฎแƒกแƒ˜แƒ”แƒ แƒ”แƒ‘แƒ˜แƒก แƒ™แƒแƒœแƒ™แƒ แƒ”แƒขแƒฃแƒš
                     แƒ›แƒ˜แƒกแƒแƒ›แƒแƒ แƒ—แƒ–แƒ”

                 โ€ข   แƒงแƒแƒ•แƒ”แƒšแƒ˜ แƒชแƒ•แƒšแƒแƒ“แƒ˜ แƒ˜แƒ™แƒแƒ•แƒ”แƒ‘แƒก แƒ—แƒแƒ•แƒ˜แƒกแƒ˜
                     แƒขแƒ˜แƒžแƒ˜แƒก แƒจแƒ”แƒกแƒแƒ‘แƒแƒ›แƒ˜แƒก แƒแƒ“แƒ’แƒ˜แƒšแƒก
                     แƒ›แƒ”แƒฎแƒกแƒ˜แƒ”แƒ แƒ”แƒ‘แƒแƒจแƒ˜
Java - แƒจแƒ˜ แƒแƒ แƒกแƒ”แƒ‘แƒแƒ‘แƒก แƒ›แƒแƒœแƒแƒชแƒ”แƒ›แƒ—แƒ แƒแƒ แƒ˜
              แƒซแƒ˜แƒ แƒ˜แƒ—แƒแƒ“แƒ˜ แƒขแƒ˜แƒžแƒ˜



โ€ข แƒžแƒ แƒ˜แƒ›แƒ˜แƒขแƒ˜แƒฃแƒšแƒ˜ แƒขแƒ˜แƒžแƒ”แƒ‘แƒ˜
 char, byte, short, int, long, ๏ฌ‚oat, double,
 boolean

โ€ข แƒแƒ‘แƒ˜แƒ”แƒฅแƒขแƒฃแƒ แƒ˜ แƒขแƒ˜แƒžแƒ”แƒ‘แƒ˜
 String, array แƒ“แƒ แƒœแƒ”แƒ‘แƒ˜แƒกแƒ›แƒ˜แƒ”แƒ แƒ˜ แƒ™แƒšแƒแƒกแƒ˜แƒก แƒขแƒ˜แƒžแƒ˜
แƒžแƒ แƒ˜แƒ›แƒ˜แƒขแƒ˜แƒฃแƒšแƒ˜ แƒขแƒ˜แƒžแƒ”แƒ‘แƒ˜
  แƒขแƒ˜แƒžแƒ˜      แƒ–แƒแƒ›แƒ           min                      max

 char     16 - bit          0                     65,535
 byte      8 - bit        -128                      127
 short    16 - bit      -32,768                   32,767
  int     32 - bit   -2,147,483,648        2,147,483,647
 long     64 - bit        -2 63                   +263 - 1
 ๏ฌ‚oat     32 - bit     32 แƒ‘แƒ˜แƒขแƒ˜แƒแƒœแƒ˜ IEEE 754 แƒœแƒแƒ›แƒ“แƒ•แƒ˜แƒšแƒ˜ แƒ แƒ˜แƒชแƒฎแƒ•แƒ˜

double    64 - bit     64 แƒ‘แƒ˜แƒขแƒ˜แƒแƒœแƒ˜ IEEE 754 แƒœแƒแƒ›แƒ“แƒ•แƒ˜แƒšแƒ˜ แƒ แƒ˜แƒชแƒฎแƒ•แƒ˜

boolean    1 - bit                true แƒแƒœ false
แƒ‘แƒ˜แƒขแƒ”แƒ‘แƒ˜ แƒ“แƒ แƒ‘แƒแƒ˜แƒขแƒ”แƒ‘แƒ˜

