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"OESPJEΞϓϦΛ࡞Δ,.$OPOZMFOF+BWBޙ
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ࣗݾհw OPOZMFOF ͷʹΕΜw ,.$ճw SPPU
ࣗݾհw OPOZMFOF ͷʹΕΜw εϚϗΞϓϦͱ͔w 5XJUUFS(JU)VCFUDw IUUQOPOZMFOFIBUFOBCMPHKQ
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ࠓΔ͜ͱ +BWBޙ Ϋϥεܧঝ ܕมʢΩϟετʣ ͦͷଞ+BWBͷจ๏
+BWBޙ
Ϋϥεܧঝ
Ϋϥεܧঝͱw ͋ΔΫϥεΛݩʹͯ͠৽͍͠ΫϥεΛ࣮w ॲཧͷڞ௨ԽɾΫϥεͷ֊Խ
Ϋϥεܧঝͱw +BWBͰҰͭͷΫϥε͔Β͔͠ܧঝͰ͖ͳ͍w ʢଟॏܧঝͰ͖ͳ͍ʣ
ΫϥεࢠΫϥεܧঝʢεʔύʔΫϥεʣʢαϒΫϥεʣ
࣮ྫ
·Μ͕λΠϜ͖ΒΒ ͰֶͿΫϥεܧঝ
·Μ͕λΠϜ͖ΒΒͱw ๕จࣾͷίϚϚϯΨࢽͦͷ࢞ຓࢽ܈w ·Μ͕λΠϜͷएऀ͚ͱ͍͏Ґஔ͚ͮ
·Μ͕λΠϜ͖ΒΒୡw ·Μ͕λΠϜ͖ΒΒw ·Μ͕λΠϜ͖ΒΒΩϟϥοτw ·Μ͕λΠϜ͖ΒΒ."9w ·Μ͕λΠϜ͖ΒΒϑΥϫʔυw ·Μ͕λΠϜ͖ΒΒϛϥΫ
·Μ͕λΠϜ͖ΒΒ·Μ͕λΠϜ͖ΒΒ·Μ͕λΠϜ͖ΒΒΩϟϥοτ·Μ͕λΠϜ͖ΒΒ."9·Μ͕λΠϜ͖ΒΒϑΥϫʔυ·Μ͕λΠϜ͖ΒΒϛϥΫ
ίϛοΫࡶࢽ·Μ͕λΠϜ͖ΒΒ·Μ͕λΠϜ͖ΒΒ·Μ͕λΠϜ͖ΒΒΩϟϥοτ·Μ͕λΠϜ͖ΒΒ."9·Μ͕λΠϜ͖ΒΒϑΥϫʔυ·Μ͕λΠϜ͖ΒΒϛϥΫ
ίϛοΫࡶࢽࡶࢽ·Μ͕λΠϜ͖ΒΒ·Μ͕λΠϜ͖ΒΒ·Μ͕λΠϜ͖ΒΒΩϟϥοτ·Μ͕λΠϜ͖ΒΒ."9·Μ͕λΠϜ͖ΒΒϑΥϫʔυ·Μ͕λΠϜ͖ΒΒϛϥΫ
ComicMagazineMagazineBaseMangaTimeKiraraMangaTimeKirara,MangaTimeKiraraCarat,MangaTimeKiraraMax, etc…
MagazineBaseMangaTimeKiraraMangaTimeKirara,MangaTimeKiraraCarat,MangaTimeKiraraMax, etc…( MangaTimeKirara ͕͋ΔͨΊ )ComicMagazine
.BHB[JOFΫϥε࣮w λΠτϧɾδϟϯϧɾձࣾɾ߸Λอ࣋w આ໌༻จষग़ྗ͢Δ
.BHB[JOFΫϥε࣮* Magazine.javaclass Magazine {private String title;private String genre;private String company;private int number;public Magazine(String title, String genre, String company, int number) {this.title = title;this.genre = genre;this.company = company;this.number = number;}public String getInfoText() {return company + " ͷ " + title + number + "߸";}}
$PNJD.BHB[JOF࣮w δϟϯϧອըͩͱ͔͍ͬͯΔˠ δϟϯϧͷҾෆཁ w ·ͣී௨ʹ࣮
$PNJD.BHB[JOF࣮* ComicMagazine.javaclass ComicMagazine {private String title;private String genre = "ອըࡶࢽ";private String company;private int number;public ComicMagazine(String title, String company, int number) {this.title = title;this.company = company;this.number = number;}public String getInfoText() {return company + "ͷ" + title + number + "݄߸";}}
$PNJD.BHB[JOF࣮ComicMagazine magazine =new ComicMagazine("·Μ͕λΠϜ͖ΒΒMAX", "๕จࣾ", 1);String text = magazine.getInfoText();
.BHB[JOFܧঝw MagazineΛܧঝ͢ΔΑ͏ʹมߋ͢Δ• extends Magazine
.BHB[JOFܧঝw Magazine͔ΒϝϯόมϝιουFUDʜ͕Ҿ͖ܧ͕ΕΔw ίϯετϥΫλҾ͖ܧ͕Εͳ͍w ࢠΫϥεͰݺͿඞཁ͕͋ΔMagazine ComicMagazinetitile / author …getInfoText() ࢠ
