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????????(Java)

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Title: ????????(Java)


1
????????(Java)
2
????
  • ????????
  • ???????
  • ????????
  • ????
  • (1)??20,???/?????
  • (2)???? 20
  • (3)????30,4??????
  • (4)??????,30

3
??Java??
  • ????
  • Java????
  • Java???????????????
  • Java???????
  • Java???????????????
  • Java???????????

4
????
  • ??Java??????????????C/C?????Java
    ??????????,???????
  • ??Java?????????Java??????????
  • ??????Java???????
  • ??????????????Java???

5
?????
  • ??
  • ??Java???????????
  • ??
  • 1)?Java???????????????
  • 2)?Java??????????????

6
???Java??
  • Java?????
  • ?????
  • ?????

7
???????
  • ???

    ???


  • ???

  • ???

  • ? ?
  • ??????????


  • ???????????




  • ??

????
011001 010001 111110
?????? (???????)
8
??????
  • ??? ???


  • ??
  • ???
    ??? ???
  • ???????????????,
  • ???????????????

?????? (?????)
9
Java??????
  • Programmer
    Source code (.java file)



  • Compiler

  • yes no

  • Source code becomes
    generic

  • executable bytecode
    file (.class file)


  • User
  • JVM
    JVM JVM
  • Operating system-specific JVM reads .class
    file,runs security check,interprets and
    compiles,then runs program.

Checks for errors
bytecode
User starts the program (bytecode .class file)
10
Java????????
11
????
  • ???(JVM)
  • ?Java?????,??Java?????????CPU?Java????????????Jav
    a???? Java????Java
  • ????????,?Java??????,???????,??????????
  • ???(bytecode)
  • Java??????????? ,?Java???????,?
  • ??????????,?????????Java?????,?????????????Java??
    ?

12
Java ???????
  • Java ???(JVM)
  • Java ?????(JRE)
  • ????????(API)
  • Java 2,Java 2 Platform,J2 SDK(Software
    Developers Kit) ????

J2 SDK
JRE
JVM
13
Java?????????
14
Java????
  • ???Java????
  • Sun ???JSDK(???????)
  • ??http//java.sun.com/products
  • Borland/Inprise???Jbuilder
  • IBM Visual Age for Java
  • Symantec Visual Café.

15
Java??????
  • Java???????????(??)
  • J2EE- Java 2 Enterprise Edition
  • J2SE- Java 2 Standard Edition
  • J2ME- Java 2 Micro Edition

16
Java??????????
  • win2000?????,??JSDK?
  • c \j2sdk1.4.1_03,????????path(2???)
  • 1)????gt??gt????
  • ????path,?????jsdk???
  • c\j2sdk1.4.1_03\bin
  • 2)?dos?????????path
  • set pathc\j2sdk1.4.1_03\binpath
  • ???????? set path?

17
Java????????
  • 1 ????? (filename.java)
  • 2 ?????(javac.exe)????????,???????(.class)
  • ????javac filename.java
  • 3 ?????(java.exe)??????????
  • ????java filename

18
??Java???
  • ??????????????
  • ?Java APIS????????

19
SDKJRETOOLS
20
Java??????(API)
  • Java???????(API)????,????Sun????,????????????
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