                    1 แƒ‘แƒแƒ˜แƒขแƒ˜ = 8 แƒ‘แƒ˜แƒขแƒ˜
แƒ‘แƒ˜แƒขแƒ˜แƒก แƒ˜แƒœแƒ“แƒ”แƒฅแƒกแƒ˜          7 6 5 4 3 2 1      0
แƒ‘แƒ˜แƒขแƒ˜แƒก แƒ›แƒœแƒ˜แƒจแƒ•แƒœแƒ”แƒšแƒแƒ‘แƒ    128 64 32 16 8 4 2   1
                       1 1 1 1 1 1 1      1 = 256


                    1 แƒ‘แƒแƒ˜แƒขแƒ˜ = 8 แƒ‘แƒ˜แƒขแƒ˜
แƒ‘แƒ˜แƒขแƒ˜แƒก แƒ˜แƒœแƒ“แƒ”แƒฅแƒกแƒ˜          7 6 5 4 3 2 1      0
แƒ‘แƒ˜แƒขแƒ˜แƒก แƒ›แƒœแƒ˜แƒจแƒ•แƒœแƒ”แƒšแƒแƒ‘แƒ    128 64 32 16 8 4 2   1
                       0 0 0 0 0 1 1      0 = ???
แƒšแƒแƒ™แƒแƒšแƒฃแƒ แƒ˜ แƒ“แƒ แƒแƒ‘แƒ˜แƒ”แƒฅแƒขแƒ˜แƒก
            แƒชแƒ•แƒšแƒแƒ“แƒ”แƒ‘แƒ˜


โ€ข   แƒšแƒแƒ™แƒแƒšแƒฃแƒ แƒ˜ - แƒ”แƒฌแƒแƒ“แƒ”แƒ‘แƒ แƒ›แƒ”แƒ—แƒแƒ“แƒ˜แƒก แƒจแƒ˜แƒ’แƒœแƒ˜แƒ— แƒแƒฆแƒฌแƒ”แƒ แƒ˜แƒš แƒœแƒ”แƒ‘แƒ˜แƒกแƒ›แƒ˜แƒ”แƒ 
    แƒชแƒ•แƒšแƒแƒ“แƒก.

โ€ข   แƒแƒ‘แƒ˜แƒ”แƒฅแƒขแƒ˜แƒก - แƒ”แƒฌแƒแƒ“แƒ”แƒ‘แƒ แƒ™แƒšแƒแƒกแƒ˜แƒก แƒชแƒ•แƒšแƒแƒ“แƒก แƒ แƒแƒ›แƒ”แƒšแƒ–แƒ” แƒฌแƒ•แƒ“แƒแƒ›แƒแƒช
    แƒจแƒ”แƒฃแƒซแƒšแƒ”แƒ‘แƒ”แƒšแƒ˜แƒ แƒ™แƒšแƒแƒกแƒ˜แƒก แƒแƒ‘แƒ˜แƒ”แƒฅแƒขแƒ˜แƒก แƒแƒ แƒกแƒ”แƒ‘แƒแƒ‘แƒ˜แƒก แƒ’แƒแƒ แƒ”แƒจแƒ”.

โ€ข   แƒšแƒแƒ™แƒแƒšแƒฃแƒ แƒ˜ แƒชแƒ•แƒšแƒแƒ“แƒ”แƒ‘แƒ˜ แƒงแƒแƒ•แƒ”แƒšแƒ—แƒ•แƒ˜แƒก แƒ˜แƒœแƒแƒฎแƒ”แƒ‘แƒ แƒกแƒขแƒ”แƒ™แƒจแƒ˜(Stack)

โ€ข   แƒแƒ‘แƒ˜แƒ”แƒฅแƒขแƒ˜แƒก แƒชแƒ•แƒšแƒแƒ“แƒ”แƒ‘แƒ˜ แƒงแƒแƒ•แƒ”แƒšแƒ—แƒ•แƒ˜แƒก แƒ˜แƒœแƒแƒฎแƒ”แƒ‘แƒ แƒ’แƒ แƒแƒ•แƒแƒจแƒ˜(Heap)
Stack & Heap
                              Heap
Stack