.BHB[JOFܧঝw Magazine͔ΒϝϯόมϝιουFUDʜ͕Ҿ͖ܧ͕ΕΔw ࢠΫϥε෦͔Βݟ͑Δ͔Ͳ͏͔ผw privateͳͷݟ͑ͳ͍Magazine ComicMagazinetitile / author …getInfoText() ࢠ
.BHB[JOFܧঝ* CodeMagazine.javaclass ComicMagazine extends Magazine {public ComicMagazine(String title, String company,int number) {super(title, "ອըࡶࢽ", company, number);}}Magazine Λܧঝ
.BHB[JOFܧঝ* CodeMagazine.javaclass ComicMagazine extends Magazine {public ComicMagazine(String title, String company,int number) {super(title, "ອըࡶࢽ", company, number);}}Magazine ʹఆٛ͞ΕͨίϯετϥΫλΛݺͿ※ genre Λৗʹ “ອըࡶࢽ” ͱ͍ͯ͠Δ
.BHB[JOFܧঝComicMagazine magazine =new ComicMagazine("·Μ͕λΠϜ͖ΒΒMAX", "๕จࣾ", 1);String text = magazine.getInfoText();Magazine ͷϝιου͕͑Δ
#BTF.BOHB5JNF,JSBSB࣮w ͖ΒΒୡڞ௨ͷ৽͍͠ػೳΛ࡞Γ͍ͨw දࢴΛ০Δ࡞Λཧ͍ͨ͠ ˠ ৽͍͠ม coverTitle͕ඞཁˠ ৽͍͠Ϋϥε BaseMangaTimeKirara
* BaseMangaTimeKirara.javaclass BaseMangaTimeKirara extends ComicMagazine {private String coverTitle;public BaseMangaTimeKirara(String title,String coverTitle, int number) {super(title, "๕จࣾ", number);this.coverTitle = coverTitle;}public String getCoverTitle() {return coverTitle;}}#BTF.BOHB5JNF,JSBSB࣮coverTitle มΛఆٛ
* BaseMangaTimeKirara.javaclass BaseMangaTimeKirara extends ComicMagazine {private String coverTitle;public BaseMangaTimeKirara(String title,String coverTitle, int number) {super(title, "๕จࣾ", number);this.coverTitle = coverTitle;}public String getCoverTitle() {return coverTitle;}}#BTF.BOHB5JNF,JSBSB࣮ComicMagazine ΫϥεͷίϯετϥΫλΛݺͿ
* BaseMangaTimeKirara.javaclass BaseMangaTimeKirara extends ComicMagazine {private String coverTitle;public BaseMangaTimeKirara(String title,String coverTitle, int number) {super(title, "๕จࣾ", number);this.coverTitle = coverTitle;}public String getCoverTitle() {return coverTitle;}}#BTF.BOHB5JNF,JSBSB࣮coverTitle ʹೖ͢Δ※ ComicMagazine ʹ coverTitle ͳ͍
* BaseMangaTimeKirara.javaclass BaseMangaTimeKirara extends ComicMagazine {private String coverTitle;public BaseMangaTimeKirara(String title,String coverTitle, int number) {super(title, "๕จࣾ", number);this.coverTitle = coverTitle;}public String getCoverTitle() {return coverTitle;}}#BTF.BOHB5JNF,JSBSB࣮getCoverTitle() ϝιουΛఆٛ※ ComicMagazine ʹ getCoverTitle() ͳ͍
