J2ME

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J2ME

• ??
• 8942004 ???
• 8942031 ???
• 8942034 ???

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?.??JAVA????????

• ??Java?Write once,run anywhere??,????????????
  ???,????
• ????????(??????????????????
• ??Java Virtual Machine ??)?

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?.J2ME???

• J2ME??????Java????????,???Java?
  PC?????????J2ME?Sun Microsystems??????????????????
  ??????J2ME??Java "write once run
  everywhere"???,??????????????????????????

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• J2ME???,??

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• ?????????,J2ME??????????Virtual
  Machine???????????,??Virtual Machine??KVM,??J2ME??
  ??Libraries??????????????????????????????????,????
  "write once run everywhere"???,??????????,????????
  ????????J2ME????????????????,?????Connected
  Limited Device Configuration(CLDC),?Sun???????????
  ???Nokia? Motorola?

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• ?????, NTT DoCoMo?3G??FOMA???????J2ME????J2ME?
  ?????????????????,????????"?"?????(??????????,????
  ????????,????????????????????????)????????????????
  Java??,????J2ME??????????????????

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?.CDC CLDC

• a.CLDC?????????????????,???PALM???PDA???????????
• b.CDC??????????????????????????????

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?.?????

• a. J2ME WIRELESS TOOLKIT
• (sun)
• b. CODEWARRIOR FOR JAVA
• (MOTOROLA A6288??)
• c.JBUILDER MOBILESET

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?.MIDlet

• 1.MIDlet?????
• a.??????????Java MIDlet???? ?javax.microedition
  .midlet.MIDlet???.
• b. javax.microedition.midlet.MIDlet?????
  ???????,?????
• startApp() ? ?????
• pauseApp() ? ?????
• destoryApp() ? ?????

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• ??MIDlet??????????,????Java MIDlet??????????

Import javax.microedition.midlet. Public class HellowMIDlet extends MIDlet public HellowMIDlet() //??? public void startApp() public void pauseApp() public void destoryApp(boolean unconditional)
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• ??!!!
• ??MIDP??,MIDlet?????
• Public static void main(string args)
• ????,?????,Java application
• Manager (jam),??????

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• 2.MIDlet?????
• ?MIDlet????????,????????????MIDlet????????Java
  application Manager ??,?????MIDlet???????????????,
  Java application Manager ????????,???????????,??JA
  M???MIDletStaticChangeException???

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• 3.MIDlet ?????
• a.MIDP?,???????????????????
• (1)?????? ? ??????????
• (2)?????? ? ?????????
  ??LCD????????????? ??
• (3)?????? ? Canvas???paint()?
  ?????????????,??? ??Graphic??????
• (4)??Display???callSerially()????
  ????Runnable??????run()? ?????

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• b. ?????????????? ??????????????
  ??????,??????? ??????????????, ?????????????
• note
• ??????????????,???? ??MIDlet??????????????
  ??????,???????????? ????????,?????????? ????