???(package)??????????,??????????????????????(library)??,?????????????????Java??????????????????????????(????? .class)???????????????????????????????????????,???????????????,?????????

1
???
2
? ? ? ?

• ?????
• ??????
• ??????
• ?????

3
????? (1/4)

• ???(package)??????????,??????????????????????(libr
  ary)??,?????????????????Java??????????????????????
  ????(????? .class)????????????????????????????????
  ???????,???????????????,?????????
• Java???????????????????????????,????????,?????????
  ???,?????????????????(.)???????java.awt???????????
  ?,????????????????????java????awt????(?java\awt???
  )?

4
????? (2/4)

• ?????????????????????????????????,????????????????
  ???,???????????????????,???????????????????????,??
  ????????????????
• ?????(package)???
• ????????????????
• ??????????????????
• ???????????????

5
????? (3/4)

• ????????????????????,??????????????????.zip(gnzip?
  ?)??????????.jar(Java Archive??)????,?????????????
  ??????????Java?????????????????.jar?Java
  Archive?????,?J2SDK?,??Java?????????j2sdk1.4.1_01\
  jre\lib\rt.jar???,?7-1???winzip???????rt.jar?????,
  ???rt.jar??????????Java???????????????????????

6
????? (4/4)
7
?????? (1/6)

• ????????????,?????????????????????????
• package????
• ?????????????????????????????????????????,????????
  ????????????????????????(??????)?????????,??,?????
  ???????????
• ????.???
• ??????,Java?????(??????)??????????????????????
  ?????

8
??????(2/6)

• ?????????????package???????????,????????????????,?
  ??????? .class????????????????????????????????,???
  ?????????
• ?? /javafile????????,???????????
• //?? ???.java
• //?? ????????????????
• package ????
• public class ???
• ????? /javafile??????????????,????????.java
  ?????,???????????????????????.class????????

9
??????(3/6)

• Java??????????????????????????????????,???????????
  ,???????????????????,????????????,?Java???????????
  ????????????,??????????????(?????\javafile????)???
  ????????CLASSPATH?,????????????????????????
• SET CLASSPATHCLASSPATH\javafile
• ??????java??????????? \javafile???????????????????
  ?????????????????autoexec.bat?,??????????????CLASS
  PATH????????????
• ??
• ??

10
??????(4/6)

• Java??????????????CLASSPATH????????????????,??,???
  ?,??javafile???????????????????????????.class,????
  ?. ?????????????Java??????????CLASSPATH???????????
  ????,?????????.jar?.zip????????,?????.jar?.zip????
  ????????????????,????????.jar?.zip???????????????J
  ava???????????

11
??????(5/6)

• Java??????????????????????.jar?Java
  Archive??,??????JDK???????jar??????????????,??
• jar cf ????.jar ???.class ???.class
• ???????????.class??????.class???????.jar????

12
??????(5/6)

• ????jar????????,?????????????jar??????jar?????????
  ??,??7-2???
• C\j2sdk1.4.1_01\bingtjar
• ???jar ctxuvfm0Mi jar-file manifest-file
  -C dir files ...
• ???
• -c ??????
• -t ???????
• -x ????????? (???) ??
• -u ???????
• -v ???????? verbose ??
• -f ??????
• -m ?????? manifest ???????
• -0 ??????? ZIP ?????
• -M ?????? manifest ??
• -i ???? jar ????????
• -C ???????????????
• ??????????????,?????????????
• ??????? 'm' ? 'f' ??????,
• ?? manifest ??????????

13
??????(6/6)

• ?????applet???,?????????????(bytecode),????????,??
  ????jar?????????????????jar??, ???????????,??
• jar cf ???.jar ???.class ???.class ??.jpg
  ??.wav
• ??????????.class????.class??????????.jpg????????.w
  av???????????.jar?,????HTML????
• ltAPPLET CODE"???.class"
• ARCHIVE"???.jar"
• WIDTH"150" HEIGHT"150"gt
• lt/APPLETgt
• ??????.class????.class???.jpg???.wav??????????????
  .jar????????,?????????,?????????????.class????????
  ??

14
?????? (1/3)

• ???????????????????????????
• ????????????????,??,???java.io.File ??? new
  java.io.File( )???????java.io????File????????,??
  new?????????????java.io????File????????
• ??import??????????????,??,???????????????import
  java.io.File????java.io????File????,??????????ja
  va.io?????????File?????java.io.File ??? new
  java.io.File( ) ????????????File ??? new
  File( )

15
?????? (2/3)

• ???,???import??????????()????????????,???import??
  ????????
• import????.???
• ????????????????????????
• import????.