#BTF.BOHB5JNF,JSBSBBaseMangaTimeKirara kirara =new BaseMangaTimeKirara(“·Μ͕λΠϜ͖ΒΒMAX”,"͖Μ͍ΖϞβΠΫ", 1);String cover = kirara.getCoverTitle();String text = kirara.getInfoText();
.BOHB5JNF,JSBSB."9࣮w ͖ΒΒ."9Ͱઆ໌จΛม͍͑ͨw ࠓʮ๕จࣾͷ·Μ͕λΠϜ͖ΒΒ."9݄߸ʯw ."9 ʮ·Μ͕λΠϜ͖ΒΒͷυΩυΩϏδϡΞϧίϛοΫεʂࠓ݄ͷ·Μ͕λΠϜ͖ΒΒ."9݄߸ͷදࢴ͖Μ͍ΖϞβΠΫʂʯ
.BOHB5JNF,JSBSB."9࣮w getInfoText()ͷ༰Λมߋ͢Δඞཁ ˠ ΦʔόʔϥΠυ 0WFSSJEFΛߦ͏
w લ४උw MangaTimeKiraraMAX͔Β title / number / coverTitle ʹ ΞΫηεͰ͖ΔΑ͏ʹ͢Δ.BOHB5JNF,JSBSB."9࣮
w લ४උw ࠓճϝϯόมͷΞΫηεम০ࢠΛมߋw ϝιουΛ࡞͢Δ߹͋Δw private ࣗͷΫϥεͷΈ protected ࣗͱࢠΫϥεͷΈ.BOHB5JNF,JSBSB."9࣮
ΞΫηεम০ࢠมߋ* Magazine.javaclass Magazine {protected String title;private String genre;private String company;protected int number;public Magazine(…}
ΞΫηεम০ࢠมߋ* BaseMangaTimeKirara.javaclass BaseMangaTimeKirara extends ComicMagazine {protected String coverTitle;public BaseMangaTime…}
.BOHB5JNF,JSBSB."9࣮w getInfoText() ΛΦʔόʔϥΠυ͢Δw @OverrideΞϊςʔγϣϯ ޙड़Λ͚Δw ͚ͳͯ͘ίϯύΠϧ௨Δέʔε͋Δ͚Ͳ ͚·͠ΐ͏
.BOHB5JNF,JSBSB."9࣮* MangaTimeKiraraMAX.javaclass MangaTimeKiraraMAX extends BaseMangaTimeKirara {public MangaTimeKiraraMAX(String coverTitle, int number) {super("·Μ͕λΠϜ͖ΒΒMAX", coverTitle, number);}@Overridepublic String getInfoText() {return "·Μ͕λΠϜ͖ΒΒͷυΩυΩϏδϡΞϧίϛοΫε!ࠓ݄ͷ" +title + number + "݄߸ͷදࢴ" + coverTitle + "!";}}getInfoText() Λ Override ͢Δ
BaseMangaTimeKirara kirara = new BaseMangaTimeKirara("·Μ͕λΠϜ͖ΒΒMAX", "͖Μ͍ΖϞβΠΫ" , 1);String text = kirara.getInfoText();MangaTimeKiraraMAX max = new MangaTimeKiraraMAX("͖Μ͍ΖϞβΠΫ" , 1);String maxText = max.getInfoText();.BOHB5JNF,JSBSB."9UFYU๕จࣾͷ·Μ͕λΠϜ͖ΒΒ."9݄߸NBY5FYU·Μ͕λΠϜ͖ΒΒͷυΩυΩʢུʣ
Կ͕خ͍͔͠w ࡶࢽؔͷॲཧΛߦ͍͍ͨ࣌ʜw ࡶࢽશମͷॲཧMagazineΛҾʹऔΔw ଞͷMagazineͷࢠΫϥε͑Δw ·Μ͕λΠϜ͖ΒΒઐ༻ͷॲཧ MangaTimeKiraraΛҾʹऔΔ
ྫpublic void printInfo(Magazine magazine) {System.out.println(magazine.getInfoText());}public void printCoverTitle(BaseMangaTimeKirara magazine) {System.out.println(magazine.getCoverTitle());}MangaTimeKiraraMAX max =new MangaTimeKiraraMAX("͖Μ͍ΖϞβΠΫ" , 1);printInfo(max);printCoverTitle(max);
"CTUSBDU Ϋϥε
"CTUSBDUΫϥεw +BQBOFTFநΫϥεw 㲗۩ମw ϝιουͷ۩ମతͳॲཧΛࢠΫϥεʹͤΔw ϝιουΛ࣮ͤͣʹએݴ͚ͩ͢Δ͜ͱ͕Ͱ͖Δw "CTUSBDUͰͳ͍ࢠΫϥεඞͣϝιουΛ࣮
"CTUSBDUΫϥεw ۩ମతͳॲཧΛॻ͔ͳͯ͘ྑ͍ ˠ ܧঝ͞ΕΔ͜ͱ͕લఏͷΫϥεˠ "CTUSBDUΫϥεࣗମͷΦϒδΣΫτ ࡞Εͳ͍
