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+BWB
8IP`T8IPJO
+BWBJOUIF#PY
ᓎఉ༞Ұ
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8IP`T8IP ͍ΘΏΔਈ࢜
+BWB ͕ੜ·Εͯ
ͦͷྺ࢙ͷதͰ +BWB Λ࡞͖ͬͯͨ
ͦͯ͠ɺݱࡏ +BWB Λ࡞͍ͬͯΔ
ਓʑΛհ͍͖ͯ͠·͢
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1BTU
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+BNFT(PTMJOH
+BWB ͷ
(PTMJOH&NBDT
/F84 ͷ࡞ऀ
ਖ਼ 54IJSU+FBOT
+BWB0OF54IJSU5PTT
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+BNFT(PTMJOH
+BWB ͷ
(PTMJOH&NBDT
/F84 ͷ࡞ऀ
ਖ਼ 54IJSU+FBOT
+BWB0OF54IJSU5PTT
$PNQVUFS)JTUPSZ
.FTFVN఼ಊೖΓ
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#JMM+PZ
ॳظͷ +BWB ͷਪਐऀ
WJ
DTI
#4%5$1*1ελοΫ
ͳͲͷ࡞ऀ
$PNQVUFS)JTUPSZ
.FTFVN఼ಊೖΓ
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+PTIVB#MPDI
ඪ४ϥΠϒϥϦͷ࡞
ίϨΫγϣϯϑϨʔϜϫʔΫͳͲ
&GGFDUJWF+BWB ஶऀ
/FBM(BGUFS ͱͷίϯϏͰ
+BWB1V[[MFST
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+BWB1V[[MFST
حົͳ;Δ·͍Λ͢ΔϓϩάϥϜ
બࢶͷத͔ΒͲΕ͕දࣔ͞ΕΔ͔
ղͱղઆ
ڭ܇
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&MWJT-JWFT
public class Elvis {
public static final Elvis INSTANCE = new Elvis();
private final int beltSize;
private static final int CURRENT_YEAR = Year.now().getValue();
private Elvis () { beltSize = CURRENT_YEAR - 1930; }
public int beltSize() { return beltSize; }
public static void main(String... args) {
System.out.println("Elvis wears size "
+ INSTANCE.beltSize() + " belt.");
}
}
1) Elvis wears size 0 belt.
2) Elvis wears size -1930 belt.
3) Elvis wears size 93 belt.
4) Null Pointer Exception
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&MWJT-JWFT
public class Elvis {
public static final Elvis INSTANCE = new Elvis();
private final int beltSize;
private static final int CURRENT_YEAR = Year.now().getValue();
private Elvis () { beltSize = CURRENT_YEAR - 1930; }
public int beltSize() { return beltSize; }
public static void main(String... args) {
System.out.println("Elvis wears size "
+ INSTANCE.beltSize() + " belt.");
}
}
1) Elvis wears size 0 belt.
2) Elvis wears size -1930 belt.
3) Elvis wears size 93 belt.
4) Null Pointer Exception
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4DPUU.D/FBMZ
4VO.JDSPTZTUFNT ۀऀ
ޱѱ͍͕ɺѪ͞ΕΔܦӦऀ
4DPUU`T5PQ
+PIO(BHF
5IF/FUXPSLJT5IF$PNQVUFS
ఏএऀ
+BWB0OF ͷ .$ Λ͘ΊΔ
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1SFTFOU
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.BSL3FJOIPME
+BWB$IJFG"SDIJUFDU
/*04QFD-FBE +BWB
+BWB4QFD-FBE +BWB
+BWB ։ൃऀ͔Βͷઈେͳ৴པ
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#SJBO(PFU[
+BWB-BOHVBHF"SDIJUFDU
+BWB4QFD-FBE +BWB
+BWB ฒߦॲཧϓϩάϥϛϯάஶऀ
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#SJBO(PFU[
+BWB-BOHVBHF"SDIJUFDU
+BWB4QFD-FBE +BWB
+BWB ฒߦॲཧϓϩάϥϛϯάஶऀ
ଞʹهࣄ+&1 ͳͲଟ
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+PIO3PTF
+7.4FOJPS"SDIJUFDU
+7. ͷ
ࢣঊͱู͏։ൃऀଟ͍
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1BVM4BOEP[
.BVSJ[JP$JNBEBNPSF
3PO1SFTTMFS
4UVBSU.BSLT
1SPKFDU1BOBNB
1SPKFDU1BOBNB ''.
7JSUVBM5ISFBE
$PSF-JC
%S%FQSFDBUFE
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(FPSHFT4BBC $IBE"SJNVSB 4IBSBU$IBOEFS
4FOJPS71PG
+BWB1MBUGPSN(SPVQ
ݩ"85 ։ൃऀ
71PG+BWB%FW3FM
'O1SPKFDU
4FOJPS%JSFDUPSPG
+BWB1SPEVDU.OH
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%VLF
+BWB0GpDJBM.BTDPU
࣮+BWB ΑΓݹࢀ
ݩʑͷ໊લ'BOH
ϥΠηϯε #4%
%VLF`T$IPJDF"XBSE
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$PODMVTJPO
୭͕࡞͍ͬͯΔ͔ΛΕɺ͠ΈΘ͘
Ұ࣍ใΛॏࢹ͠Α͏
ࠓհͨ͠։ൃऀ͔ͨͪΒͷใ৴པʹ͢Δ
ػೳͷ͍ํΑΓɺͦͷػೳͷಋೖഎܠֶΛཧղ͢Δ
$PNNVOJUZ ʹ *OWPMWF ͠Α͏
ࢀՃ͢Δ͚ͩͰҙٛ͋Δ