16
?????? (3/3)

• ????????????????????????????import????????????????
  ?,??????????????????import??????????????????????
• ??

17
?????(1/7)

• Java??????????,Java???????????Java API(Java
  Applications Programming Interface),????Java
  API???????12???java.????????java.applet?java.awt?
  java.beans?java.io?java.lang?java.math?java.net?ja
  va.rmi?java.security?java.sql?java.text?java.util,
  ?7-1???????????12????????

18
?????(2/7)

• ??12??????java.lang????Java??????????,??????Java??
  ????????????????,?System?String?Object???,????????
  ??Java?????????????,?????????????????

19
?????(3/7)
20
?????(4/7)

• ??????12???java.????????,?????7-2???javax.swing?or
  g.omg.CORBA???
• ??

21
?????(5/7)

• Java??????????????????,???????????????????????????
  ???????????,??????????????????????,???????????http
  //java.sun.com??????API????,???????????,?????????
  ??????API????,??????????,????????API?????
• ?JDK??J2SDK1.4.1_01???API???????j2sdk-1_4_1-doc.zi
  p??,???????(Sun)??????????????????????????????Java
  ??API??????HTML?????,???????7-3???

22
?????(6/7)
23
?????(7/7)

• ????,java.lang????????Java???????????????,??Java??
  ??????????????????,?????????????,??????????java.la
  ng???????????,?String?Math?System?Double?Long?Char
  acter????
• ??

24
String?? (1/9)

• ??3???????String???,????????String???????,?????Str
  ing???????????

25
String?? (2/9)

• ???????????String???????????
• char ????1a,b,c
• String ??1new String(????1)
• char ????20,1,2,3,a,b,c,7,8
  
• String ??2new String(????2, 4, 3)
• byte ?????197,98,99 //??a????97,???
• String ??3new String(?????1)
• byte ?????248,49,50,51,97,98,99,55,56
  //??0????48,???
• String ??4new String(?????2,3,4)
• String ??5new String(??1)
• String ??6abc
• ??????????String???????1????6??????,????"abc"?

26
String?? (3/9)

• ??????String????????

27
String?? (4/9)
28
String?? (5/9)

• ???????????????String?????????
• ????(?? ????.java)
• //??????.java
• //??????String???????????
• class????
• public static void main(String ??)
• String ??1"?????,???????????,??????"
• System.out.println("??1??? "??1)
• System.out.println("??1??? "??1.length())
• int i0,j4

29
String?? (6/9)

• System.out.println("??1?????"i"???
  "??1.charAt(i))
• System.out.println("??1?????"j"???
  "??1.charAt(j))
• String ??2"abc",??3"abd",??4"ABC"
• System.out.println("??2???3?????
  "??2.compareTo(??3))
• System.out.println("??2???3????
  "??2.equals(??3))
• System.out.println("??2???4????(?????) "
  ??2.equalsIgnoreCase(??4))

30
String?? (7/9)

• System.out.println("??1??? ???? ??
  "??1.endsWith("????"))
• System.out.println("??1??? ?? ??
  "??1.startsWith("??"))
• System.out.println(" ?? ???1?????????? "
  ??1.indexOf("??"))
• System.out.println(" ?? ???1??????????? "
  ??1.lastIndexOf("??"))
• System.out.println("??1???? ? ????? ? ???\n
  " ??1.replace(?,?))
• System.out.println("??1?????6???????
  "??1.substring(6))

31
String?? (8/9)

• System.out.println("??1?????6???????11???????
  " ??1.substring(6,11))
• int ??1
• float ???2.0000f
• char ??3
• boolean ??false
• String ??5String.valueOf(??)
  String.valueOf(???) String.valueOf(??)
  String.valueOf(??)
• System.out.println(??5)
• //??main() ??????
• //?????? ??????

32
String?? (9/9)

• ????(??????java Run ????)

33
Math?? (1/7)

• ???Math?????