ྫw ·Μ͕λΠϜ͖ΒΒઐ༻ʹɺ ΞχϝԽ͍ͯ͠Δອը͕͋Εฦ͢ػೳ࡞w ͱΓ͋͑ͣࠓճΫϥε͝ͱʹݻఆΛฦ͢w BaseMangaTimeKiraraΛ"CTUSBDUʹw ͜ͷΫϥεࡶࢽͦͷͷͰͳ͍w ܧঝ͞ΕΔ͜ͱ͕લఏ
* BaseMangaTimeKirara.javaabstract class BaseMangaTimeKirara extends ComicMagazine {protected String coverTitle;public BaseMangaTimeKirara(String title, StringcoverTitle, int number) {super(title, , number);this.coverTitle = coverTitle;}public String getCoverTitle() {return coverTitle;}public abstract String getAnimeTitle();}abstract म০ࢠΛ͚ͭΔ
* BaseMangaTimeKirara.javaabstract class BaseMangaTimeKirara extends ComicMagazine {protected String coverTitle;public BaseMangaTimeKirara(String title, StringcoverTitle, int number) {super(title, , number);this.coverTitle = coverTitle;}public String getCoverTitle() {return coverTitle;}public abstract String getAnimeTitle();}BCTUSBDUϝιουΛՃʢ࣮ॻ͔ͳ͍ʣ
w getAnimeTitle()ΛΦʔόʔϥΠυ͢Δw ͠ͳ͍ͱίϯύΠϧΤϥʔ.BOHB5JNF,JSBSB."9࣮
* MangaTimeKiraraMAX.javaclass MangaTimeKiraraMAX extends BaseMangaTimeKirara {public MangaTimeKiraraMAX(String coverTitle,int number) {super("·Μ͕λΠϜ͖ΒΒMAX", coverTitle, number);}@Overridepublic String getInfoText() {return “·Μ͕λΠϜ͖ΒΒ…" + …(ུ);}@Overridepublic String getAnimeTitle() {return "εςϥͷ·΄͏";}}
"CTUSBDUΫϥεΛҾʹpublic void printAnimeTitle(BaseMangaTimeKirara magazine) {System.out.println( magazine.getAnimeTitle() );}// BaseMangaTimeKirara ͏ΦϒδΣΫτΛ࡞Ͱ͖ͳ͍MangaTimeKiraraMAX max =new MangaTimeKiraraMAX("͖Μ͍ΖϞβΠΫ" , 1);printAnimeTitle(max);௨ৗͷΫϥεͱಉ͡Α͏ʹϝιουΛݺΔ
*OUFSGBDF
*OUFSGBDFw ΠϯλʔϑΣʔεw நϝιουͱఆͷΈw ܕͱͯ͑͠ΔʢࣅͯΔ͕ΫϥεͰͳ͍ʣw ΦϒδΣΫτΛ࡞Ͱ͖ͳ͍w ΠϯλʔϑΣʔεΛʮ࣮ JNQMFNFOU͢Δʯͱ͍͏
*OUFSGBDFͱ "CTUSBDU$MBTTw "CTUSBDU$MBTTࢠؔw " ࢠJT# w *OUFSGBDFೳྗతͳײ͡w " ΫϥεDBO# ΠϯλʔϑΣʔε
*OUFSGBDFw ΠϯλʔϑΣʔεଟॏʹ࣮Մೳʢॏཁʣw ʮ͜ͷΫϥε͜͏͍͏ػೳΛ࣋ͪ·͢Αʯͱ͍͏ҙຯ߹͍ͳͷͰ
ྫw ࡶࢽΛϑΝΠϧʹग़ྗ͍ͨ͠w ʮϑΝΠϧʹग़ྗͰ͖Δͭʯͱ͍͏*OUFSGBDFΛ࡞Δ• FileExpotable Λ࡞Δ
* FileExportable.javainterface FileExportable {public void export();ʩ'JMF&YQPSUBCMF࣮interface Λఆٛ
* FileExportable.javainterface FileExportable {void export();ʩ'JMF&YQPSUBCMF࣮ϝιουΛఆٛ (abstract ෆཁ)
.BHB[JOF࣮w MagazineʹFileExportableΛ࣮͢Δ
