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"OESPJEΞϓϦΛ࡞Δ
,.$OPOZMFOF
+BWBޙ
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ࣗݾհ
w OPOZMFOF ͷʹΕΜ
w ,.$ճ
w SPPU
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ࣗݾհ
w OPOZMFOF ͷʹΕΜ
w εϚϗΞϓϦͱ͔
w 5XJUUFS(JU)VCFUD
w IUUQOPOZMFOFIBUFOBCMPHKQ
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͜ΜΜ
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ࠓΔ͜ͱ
+BWBޙ
Ϋϥεܧঝ
ܕมʢΩϟετʣ
ͦͷଞ+BWBͷจ๏
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+BWBޙ
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Ϋϥεܧঝ
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Ϋϥεܧঝͱ
w ͋ΔΫϥεΛݩʹͯ͠৽͍͠ΫϥεΛ࣮
w ॲཧͷڞ௨ԽɾΫϥεͷ֊Խ
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Ϋϥεܧঝͱ
w +BWBͰҰͭͷΫϥε͔Β͔͠ܧঝͰ͖ͳ͍
w ʢଟॏܧঝͰ͖ͳ͍ʣ
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Ϋϥε
ࢠΫϥε
ܧঝ
ʢεʔύʔΫϥεʣ
ʢαϒΫϥεʣ
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࣮ྫ
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·Μ͕λΠϜ͖ΒΒ
ͰֶͿΫϥεܧঝ
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·Μ͕λΠϜ͖ΒΒͱ
w ๕จࣾͷίϚϚϯΨࢽͦͷ࢞ຓࢽ܈
w ·Μ͕λΠϜͷएऀ͚ͱ͍͏Ґஔ͚ͮ
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·Μ͕λΠϜ͖ΒΒୡ
w ·Μ͕λΠϜ͖ΒΒ
w ·Μ͕λΠϜ͖ΒΒΩϟϥοτ
w ·Μ͕λΠϜ͖ΒΒ."9
w ·Μ͕λΠϜ͖ΒΒϑΥϫʔυ
w ·Μ͕λΠϜ͖ΒΒϛϥΫ
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·Μ͕λΠϜ͖ΒΒ
·Μ͕λΠϜ
͖ΒΒ
·Μ͕λΠϜ
͖ΒΒ
Ωϟϥοτ
·Μ͕λΠϜ
͖ΒΒ
."9
·Μ͕λΠϜ
͖ΒΒ
ϑΥϫʔυ
·Μ͕λΠϜ
͖ΒΒ
ϛϥΫ
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ίϛοΫࡶࢽ
·Μ͕λΠϜ͖ΒΒ
·Μ͕λΠϜ
͖ΒΒ
·Μ͕λΠϜ
͖ΒΒ
Ωϟϥοτ
·Μ͕λΠϜ
͖ΒΒ
."9
·Μ͕λΠϜ
͖ΒΒ
ϑΥϫʔυ
·Μ͕λΠϜ
͖ΒΒ
ϛϥΫ
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ίϛοΫࡶࢽ
ࡶࢽ
·Μ͕λΠϜ͖ΒΒ
·Μ͕λΠϜ
͖ΒΒ
·Μ͕λΠϜ
͖ΒΒ
Ωϟϥοτ
·Μ͕λΠϜ
͖ΒΒ
."9
·Μ͕λΠϜ
͖ΒΒ
ϑΥϫʔυ
·Μ͕λΠϜ
͖ΒΒ
ϛϥΫ
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ComicMagazine
Magazine
BaseMangaTimeKirara
MangaTimeKirara,
MangaTimeKiraraCarat,
MangaTimeKiraraMax, etc…
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Magazine
BaseMangaTimeKirara
MangaTimeKirara,
MangaTimeKiraraCarat,
MangaTimeKiraraMax, etc…
( MangaTimeKirara ͕͋ΔͨΊ )
ComicMagazine
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.BHB[JOFΫϥε࣮
w λΠτϧɾδϟϯϧɾձࣾɾ߸Λอ࣋
w આ໌༻จষग़ྗ͢Δ
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.BHB[JOFΫϥε࣮
* Magazine.java
class 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 + "߸";
}
}
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$PNJD.BHB[JOF࣮
w δϟϯϧອըͩͱ͔͍ͬͯΔ
ˠ δϟϯϧͷҾෆཁ
w ·ͣී௨ʹ࣮
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$PNJD.BHB[JOF࣮
* ComicMagazine.java
class 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 + "݄߸";
}
}
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$PNJD.BHB[JOF࣮
ComicMagazine magazine =
new ComicMagazine("·Μ͕λΠϜ͖ΒΒMAX", "๕จࣾ", 1);
String text = magazine.getInfoText();
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.BHB[JOFܧঝ