Variable 1             Object 1               Object 5

Variable 2

Variable 3                        Object 3
                  Object 6                        Object 4
Variable 4

Variable 5
                                   Object 1
แƒšแƒแƒ™แƒแƒšแƒฃแƒ แƒ˜ แƒ“แƒ แƒแƒ‘แƒ˜แƒ”แƒฅแƒขแƒ˜แƒก
             แƒชแƒ•แƒšแƒแƒ“แƒ”แƒ‘แƒ˜
                       แƒแƒ‘แƒ˜แƒ”แƒฅแƒขแƒ˜แƒก แƒชแƒ•แƒšแƒแƒ“แƒ”แƒ‘แƒ˜
public class TestClass {
   public String name;
   public int age;
   public String gender;
}

                      แƒšแƒแƒ™แƒแƒšแƒฃแƒ แƒ˜ แƒชแƒ•แƒšแƒแƒ“แƒ”แƒ‘แƒ˜
public static void main(String[] args) {
   String name = โ€œแƒ’แƒ˜แƒแƒ แƒ’แƒ˜โ€;
   int age = 22;
   String gender = โ€œmailโ€;
   //TestClass แƒแƒ‘แƒ˜แƒ”แƒฅแƒขแƒ˜แƒก แƒแƒฆแƒฌแƒ”แƒ แƒ
   TestClass test = new TestClass();
   test.name = โ€œแƒกแƒแƒ‘แƒโ€
   test.age = 18;
   test.name = โ€œmaleโ€
}
แƒšแƒแƒ™แƒแƒšแƒฃแƒ แƒ˜ แƒ“แƒ แƒแƒ‘แƒ˜แƒ”แƒฅแƒขแƒ˜แƒก แƒชแƒ•แƒšแƒแƒ“แƒ”แƒ‘แƒ˜
               แƒ›แƒ”แƒฎแƒกแƒ˜แƒ”แƒ แƒ”แƒ‘แƒแƒจแƒ˜


                              Heap
   Stack
  main แƒ›แƒ”แƒ—แƒแƒ“แƒ˜แƒก
แƒšแƒแƒ™แƒแƒšแƒฃแƒ แƒ˜ แƒชแƒ•แƒšแƒแƒ“แƒ”แƒ‘แƒ˜             โ€œแƒ’แƒ˜แƒแƒ แƒ’แƒ˜โ€


     name            โ€œmaleโ€
                                     TestClass
                                    แƒแƒ‘แƒ˜แƒ”แƒฅแƒขแƒ˜
    age = 22
                                name = โ€œแƒกแƒแƒ‘แƒโ€
                                age = 18
    gender
                                  name =
      test
Stack & Heap
             Heap
Stack
The Simpsons



    }
           แƒกแƒ˜แƒ›แƒžแƒกแƒแƒœแƒ”แƒ‘แƒ˜แƒก แƒแƒฏแƒแƒฎแƒ˜แƒก
        แƒชแƒแƒšแƒ™แƒ”แƒฃแƒšแƒ˜ แƒฌแƒ”แƒ•แƒ แƒ˜ แƒจแƒ”แƒ’แƒ•แƒ˜แƒซแƒšแƒ˜แƒ
        แƒแƒฆแƒ•แƒฌแƒ”แƒ แƒแƒ— แƒจแƒ”แƒ›แƒ“แƒ”แƒ’แƒ˜ แƒ™แƒšแƒแƒกแƒ˜แƒ—




        public class Simpson {
           public String name;
           public int age;
           public String gender;
        }
แƒแƒฎแƒšแƒ แƒฃแƒ™แƒ•แƒ” แƒจแƒ”แƒ’แƒ•แƒ˜แƒซแƒšแƒ˜แƒ แƒจแƒ”แƒ•แƒฅแƒ›แƒœแƒแƒ— แƒแƒฏแƒแƒฎแƒ˜แƒก
       แƒฌแƒ”แƒ•แƒ แƒ”แƒ‘แƒ˜ Java แƒแƒ‘แƒ˜แƒ”แƒฅแƒขแƒ”แƒ‘แƒ˜แƒก แƒกแƒแƒฎแƒ˜แƒ—

public static void main(String[] args) {

      Simpson bart = new Simpson();
      bart. name = โ€œBartโ€;
      bart. age = 12;
      bart. gender = โ€œmaleโ€;