class Magazine implements FileExportable {protected String tit…public Magazine(String titl…) {this.title = ti…;}public String getInfoText() {return co…}@Overridepublic void export() {// export ॲཧΛॻ͘}}FileExportable Λ implement ͢Δ
class Magazine implements FileExportable {protected String tit…public Magazine(String titl…) {this.title = ti…;}public String getInfoText() {return co…}@Overridepublic void export() {// export ॲཧΛॻ͘}}export ϝιουΛ࣮͢Δ
class Magazine implements FileExportable, Hoge, Piyo {}w *OUFSGBDFෳ࣮Մೳw “,”Ͱ۠ͬͯॻ͘w ͦΕͧΕʹఆٛ͞ΕͨϝιουΛ࣮͢Δ
w ܧঝͱ࣮ಉ࣌ʹߦ͑Δw ܧঝ࣮ؒͰϝιου໊͕ඃͬͯ0,class BaseMangaTimeKirara extends ComicMagazine implements Foo {}
public void exportFile( FileExportable exportable ) {exportable.export();}MangaTimeKiraraMAX max =new MangaTimeKiraraMAX("͖Μ͍ΖϞβΠΫ" , 1);exportFile(max);ҾͷܕʹΠϯλʔϑΣʔεΛࢦఆ͢Δ
public void exportFile( FileExportable exportable ) {exportable.export();}MangaTimeKiraraMAX max =new MangaTimeKiraraMAX("͖Μ͍ΖϞβΠΫ" , 1);exportFile(max);FileExportable Λ࣮͍ͯ͠ΔΫϥεͰݺͼग़͠
ComicMagazineMagazineBaseMangaTimeKiraraMangaTimeKirara,MangaTimeKiraraCarat,MangaTimeKiraraMax, etc…FileExportableHogeFoo
ܕม
ܕมw ϓϩάϥϜͷதͰมΛ ͲͷΫϥεɾΠϯλʔϑΣʔεͱͯ͠ѻ͏͔w มߋͯ͠ΦϒδΣΫτͷ࣮ମมΘΒͳ͍ˠ ϝιουɾมͷ݁ՌมΘΒͳ͍ ʢݺͼग़ͤΔϝιουɾม͕มΘΔʣ
ܕมͷछྨw ҉తܕมw ࣗ໌ͳͷw উखʹͬͯ͘ΕΔw ໌ࣔతܕมʢΩϟετʣw ࣗ໌Ͱͳ͍ͷw ࣗͰ໌ࣔ͢Δඞཁ͕͋Δ
ܕมͷྫw ΫϥεΛҾʹऔΔϝιουʹࢠΫϥεΛೖΕΔ࣌ʹܕม͢Δʢ҉తʣ w ܕม͢Δ͜ͱͰΫϥεʹͳ͍ࢠΫϥεͷϝιουΛݺͼग़͢ʢ໌ࣔతʣ
҉తͳܕมComicMagazineMagazineMagazine magazine = new ComicMagazine(…); ࢠ
҉తͳܕมFileExportable exportable = new Magazine(…);ΠϯλʔϑΣʔε ࣮ΫϥεFileExportable Magazine
҉తͳܕมFileExportable exportable = new MangaTimeKirara(…);ΠϯλʔϑΣʔε ࣮ΫϥεͷࢠΫϥεɹFileExportable MangaTimeKirara
҉తͳܕม ʢϓϦϛςΟϒܕʣਫ਼ߴ͍ ਫ਼͍long intlong longValue = 2;ৄࡉ: http://www.atmarkit.co.jp/ait/articles/0803/18/news149.html
ComicMagazineMagazineMagazine magazine = new ComicMagazine(…);ComicMagazine comicMagazine = (ComicMagazine) magazine; ࢠ໌ࣔతͳܕมʢΩϟετʣ
FileExportable exportable = new Magazine(…);Magazine magazine = (Magazine) magazine;ΠϯλʔϑΣʔε ࣮ΫϥεFileExportable Magazine໌ࣔతͳܕมʢΩϟετʣ
໌ࣔతͳܕม ʢΩϟετ ϓϦϛςΟϒܕʣਫ਼ߴ͍ ਫ਼͍long intlong longValue = 2;int intValue = (int) longValue;ৄࡉ: http://www.atmarkit.co.jp/ait/articles/0803/18/news149.html
ଓ͖HJTUͰIUUQTHJTUHJUIVCDPNOPOZMFOFFBGGFGBGDFFBC
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