Fundamental Java - Speaker Deck

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Fundamental Java HASUNUMA Kenji Vice president, GlassFish Users Group Japan k.hasunuma@coppermine.jp Twitter: @btnrouge

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What’s Java?

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Javaͷಛ௃ • Φʔϓϯͳن֨Ͱ͋Δ • ৗʹਐԽ͍ͯ͠Δ • ޓ׵ੑΛॏࢹ͍ͯ͠Δ

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Java͸Φʔϓϯن֨ • ݴޠɺඪ४APIɺԾ૝Ϛγϯ࢓༷ • Java Community ProcessͰඪ४Խ • ݱࡏ͸Φʔϓϯιʔε (GPLv2)

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wWrite Once, Run Anywhere wݴޠϨϕϧͰϚϧνεϨουରԠ wݫ֨ͳྫ֎ॲཧػߏ w6OJDPEFΛશ໘తʹ࠾༻

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Write Once, Run Anywhere • OSɺJava VM࣮૷ʹґଘ͠ͳ͍ • ݹ͍ίʔυ͕࠷৽ͷJavaͰ΋ಈ͘ • Blu-ray͔ΒڊେγεςϜ·Ͱ

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౰ॳ04ͷࠩҟΛ+BWB7.͕ٵऩ͢Δ ݱࡏ+BWB7.͕ଟݴޠͷڞ௨ج൫΁

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Essential Java

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JavaͷΤίγεςϜ

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ΫϥεͱΠϯλϑΣʔε

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! ! Ϋϥεͷܧঝ

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" # " Polymorphismͱ͸

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$%& '&( ( )&%%% ϓϩηεͱεϨου

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$%& '&( ( )&%%% $%* $%* $%* + + ϓϩηεͱεϨου

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, "- # ./0 , 0 #- ./0 " " " " " " -""1 +BWBͷೖग़ྗ 4USFBN ݱࡏͰ͸จࣈྻσʔλʹಛԽͨ͠3FBEFS8SJUFS΍ɺ ߴ଎*0Λ࣮ݱ͢Δ$IBOOFM΋Α͘࢖ΘΕ͍ͯΔ

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+BWBͷύοέʔδ

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Ϋϥε໊ͷදهํ๏ wݪଇύοέʔδΛؚΉ׬શ໊  ྫ java.util.List wimportએݴಛఆͷύοέʔδΛলུՄ  ํ๏ import java.util.List;  ํ๏ import java.util.*; wjava.langʜৗʹύοέʔδΛলུՄ

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+BWBΫϥεͷಉҰੑ • Ϋϥε໊͕ಉҰͰ͋Δ • ύοέʔδ໊͕׬શʹҰக͍ͯ͠Δ • ಉ͡Ϋϥεϩʔμʔ͔ΒಡΈࠐ·Εͨ

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Java Core Parts

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ΫϥεͱΦϒδΣΫτ • Ϋϥε͸ఆٛͷΈ…࣮ମ͕ͳ͍ • ΦϒδΣΫτ(Πϯελϯε)  …Ϋϥε͔Β࡞੒࣮ͨ͠ମͷ͜ͱ • ϑΟʔϧυͱϝιου͸ΦϒδΣΫτʹ ଐ͢Δ(㱻static͸Ϋϥεʹଐ͢Δ)

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java.lang.Object • JavaͷશΫϥεͷεʔύʔΫϥε • ΫϥεͷࠜװʹؔΘΔϝιουΛ࣋ͭ • ϓϦϛςΟϒܕʹରͯ͠ϦϑΝϨϯεܕ ͱݺ͹ΕΔ͜ͱ΋͋Δ

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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)

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Object o = new Object();

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Object o = new Object();

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Object o = new Object(); ӈลͱಉ͡Ϋϥε PS εʔύʔΫϥε PS ࣮૷ΠϯλϑΣʔε

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Object o = new ArrayList();

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Ωϟετ Object o = new ArrayList(); • objͷఆٛ͸Objectɺ࣮ମ͸ArrayList • ΞΫηε͸ఆٛΛ௨ͯ͡ߦ͏ • ࣮ମ΁ͷ௚઀ΞΫηεˠΩϟετ ArrayList list = (ArrayList) o; w Ωϟετ=αϒΫϥεͷఆٛͰΞΫηε w Ωϟετޙ͸࣮ମʹ௚઀ΞΫηεՄೳ

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ϓϦϛςΟϒܕ • ΫϥεͰ͸ͳ͍σʔλܕ • ରԠ͢ΔΫϥε(ϥούʔ)Λ࣋ͭ • auto-boxing/unboxing:  ϓϦϛςΟϒܕͱϥούʔͷ૬ޓม׵

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ϓϦϛςΟϒܕ ϥούʔΫϥε boolean Boolean byte Byte char Character short Short int Integer long Long ﬂoat Float double Double

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഑ྻ • ಉ͡ΫϥεorϓϦϛςΟϒܕͷ࿈ଓ • ԋࢉࢠ [ ] ͰཁૉʹΞΫηε͢Δ • ಺෦తʹ͸java.lang.ArrayΫϥε

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Object[ ] o = new Object[8]; P͸0CKFDUͷ഑ྻ ཁૉ਺͸ࢦఆ͠ͳ͍ ഑ྻͷཁૉ਺͸ ඞͣఆ਺ޙͰมߋෆՄ ഑ྻͷ৔߹ɺࠨลͱӈล͸ಉ͡Ϋϥε

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ͦ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)

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Fundamental Java HASUNUMA Kenji k.hasunuma@coppermine.jp Twitter: @btnrouge