      Simpson homer = new Simpson();
      homer. name = โ€œHomerโ€;
      homer. age = 45;
      homer. gender = โ€œmaleโ€;


}
แƒกแƒ˜แƒ›แƒžแƒกแƒแƒœแƒ”แƒ‘แƒ˜แƒก แƒแƒฏแƒแƒฎแƒ˜แƒก แƒฌแƒ”แƒ•แƒ แƒ”แƒ‘แƒ˜ แƒ’แƒแƒ›แƒแƒงแƒแƒคแƒ˜แƒš
             แƒ›แƒ”แƒฎแƒกแƒ˜แƒ”แƒ แƒ”แƒ‘แƒแƒจแƒ˜


                  Heap
Stack
                 Simpson
             name = โ€œBartโ€
             age = 12;
             gender = โ€œmaleโ€;


 bart
                 Simpson
homer        name = โ€œHomerโ€
             age = 45;
             gender = โ€œmaleโ€;
แƒจแƒ”แƒ™แƒ˜แƒ—แƒฎแƒ•แƒ”แƒ‘แƒ˜?
แƒ“แƒ˜แƒ“แƒ˜ แƒ›แƒแƒ“แƒšแƒแƒ‘แƒ!

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Java variables

  • 1. Principles of Computer Programming Caucasus School of Technology Ioseb Dzmanashvili, http://code.ge Senior Software Architect, Picktek LLC "Until programmers stop acting like obfuscation is morally hazardous, theyโ€™re not artists, just kids who donโ€™t want their food to touch." ยฉ _why
  • 2. แƒ“แƒฆแƒ”แƒ•แƒแƒœแƒ“แƒ”แƒšแƒ˜ แƒ’แƒแƒœแƒฎแƒ˜แƒšแƒ•แƒ˜แƒก แƒ—แƒ”แƒ›แƒ”แƒ‘แƒ˜ โ€ข แƒชแƒ•แƒšแƒแƒ“แƒ”แƒ‘แƒ˜. แƒชแƒ•แƒšแƒแƒ“แƒ”แƒ‘แƒ˜แƒก แƒแƒฆแƒฌแƒ”แƒ แƒ แƒ“แƒ แƒ›แƒœแƒ˜แƒจแƒ•แƒœแƒ”แƒšแƒแƒ‘แƒ”แƒ‘แƒ˜แƒก แƒ›แƒ˜แƒœแƒ˜แƒญแƒ”แƒ‘แƒ. โ€ข แƒžแƒ แƒ˜แƒ›แƒ˜แƒขแƒ˜แƒฃแƒšแƒ˜ แƒ“แƒ แƒแƒ‘แƒ˜แƒ”แƒฅแƒขแƒฃแƒ แƒ˜ แƒขแƒ˜แƒžแƒ”แƒ‘แƒ˜. โ€ข แƒ›แƒแƒ™แƒแƒœแƒขแƒ แƒแƒšแƒ”แƒ‘แƒ”แƒšแƒ˜ แƒกแƒขแƒ แƒฃแƒฅแƒขแƒฃแƒ แƒ”แƒ‘แƒ˜