34
Math?? (2/7)
35
Math?? (3/7)
36
Math?? (4/7)

• ???????????????Math?????????
• ????(?? ??????.java)
• //?? ??????.java
• //??????Math?????????
• class ??????
• public static void main(String ??)
• double ??Math.random()2Math.PI
  //?????0?2???
• System.out.println("???? "??)
• System.out.println("??????
  "Math.toDegrees(??))
• System.out.println("sin("??")??
  "Math.sin(??))
• System.out.println("cos("??")??
  "Math.cos(??))
• System.out.println("tan("??")??
  "Math.tan(??))
• double ??Math.random()

37
Math?? (5/7)

1. System.out.println("???? "??)
2. System.out.println("asin("??")??
   "Math.asin(??))
3. System.out.println("acos("??")??
   "Math.acos(??))
4. System.out.println("atan("??")??
   "Math.atan(??))
5. ??Math.random()100
6. System.out.println("???? "??)
7. System.out.println("ceil("??")??
   "Math.ceil(??))
8. System.out.println("floor("??")??
   "Math.floor(??))
9. System.out.println("round("??")??
   "Math.round(??))
10. System.out.println("rint("??")??
    "Math.rint(??))

38
Math?? (6/7)

• System.out.println("log("??")??
  "Math.log(??))
• System.out.println("exp("??")??
  "Math.exp(??))
• System.out.println("sqrt("??")??
  "Math.sqrt(??))
• double ??Math.random()100
• double ??Math.random()100
• System.out.println("???? "??)
• System.out.println("???? "??)
• System.out.println("pow("??","??")??
  "Math.pow(??,??))
• //??main() ??????
• //?? ?????? ??????

39
Math?? (7/7)

• ????(??????java Run??????)

40
System?? (1/6)

• ???System?????

41
System?? (2/6)
42
System?? (3/6)

• ???????????????System?????????
• ????(?? ??System??.java)
• //?? ??System??.java
• //??????System?????????
• class ??System??
• public static void main(String ??)
• System.out.println(System.getProperties())
• System.out.println("java.class.path"
  System.getProperty("java.class.path"))

43
System?? (4/6)

1. System.setProperty("java.class.path","test")
2. System.out.println("java.class.path"
   System.getProperty("java.class.path"))
3. char ????10,1,2,3,4,5,6,7,
   8,9
4. char ????2new char20
5. System.out.println("????2?????"new
   String(????2))
6. System.out.println("??????? "System.
   currentTimeMillis())
7. System.arraycopy(????1,0,????2,5,10)
   //??????
8. System.out.println("??????? "System.
   currentTimeMillis())
9. System.out.println("????2?????"new
   String(????2))
10. //??main() ??????
11. //?? ??System?? ??????

44
System?? (5/6)

• ????(??????java Run ??System??)

45
System?? (6/6)

• ?5????? System.getProperties()?????????????????,?
  ??7-3??????????????????????????

46

• ?????????Java?????????? byte?short?char?int?long?f
  loat?double?boolean????????void?????????????,?????
  ????????(wrapper class)???????Java????????????????
  ?,??????Java????????

47
Double?Float?? (1/9)

• Double???double???????,?Float???float??????????Dou
  ble???Float?????????,?????????Double?????????,
  Float???????????Java???API?????

48
Double?Float?? (2/9)

• ???Double???????

49
Double?Float?? (3/9)

• ???Double?????????

50
Double?Float?? (4/9)

• ???Double????????

51
Double?Float?? (5/9)
52
Double?Float?? (6/9)

• Float???Double?????????,????,?????Double????????Do
  uble??Float,??double??float??Float?????????????,Do
  uble???????
• static double parseDouble(String ??)
• ??????????????double????,??????Double?Float??,??do
  uble?float?????????
• static float parseFloat(String ??)
• ?????Float???????,???????????float?????

53
Double?Float?? (7/9)

• ????????????Double?????????
• ????(?? ??Double??.java)
• //?? ??Double??.java
• //??????Double?????????
• class ??Double??
• public static void main(String ??)
• double ??11.0/0.0
• double ??2-1.0/0.0
• double ??30.0/0.0

54
Double?Float?? (8/9)

1. Double ??1new Double(1.2345)
2. Double ??2new Double("12345E-4")
3. Double ??3new Double("1.2222")
4. System.out.println("??1"??1",??2"??2",??
   3"??3)
5. System.out.println("?????1???2???3??????")
6. System.out.println(Double.isInfinite(??1)"
   " Double.isInfinite(??2)"
   " Double.isInfinite(??3))
   
7. System.out.println("?????1???2???3??????")
8. System.out.println(Double.isNaN(??1)" "
   Double.isNaN (??2)" "
   Double.isNaN (??3))
9. System.out.println(??1""??2"?"??1.equals(?
   ?2))
10. System.out.println(??1"?"??2"??"??1.compare
    To(??2))
11. System.out.println(??1"?"??3"??"??1.compare
    To(??3))
12. //??main() ??????
13. //?? ??Double?? ??????

