Fundamental Java

Transcript

1. Fundamental Java HASUNUMA Kenji Vice president, GlassFish Users Group Japan k.hasunuma@coppermine.jp Twitter: @btnrouge
2. What’s Java?
3. Javaͷಛ௃ • Φʔϓϯͳن֨Ͱ͋Δ • ৗʹਐԽ͍ͯ͠Δ • ޓ׵ੑΛॏࢹ͍ͯ͠Δ
4. Java͸Φʔϓϯن֨ • ݴޠɺඪ४APIɺԾ૝Ϛγϯ࢓༷ • Java Community ProcessͰඪ४Խ • ݱࡏ͸Φʔϓϯιʔε (GPLv2)
5. wWrite Once, Run Anywhere
   wݴޠϨϕϧͰϚϧνεϨουରԠ
   wݫ֨ͳྫ֎ॲཧػߏ
   w6OJDPEFΛશ໘తʹ࠾༻
6. Write Once, Run Anywhere • OSɺJava VM࣮૷ʹґଘ͠ͳ͍ • ݹ͍ίʔυ͕࠷৽ͷJavaͰ΋ಈ͘ • Blu-ray͔ΒڊେγεςϜ·Ͱ
7. 
   
   
   
   
   
   
   
    
      ౰ॳ
   04ͷࠩҟΛ+BWB
   7.͕ٵऩ͢Δ ݱࡏ
   +BWB
   7.͕ଟݴޠͷڞ௨ج൫΁
8. Essential Java
9. 
   
   
             
      JavaͷΤίγεςϜ
10.              ΫϥεͱΠϯλϑΣʔε
11.        !          ! Ϋϥεͷܧঝ
12.         " # " Polymorphismͱ͸
13.      $%&  '&( ( )&%%%  ϓϩηεͱεϨου
14.      $%&  '&( ( )&%%%    $%*   $%*   $%* + + ϓϩηεͱεϨου
15.           , "- # ./0 , 0  #- ./0      "  "   "  "   "  " -""1 +BWBͷೖग़ྗ 4USFBN ݱࡏͰ͸จࣈྻσʔλʹಛԽͨ͠3FBEFS8SJUFS΍ɺ ߴ଎*0Λ࣮ݱ͢Δ$IBOOFM΋Α͘࢖ΘΕ͍ͯΔ
16. +BWBͷύοέʔδ
       
    
                  
       
        
    
    
17. Ϋϥε໊ͷදهํ๏
    wݪଇ
    ύοέʔδΛؚΉ׬શ໊
 ྫ
    java.util.List
    wimportએݴ
    ಛఆͷύοέʔδΛলུՄ
 ํ๏
    import java.util.List;
 ํ๏
    import java.util.*;
    wjava.langʜৗʹύοέʔδΛলུՄ
18. +BWBΫϥεͷಉҰੑ
    • Ϋϥε໊͕ಉҰͰ͋Δ • ύοέʔδ໊͕׬શʹҰக͍ͯ͠Δ • ಉ͡Ϋϥεϩʔμʔ͔ΒಡΈࠐ·Εͨ
19. Java Core Parts
20. ΫϥεͱΦϒδΣΫτ
    • Ϋϥε͸ఆٛͷΈ…࣮ମ͕ͳ͍ • ΦϒδΣΫτ(Πϯελϯε)
 …Ϋϥε͔Β࡞੒࣮ͨ͠ମͷ͜ͱ • ϑΟʔϧυͱϝιου͸ΦϒδΣΫτʹ ଐ͢Δ(㱻static͸Ϋϥεʹଐ͢Δ)
21. java.lang.Object • JavaͷશΫϥεͷεʔύʔΫϥε • ΫϥεͷࠜװʹؔΘΔϝιουΛ࣋ͭ • ϓϦϛςΟϒܕʹରͯ͠ϦϑΝϨϯεܕ ͱݺ͹ΕΔ͜ͱ΋͋Δ
22. java.lang.Object ͷϝιου equals ಉҰνΣοΫʹ࢖͏ ※ݪଇͱͯ͠ΦʔόʔϥΠυ͢Δ hashCode toString จࣈྻදݱΛฦ͢ ※༻్͸༷ʑ wait εϨου੍ޚ༻ϝιου ※௨ৗ͸Concurrency UtilitiesΛܦ༝ ͯ͠࢖༻͢Δ(ΦʔόʔϥΠυෆՄ) notify notifyAll clone ίϐʔ(࠷ۙ͸࢖ΘΕͳ͍) finalize ޙॲཧ(௨ৗ͸ΦʔόʔϥΠυ͠ͳ͍)
23. Object o = new Object();
24. Object o = new Object();
25. Object o = new Object(); ӈลͱಉ͡Ϋϥε
    PS
    εʔύʔΫϥε
    PS
    ࣮૷ΠϯλϑΣʔε
26. Object o = new ArrayList();
27. Ωϟετ
    Object o = new ArrayList(); • objͷఆٛ͸Objectɺ࣮ମ͸ArrayList • ΞΫηε͸ఆٛΛ௨ͯ͡ߦ͏ • ࣮ମ΁ͷ௚઀ΞΫηεˠΩϟετ ArrayList list = (ArrayList) o; w Ωϟετ=αϒΫϥεͷఆٛͰΞΫηε w Ωϟετޙ͸࣮ମʹ௚઀ΞΫηεՄೳ
28. ϓϦϛςΟϒܕ
    • ΫϥεͰ͸ͳ͍σʔλܕ • ରԠ͢ΔΫϥε(ϥούʔ)Λ࣋ͭ • auto-boxing/unboxing:
 ϓϦϛςΟϒܕͱϥούʔͷ૬ޓม׵
29. ϓϦϛςΟϒܕ ϥούʔΫϥε boolean Boolean byte Byte char Character short Short int Integer long Long float Float double Double
30. ഑ྻ
    • ಉ͡ΫϥεorϓϦϛςΟϒܕͷ࿈ଓ • ԋࢉࢠ [ ] ͰཁૉʹΞΫηε͢Δ • ಺෦తʹ͸java.lang.ArrayΫϥε
31. Object[ ] o = new Object[8]; P
    ͸
    0CKFDUͷ഑ྻ
    ཁૉ਺͸ࢦఆ͠ͳ͍ ഑ྻͷཁૉ਺͸
    
    ඞͣఆ਺ޙͰมߋෆՄ ഑ྻͷ৔߹ɺࠨลͱӈล͸ಉ͡Ϋϥε
32. ͦͷଞͷॏཁͳτϐοΫ • Generics (J2SE 5.0) • Annotation (J2SE 5.0) • Project Coin (Java SE 7) • Collections Framework (J2SE 1.2) • New I/O (J2SE 1.4 & Java SE 7) • Concurrency Utilitites (J2SE 5.0 & Java SE 7)
33. Fundamental Java HASUNUMA Kenji k.hasunuma@coppermine.jp Twitter: @btnrouge