  • 4. แƒ—แƒฃแƒ›แƒชแƒ แƒชแƒ•แƒšแƒแƒ“แƒ˜ แƒฃแƒœแƒ“แƒ แƒแƒ™แƒ›แƒแƒงแƒแƒคแƒ˜แƒšแƒ”แƒ‘แƒ“แƒ”แƒก แƒจแƒ”แƒกแƒแƒ‘แƒแƒ›แƒ˜แƒก แƒ›แƒแƒฎแƒแƒกแƒ˜แƒแƒ—แƒ”แƒ‘แƒšแƒ”แƒ‘แƒก โ€ข แƒขแƒ˜แƒžแƒ˜. int, boolean, String โ€ข แƒกแƒแƒฎแƒ”แƒšแƒ˜. age, sex, location โ€ข แƒ–แƒแƒ›แƒ. แƒ“แƒแƒ›แƒแƒ™แƒ˜แƒ“แƒ”แƒ‘แƒฃแƒšแƒ˜แƒ แƒขแƒ˜แƒžแƒ–แƒ” โ€ข แƒ›แƒœแƒ˜แƒจแƒ•แƒœแƒ”แƒšแƒแƒ‘แƒ แƒขแƒ˜แƒžแƒ˜แƒก แƒจแƒ”แƒกแƒแƒ‘แƒแƒ›แƒ˜แƒกแƒ˜ แƒ›แƒœแƒ˜แƒจแƒ•แƒœแƒ”แƒšแƒแƒ‘แƒ
  • 5. แƒชแƒ•แƒšแƒแƒ“แƒ˜แƒก แƒแƒฆแƒฌแƒ”แƒ แƒ˜แƒก แƒ›แƒแƒ’แƒแƒšแƒ˜แƒ—แƒ”แƒ‘แƒ˜ //แƒกแƒขแƒ แƒ˜แƒฅแƒแƒœแƒฃแƒšแƒ˜ แƒขแƒ˜แƒžแƒ˜ String name = โ€œแƒ’แƒ˜แƒแƒ แƒ’แƒ˜โ€; //แƒ›แƒ—แƒ”แƒšแƒ˜ แƒ แƒ˜แƒชแƒฎแƒ•แƒ˜แƒก แƒขแƒ˜แƒžแƒ˜ int age = 28; //แƒ›แƒ—แƒ”แƒšแƒ˜ แƒ แƒ˜แƒชแƒฎแƒ•แƒ˜แƒก แƒขแƒ˜แƒžแƒ˜ int weight = 80; //แƒšแƒแƒ’แƒ˜แƒ™แƒฃแƒ แƒ˜ แƒขแƒ˜แƒžแƒ˜ boolean hasCar = true;
  • 6. แƒชแƒ•แƒšแƒแƒ“แƒ”แƒ‘แƒ˜ แƒ˜แƒœแƒแƒฎแƒ”แƒ‘แƒ แƒกแƒžแƒ”แƒชแƒ˜แƒแƒšแƒฃแƒ แƒแƒ“ แƒ’แƒแƒ›แƒแƒงแƒแƒคแƒ˜แƒš แƒ›แƒ”แƒฎแƒกแƒ˜แƒ”แƒ แƒ”แƒ‘แƒแƒจแƒ˜ โ€ข แƒงแƒแƒ•แƒ”แƒšแƒ˜ แƒชแƒ•แƒšแƒแƒ“แƒ˜ แƒ˜แƒœแƒแƒฎแƒ”แƒ‘แƒ แƒ›แƒ”แƒฎแƒกแƒ˜แƒ”แƒ แƒ”แƒ‘แƒ˜แƒก แƒ™แƒแƒœแƒ™แƒ แƒ”แƒขแƒฃแƒš แƒ›แƒ˜แƒกแƒแƒ›แƒแƒ แƒ—แƒ–แƒ” โ€ข แƒงแƒแƒ•แƒ”แƒšแƒ˜ แƒชแƒ•แƒšแƒแƒ“แƒ˜ แƒ˜แƒ™แƒแƒ•แƒ”แƒ‘แƒก แƒ—แƒแƒ•แƒ˜แƒกแƒ˜ แƒขแƒ˜แƒžแƒ˜แƒก แƒจแƒ”แƒกแƒแƒ‘แƒแƒ›แƒ˜แƒก แƒแƒ“แƒ’แƒ˜แƒšแƒก แƒ›แƒ”แƒฎแƒกแƒ˜แƒ”แƒ แƒ”แƒ‘แƒแƒจแƒ˜