55
Double?Float?? (9/9)

• ????(??????java Run ??Double??)

56
Byte?Short?Integer?Long?? (1/8)

• Byte???byte???????,Short???short???????,Integer???
  integer????????Long???long???????,?????????????,??
  ,???????Long?????????,????????????Java???API?????

57
Byte?Short?Integer?Long?? (2/8)

• ???Long???????

58
Byte?Short?Integer?Long?? (3/8)

• ???Long?????????

59
Byte?Short?Integer?Long?? (4/8)

• ???Long????????

60
Byte?Short?Integer?Long?? (5/8)
61
Byte?Short?Integer?Long?? (6/8)

• ???????Long?????????????
• ????(?? ????.java)
• //??????.java
• //??????Long????????????
• import javax.swing.JOptionPane
  //??JOptionPane??
• class????
• public static void main(String ??)
• String ??1JOptionPane.showInputDialog("??????
  ????")
• String ??2JOptionPane.showInputDialog("??????
  ????")

62
Byte?Short?Integer?Long?? (7/8)

• long ??Long.parseLong(??1)
• int ??Integer.parseInt(??2)
• String ????"??????? "??"\n"
  "???"??"??? "
  Long.toString(??, ??)
• JOptionPane.showMessageDialog(null,????)
• System.exit(0)
• //??main() ??????
• //?????? ??????

63
Byte?Short?Integer?Long?? (8/8)

• ????(??????java Run????)

64
Character?? (1/8)

• Character???char???????,??????Character??????????
• ???Character???????

65
Character?? (2/8)

• ???Character?????????

66
Character?? (3/8)

• ???Character????????

67
Character?? (4/8)
68
Character?? (5/8)

• ????????????Character?????????
• ????(?? ??Character??.java)
• //????Character??.java
• //??????Character?????????
• import javax.swing.JOptionPane
  //??JOptionPane??
• class ??Character??
• public static void main(String ??)
• String ??1JOptionPane.showInputDialog("??????
  ??????")
• char ????1.charAt(0)

69
Character?? (6/8)

1. String ????"?????? "??"\n"
2. ????("\n???? "Character.isUpperCase(??))
3. ????("\n???? "Character.isLowerCase(??))
4. ????("\n???? "Character.isLetter(??))
5. ????("\n???? "Character.isDigit(??))
6. ????("\n?????? "Character.isWhitespace(??)
   )
7. ????("\n?????? "Character.isLetterOrDigit(
   ??))
8. ????("\n????????? "
9. Character. isJavaIdentifierStart(??))

70
Character?? (7/8)

1. ????("\n???? "Character.toUpperCase(??))
2. ????("\n???? "Character.toLowerCase(??))
3. ????("\n??Unicode??? "Character.getNumericValu
   e(??))
4. JOptionPane.showMessageDialog(null,????)
5. System.exit(0)
6. //??main() ??????
7. //????Character?? ??????

71
Character?? (8/8)

• ????(??????java Run ??Character??)

72

• QA

73
????????????

• ????????????????????????????????????????????????
  ???????????????????????????????????????????package
  (???)?????friendly(??)?????

74
??

• ????????,??CLASSPATH?????????????????,???(??)??
  ??????????,??,SET CLASSPATHCLASSPATH\??1.\?
  ?1\sub???????CLASSPATH???????\??1?????(?.??)?\??1
  \sub?????????????????

75
??

• ?Unix?????,??CLASSPATH????????????????,???(??)??
  ?????????????,setenv CLASSPATH
  CLASSPATH/??1./??1/sub

76
??

• ?????import?????????,??,?????????????????????????,
  ???????????????????????????????????

77
??

• CORBA (Common Object Reguest Broker
  Architecture)?RMI (Remote Method
  Invocation)??????,????????RMI?????Java?????,?CORBA
  ??????????????(????????Java???????)?

78
??

• java.lang??????????Boolean ?Byte ?Character
  ?Character.Subset ?Character.UnicodeBlock ?Class
  ?ClassLoader ?Compiler ?Double ?Float
  ?InheritableThreadLocal ?Integer ?Long ?Math
  ?Number ?Object ?Package ?Process ?Runtime
  ?RuntimePermission ?SecurityManager ?Short
  ?String ?StringBuffer ?System ?Thread
  ?ThreadGroup ?ThreadLocal ?Throwable ?Void?