Who's Who in Java

2023.08.26 むきむきJava 発表資料

Transcript

1. +BWB
   8IP`T8IPJO
   +BWBJOUIF#PY
   ᓎఉ༞Ұ
   

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2. 8IP`T8IP ͍ΘΏΔਈ࢜࿥
   +BWB ͕ੜ·Εͯ ೥
   ͦͷྺ࢙ͷதͰ +BWB Λ࡞͖ͬͯͨ
   ͦͯ͠ɺݱࡏ +BWB Λ࡞͍ͬͯΔ
   ਓʑΛ঺հ͍͖ͯ͠·͢
   

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3. 1BTU
   

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5. +BNFT(PTMJOH
   +BWB ͷ෕
   (PTMJOH&NBDT
   /F84 ͷ࡞ऀ
   ਖ਼૷ 54IJSU+FBOT
   +BWB0OF54IJSU5PTT
   

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7. +BNFT(PTMJOH
   +BWB ͷ෕
   (PTMJOH&NBDT
   /F84 ͷ࡞ऀ
   ਖ਼૷ 54IJSU+FBOT
   +BWB0OF54IJSU5PTT
   $PNQVUFS)JTUPSZ
   .FTFVN఼ಊೖΓ
   

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10. #JMM+PZ
    ॳظͷ +BWB ͷਪਐऀ
    WJ DTI
    #4%5$1*1ελοΫ
    ͳͲͷ࡞ऀ
    $PNQVUFS)JTUPSZ
    .FTFVN఼ಊೖΓ
    

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12. +PTIVB#MPDI
    ඪ४ϥΠϒϥϦͷ࡞੒
    ίϨΫγϣϯϑϨʔϜϫʔΫͳͲ
    &GGFDUJWF+BWB ஶऀ
    /FBM(BGUFS ͱͷίϯϏͰ
    +BWB1V[[MFST
    

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13. +BWB1V[[MFST
    حົͳ;Δ·͍Λ͢ΔϓϩάϥϜ
    બ୒ࢶͷத͔ΒͲΕ͕දࣔ͞ΕΔ͔
    ղ౴ͱղઆ
    ڭ܇
    

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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
    

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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
    

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16. 4DPUU.D/FBMZ
    4VO.JDSPTZTUFNT ૑ۀऀ
    ޱ͸ѱ͍͕ɺѪ͞ΕΔܦӦऀ
    4DPUU`T5PQ
    +PIO(BHF
    5IF/FUXPSLJT5IF$PNQVUFS
    ఏএऀ
    +BWB0OF ͷ .$ Λ௕͘຿ΊΔ
    

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17. 1SFTFOU
    

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19. .BSL3FJOIPME
    +BWB$IJFG"SDIJUFDU
    /*04QFD-FBE +BWB
    
    +BWB4QFD-FBE +BWB
    
    +BWB ։ൃऀ͔Βͷઈେͳ৴པ
    

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21. #SJBO(PFU[
    +BWB-BOHVBHF"SDIJUFDU
    +BWB4QFD-FBE +BWB
    
    +BWB ฒߦॲཧϓϩάϥϛϯάஶऀ
    

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22. #SJBO(PFU[
    +BWB-BOHVBHF"SDIJUFDU
    +BWB4QFD-FBE +BWB
    
    +BWB ฒߦॲཧϓϩάϥϛϯάஶऀ
    ଞʹ΋هࣄ΍+&1 ͳͲଟ਺
    

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24. +PIO3PTF
    +7.4FOJPS"SDIJUFDU
    +7. ͷ਌෼
    ࢣঊͱู͏։ൃऀ΋ଟ͍
    

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25. 1BVM4BOEP[
    .BVSJ[JP$JNBEBNPSF
    3PO1SFTTMFS
    4UVBSU.BSLT
    1SPKFDU1BOBNB
    1SPKFDU1BOBNB ''.
    
    7JSUVBM5ISFBE
    $PSF-JC
    %S%FQSFDBUFE
    

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26. (FPSHFT4BBC $IBE"SJNVSB 4IBSBU$IBOEFS
    4FOJPS71PG
    +BWB1MBUGPSN(SPVQ
    ݩ"85 ։ൃऀ
    71PG+BWB%FW3FM
    'O1SPKFDU
    4FOJPS%JSFDUPSPG
    +BWB1SPEVDU.OH
    

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28. %VLF
    +BWB0GpDJBM.BTDPU
    ࣮͸+BWB ΑΓ΋ݹࢀ
    ݩʑͷ໊લ͸'BOH
    ϥΠηϯε #4%
    %VLF`T$IPJDF"XBSE
    

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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
    

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