  • 7. Java - แƒจแƒ˜ แƒแƒ แƒกแƒ”แƒ‘แƒแƒ‘แƒก แƒ›แƒแƒœแƒแƒชแƒ”แƒ›แƒ—แƒ แƒแƒ แƒ˜ แƒซแƒ˜แƒ แƒ˜แƒ—แƒแƒ“แƒ˜ แƒขแƒ˜แƒžแƒ˜ โ€ข แƒžแƒ แƒ˜แƒ›แƒ˜แƒขแƒ˜แƒฃแƒšแƒ˜ แƒขแƒ˜แƒžแƒ”แƒ‘แƒ˜ char, byte, short, int, long, ๏ฌ‚oat, double, boolean โ€ข แƒแƒ‘แƒ˜แƒ”แƒฅแƒขแƒฃแƒ แƒ˜ แƒขแƒ˜แƒžแƒ”แƒ‘แƒ˜ String, array แƒ“แƒ แƒœแƒ”แƒ‘แƒ˜แƒกแƒ›แƒ˜แƒ”แƒ แƒ˜ แƒ™แƒšแƒแƒกแƒ˜แƒก แƒขแƒ˜แƒžแƒ˜
  • 8. แƒžแƒ แƒ˜แƒ›แƒ˜แƒขแƒ˜แƒฃแƒšแƒ˜ แƒขแƒ˜แƒžแƒ”แƒ‘แƒ˜ แƒขแƒ˜แƒžแƒ˜ แƒ–แƒแƒ›แƒ min max char 16 - bit 0 65,535 byte 8 - bit -128 127 short 16 - bit -32,768 32,767 int 32 - bit -2,147,483,648 2,147,483,647 long 64 - bit -2 63 +263 - 1 ๏ฌ‚oat 32 - bit 32 แƒ‘แƒ˜แƒขแƒ˜แƒแƒœแƒ˜ IEEE 754 แƒœแƒแƒ›แƒ“แƒ•แƒ˜แƒšแƒ˜ แƒ แƒ˜แƒชแƒฎแƒ•แƒ˜ double 64 - bit 64 แƒ‘แƒ˜แƒขแƒ˜แƒแƒœแƒ˜ IEEE 754 แƒœแƒแƒ›แƒ“แƒ•แƒ˜แƒšแƒ˜ แƒ แƒ˜แƒชแƒฎแƒ•แƒ˜ boolean 1 - bit true แƒแƒœ false
  • 9. แƒ‘แƒ˜แƒขแƒ”แƒ‘แƒ˜ แƒ“แƒ แƒ‘แƒแƒ˜แƒขแƒ”แƒ‘แƒ˜ 1 แƒ‘แƒแƒ˜แƒขแƒ˜ = 8 แƒ‘แƒ˜แƒขแƒ˜ แƒ‘แƒ˜แƒขแƒ˜แƒก แƒ˜แƒœแƒ“แƒ”แƒฅแƒกแƒ˜ 7 6 5 4 3 2 1 0 แƒ‘แƒ˜แƒขแƒ˜แƒก แƒ›แƒœแƒ˜แƒจแƒ•แƒœแƒ”แƒšแƒแƒ‘แƒ 128 64 32 16 8 4 2 1 1 1 1 1 1 1 1 1 = 256 1 แƒ‘แƒแƒ˜แƒขแƒ˜ = 8 แƒ‘แƒ˜แƒขแƒ˜ แƒ‘แƒ˜แƒขแƒ˜แƒก แƒ˜แƒœแƒ“แƒ”แƒฅแƒกแƒ˜ 7 6 5 4 3 2 1 0 แƒ‘แƒ˜แƒขแƒ˜แƒก แƒ›แƒœแƒ˜แƒจแƒ•แƒœแƒ”แƒšแƒแƒ‘แƒ 128 64 32 16 8 4 2 1 0 0 0 0 0 1 1 0 = ???
