Who's Who in Java

2023.08.26 むきむきJava 発表資料

Transcript

1. +BWB 8IP`T
   8IP
   
   JO +BWB
   JO
   UIF
   #PY ᓎఉ
   ༞Ұ
2. 8IP`T
   8IP ͍ΘΏΔਈ࢜࿥ +BWB ͕ੜ·Εͯ  ೥ ͦͷྺ࢙ͷதͰ +BWB Λ࡞͖ͬͯͨ ͦͯ͠ɺݱࡏ +BWB Λ࡞͍ͬͯΔ ਓʑΛ঺հ͍͖ͯ͠·͢
3. 1BTU
5. +BNFT
   (PTMJOH +BWB ͷ෕ (PTMJOH
   &NBDT /F84 ͷ࡞ऀ ਖ਼૷ 
   5
   4IJSU
   
   +FBOT +BWB0OF
   5
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   5PTT
7. +BNFT
   (PTMJOH +BWB ͷ෕ (PTMJOH
   &NBDT /F84 ͷ࡞ऀ ਖ਼૷ 
   5
   4IJSU
   
   +FBOT +BWB0OF
   5
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   5PTT $PNQVUFS
   )JTUPSZ .FTFVN
   ఼ಊೖΓ
10. #JMM
    +PZ ॳظͷ +BWB ͷਪਐऀ WJ
    DTI #4%
    5$1*1
    ελοΫ
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    ͳͲͷ࡞ऀ $PNQVUFS
    )JTUPSZ .FTFVN
    ఼ಊೖΓ
12. +PTIVB
    #MPDI ඪ४ϥΠϒϥϦͷ࡞੒
    
    ίϨΫγϣϯϑϨʔϜϫʔΫͳͲ &GGFDUJWF
    +BWB ஶऀ /FBM
    (BGUFS ͱͷίϯϏͰ +BWB
    1V[[MFST
13. +BWB
    1V[[MFST حົͳ;Δ·͍Λ͢ΔϓϩάϥϜ બ୒ࢶͷத͔ΒͲΕ͕දࣔ͞ΕΔ͔ ղ౴ͱղઆ ڭ܇
14. &MWJT
    -JWFT public class Elvis { public static final Elvis INSTANCE = new Elvis(); private final int beltSize; private static final int CURRENT_YEAR = Year.now().getValue(); private Elvis () { beltSize = CURRENT_YEAR - 1930; } public int beltSize() { return beltSize; } public static void main(String... args) { System.out.println("Elvis wears size " + INSTANCE.beltSize() + " belt."); } } 1) Elvis wears size 0 belt. 2) Elvis wears size -1930 belt. 3) Elvis wears size 93 belt. 4) Null Pointer Exception
15. &MWJT
    -JWFT public class Elvis { public static final Elvis INSTANCE = new Elvis(); private final int beltSize; private static final int CURRENT_YEAR = Year.now().getValue(); private Elvis () { beltSize = CURRENT_YEAR - 1930; } public int beltSize() { return beltSize; } public static void main(String... args) { System.out.println("Elvis wears size " + INSTANCE.beltSize() + " belt."); } } 1) Elvis wears size 0 belt. 2) Elvis wears size -1930 belt. 3) Elvis wears size 93 belt. 4) Null Pointer Exception
16. 4DPUU
    .D/FBMZ 4VO
    .JDSPTZTUFNT ૑ۀऀ ޱ͸ѱ͍͕ɺѪ͞ΕΔܦӦऀ 4DPUU`T
    5PQ
     +PIO
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    ఏএऀ +BWB0OF ͷ .$ Λ௕͘຿ΊΔ
17. 1SFTFOU
19. .BSL
    3FJOIPME +BWB
    $IJFG
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    -FBE
    +BWB
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    +BWB
     +BWB ։ൃऀ͔Βͷઈେͳ৴པ
21. #SJBO
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    +BWB ฒߦॲཧϓϩάϥϛϯά
    ஶऀ
22. #SJBO
    (PFU[ +BWB
    -BOHVBHF
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    4QFD
    -FBE
    +BWB
    
    +BWB ฒߦॲཧϓϩάϥϛϯά
    ஶऀ ଞʹ΋هࣄ΍+&1 ͳͲଟ਺
24. +PIO
    3PTF +7.
    4FOJPS
    "SDIJUFDU +7. ͷ਌෼ ࢣঊͱู͏։ൃऀ΋ଟ͍
25. 1BVM
    4BOEP[ .BVSJ[JP
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26. (FPSHFT
    4BBC $IBE
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28. %VLF +BWB
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    .BTDPU ࣮͸+BWB ΑΓ΋ݹࢀ ݩʑͷ໊લ͸'BOH ϥΠηϯε #4% %VLF`T
    $IPJDF
    "XBSE
30. $PODMVTJPO ୭͕࡞͍ͬͯΔ͔Λ஌Ε͹ɺ਌͠Έ΋Θ͘ Ұ࣍৘ใΛॏࢹ͠Α͏ ࠓ೔঺հͨ͠։ൃऀ͔ͨͪΒͷ৘ใ͸৴པʹ஋͢Δ ػೳͷ࢖͍ํΑΓ΋ɺͦͷػೳͷಋೖഎܠ΍఩ֶΛཧղ͢Δ $PNNVOJUZ ʹ *OWPMWF ͠Α͏ ࢀՃ͢Δ͚ͩͰ΋ҙٛ͸͋Δ