  • 10. แƒšแƒแƒ™แƒแƒšแƒฃแƒ แƒ˜ แƒ“แƒ แƒแƒ‘แƒ˜แƒ”แƒฅแƒขแƒ˜แƒก แƒชแƒ•แƒšแƒแƒ“แƒ”แƒ‘แƒ˜ โ€ข แƒšแƒแƒ™แƒแƒšแƒฃแƒ แƒ˜ - แƒ”แƒฌแƒแƒ“แƒ”แƒ‘แƒ แƒ›แƒ”แƒ—แƒแƒ“แƒ˜แƒก แƒจแƒ˜แƒ’แƒœแƒ˜แƒ— แƒแƒฆแƒฌแƒ”แƒ แƒ˜แƒš แƒœแƒ”แƒ‘แƒ˜แƒกแƒ›แƒ˜แƒ”แƒ  แƒชแƒ•แƒšแƒแƒ“แƒก. โ€ข แƒแƒ‘แƒ˜แƒ”แƒฅแƒขแƒ˜แƒก - แƒ”แƒฌแƒแƒ“แƒ”แƒ‘แƒ แƒ™แƒšแƒแƒกแƒ˜แƒก แƒชแƒ•แƒšแƒแƒ“แƒก แƒ แƒแƒ›แƒ”แƒšแƒ–แƒ” แƒฌแƒ•แƒ“แƒแƒ›แƒแƒช แƒจแƒ”แƒฃแƒซแƒšแƒ”แƒ‘แƒ”แƒšแƒ˜แƒ แƒ™แƒšแƒแƒกแƒ˜แƒก แƒแƒ‘แƒ˜แƒ”แƒฅแƒขแƒ˜แƒก แƒแƒ แƒกแƒ”แƒ‘แƒแƒ‘แƒ˜แƒก แƒ’แƒแƒ แƒ”แƒจแƒ”. โ€ข แƒšแƒแƒ™แƒแƒšแƒฃแƒ แƒ˜ แƒชแƒ•แƒšแƒแƒ“แƒ”แƒ‘แƒ˜ แƒงแƒแƒ•แƒ”แƒšแƒ—แƒ•แƒ˜แƒก แƒ˜แƒœแƒแƒฎแƒ”แƒ‘แƒ แƒกแƒขแƒ”แƒ™แƒจแƒ˜(Stack) โ€ข แƒแƒ‘แƒ˜แƒ”แƒฅแƒขแƒ˜แƒก แƒชแƒ•แƒšแƒแƒ“แƒ”แƒ‘แƒ˜ แƒงแƒแƒ•แƒ”แƒšแƒ—แƒ•แƒ˜แƒก แƒ˜แƒœแƒแƒฎแƒ”แƒ‘แƒ แƒ’แƒ แƒแƒ•แƒแƒจแƒ˜(Heap)
  • 11. Stack & Heap Heap Stack Variable 1 Object 1 Object 5 Variable 2 Variable 3 Object 3 Object 6 Object 4 Variable 4 Variable 5 Object 1
  • 12. แƒšแƒแƒ™แƒแƒšแƒฃแƒ แƒ˜ แƒ“แƒ แƒแƒ‘แƒ˜แƒ”แƒฅแƒขแƒ˜แƒก แƒชแƒ•แƒšแƒแƒ“แƒ”แƒ‘แƒ˜ แƒแƒ‘แƒ˜แƒ”แƒฅแƒขแƒ˜แƒก แƒชแƒ•แƒšแƒแƒ“แƒ”แƒ‘แƒ˜ public class TestClass { public String name; public int age; public String gender; } แƒšแƒแƒ™แƒแƒšแƒฃแƒ แƒ˜ แƒชแƒ•แƒšแƒแƒ“แƒ”แƒ‘แƒ˜ public static void main(String[] args) { String name = โ€œแƒ’แƒ˜แƒแƒ แƒ’แƒ˜โ€; int age = 22; String gender = โ€œmailโ€; //TestClass แƒแƒ‘แƒ˜แƒ”แƒฅแƒขแƒ˜แƒก แƒแƒฆแƒฌแƒ”แƒ แƒ TestClass test = new TestClass(); test.name = โ€œแƒกแƒแƒ‘แƒโ€ test.age = 18; test.name = โ€œmaleโ€ }
  • 13. แƒšแƒแƒ™แƒแƒšแƒฃแƒ แƒ˜ แƒ“แƒ แƒแƒ‘แƒ˜แƒ”แƒฅแƒขแƒ˜แƒก แƒชแƒ•แƒšแƒแƒ“แƒ”แƒ‘แƒ˜ แƒ›แƒ”แƒฎแƒกแƒ˜แƒ”แƒ แƒ”แƒ‘แƒแƒจแƒ˜ Heap Stack main แƒ›แƒ”แƒ—แƒแƒ“แƒ˜แƒก แƒšแƒแƒ™แƒแƒšแƒฃแƒ แƒ˜ แƒชแƒ•แƒšแƒแƒ“แƒ”แƒ‘แƒ˜ โ€œแƒ’แƒ˜แƒแƒ แƒ’แƒ˜โ€ name โ€œmaleโ€ TestClass แƒแƒ‘แƒ˜แƒ”แƒฅแƒขแƒ˜ age = 22 name = โ€œแƒกแƒแƒ‘แƒโ€ age = 18 gender name = test
  • 14. Stack & Heap Heap Stack
  • 15. The Simpsons } แƒกแƒ˜แƒ›แƒžแƒกแƒแƒœแƒ”แƒ‘แƒ˜แƒก แƒแƒฏแƒแƒฎแƒ˜แƒก แƒชแƒแƒšแƒ™แƒ”แƒฃแƒšแƒ˜ แƒฌแƒ”แƒ•แƒ แƒ˜ แƒจแƒ”แƒ’แƒ•แƒ˜แƒซแƒšแƒ˜แƒ แƒแƒฆแƒ•แƒฌแƒ”แƒ แƒแƒ— แƒจแƒ”แƒ›แƒ“แƒ”แƒ’แƒ˜ แƒ™แƒšแƒแƒกแƒ˜แƒ— public class Simpson { public String name; public int age; public String gender; }
  • 16. แƒแƒฎแƒšแƒ แƒฃแƒ™แƒ•แƒ” แƒจแƒ”แƒ’แƒ•แƒ˜แƒซแƒšแƒ˜แƒ แƒจแƒ”แƒ•แƒฅแƒ›แƒœแƒแƒ— แƒแƒฏแƒแƒฎแƒ˜แƒก แƒฌแƒ”แƒ•แƒ แƒ”แƒ‘แƒ˜ Java แƒแƒ‘แƒ˜แƒ”แƒฅแƒขแƒ”แƒ‘แƒ˜แƒก แƒกแƒแƒฎแƒ˜แƒ— public static void main(String[] args) { Simpson bart = new Simpson(); bart. name = โ€œBartโ€; bart. age = 12; bart. gender = โ€œmaleโ€; Simpson homer = new Simpson(); homer. name = โ€œHomerโ€; homer. age = 45; homer. gender = โ€œmaleโ€; }
  • 17. แƒกแƒ˜แƒ›แƒžแƒกแƒแƒœแƒ”แƒ‘แƒ˜แƒก แƒแƒฏแƒแƒฎแƒ˜แƒก แƒฌแƒ”แƒ•แƒ แƒ”แƒ‘แƒ˜ แƒ’แƒแƒ›แƒแƒงแƒแƒคแƒ˜แƒš แƒ›แƒ”แƒฎแƒกแƒ˜แƒ”แƒ แƒ”แƒ‘แƒแƒจแƒ˜ Heap Stack Simpson name = โ€œBartโ€ age = 12; gender = โ€œmaleโ€; bart Simpson homer name = โ€œHomerโ€ age = 45; gender = โ€œmaleโ€;