w MagazineΛܧঝ͢ΔΑ͏ʹมߋ͢Δ
• extends Magazine
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.BHB[JOFܧঝ
w Magazine͔ΒϝϯόมϝιουFUDʜ
͕Ҿ͖ܧ͕ΕΔ
w ίϯετϥΫλҾ͖ܧ͕Εͳ͍
w ࢠΫϥεͰݺͿඞཁ͕͋Δ
Magazine ComicMagazine
titile / author …
getInfoText()
ࢠ
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.BHB[JOFܧঝ
w Magazine͔ΒϝϯόมϝιουFUDʜ
͕Ҿ͖ܧ͕ΕΔ
w ࢠΫϥε෦͔Βݟ͑Δ͔Ͳ͏͔ผ
w privateͳͷݟ͑ͳ͍
Magazine ComicMagazine
titile / author …
getInfoText()
ࢠ
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.BHB[JOFܧঝ
* CodeMagazine.java
class ComicMagazine extends Magazine {
public ComicMagazine(String title, String company,
int number) {
super(title, "ອըࡶࢽ", company, number);
}
}
Magazine Λܧঝ
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.BHB[JOFܧঝ
* CodeMagazine.java
class ComicMagazine extends Magazine {
public ComicMagazine(String title, String company,
int number) {
super(title, "ອըࡶࢽ", company, number);
}
}
Magazine ʹఆٛ͞ΕͨίϯετϥΫλΛݺͿ
※ genre Λৗʹ “ອըࡶࢽ” ͱ͍ͯ͠Δ
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.BHB[JOFܧঝ
ComicMagazine magazine =
new ComicMagazine("·Μ͕λΠϜ͖ΒΒMAX", "๕จࣾ", 1);
String text = magazine.getInfoText();
Magazine ͷϝιου͕͑Δ
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#BTF.BOHB5JNF,JSBSB࣮
w ͖ΒΒୡڞ௨ͷ৽͍͠ػೳΛ࡞Γ͍ͨ
w දࢴΛ০Δ࡞Λཧ͍ͨ͠
ˠ ৽͍͠ม coverTitle
͕ඞཁ
ˠ ৽͍͠Ϋϥε BaseMangaTimeKirara
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* BaseMangaTimeKirara.java
class 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,JSBSB࣮
coverTitle มΛఆٛ
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* BaseMangaTimeKirara.java
class 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,JSBSB࣮
ComicMagazine ΫϥεͷίϯετϥΫλΛݺͿ
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* BaseMangaTimeKirara.java
class 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,JSBSB࣮
coverTitle ʹೖ͢Δ
※ ComicMagazine ʹ coverTitle ͳ͍
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* BaseMangaTimeKirara.java
class 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,JSBSB࣮
getCoverTitle() ϝιουΛఆٛ
※ ComicMagazine ʹ getCoverTitle() ͳ͍
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#BTF.BOHB5JNF,JSBSB
BaseMangaTimeKirara kirara =
new BaseMangaTimeKirara(“·Μ͕λΠϜ͖ΒΒMAX”,
"͖Μ͍ΖϞβΠΫ", 1);
String cover = kirara.getCoverTitle();
String text = kirara.getInfoText();
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.BOHB5JNF,JSBSB."9࣮
w ͖ΒΒ."9Ͱઆ໌จΛม͍͑ͨ
w ࠓʮ๕จࣾͷ·Μ͕λΠϜ͖ΒΒ."9݄߸ʯ
w ."9
ʮ·Μ͕λΠϜ͖ΒΒͷυΩυΩϏδϡΞϧίϛο
Ϋεʂࠓ݄ͷ·Μ͕λΠϜ͖ΒΒ."9݄߸ͷද
ࢴ͖Μ͍ΖϞβΠΫʂʯ
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.BOHB5JNF,JSBSB."9࣮
w getInfoText()ͷ༰Λมߋ͢Δඞཁ
ˠ ΦʔόʔϥΠυ 0WFSSJEF
Λߦ͏
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w લ४උ
w MangaTimeKiraraMAX͔Β
title / number / coverTitle ʹ
ΞΫηεͰ͖ΔΑ͏ʹ͢Δ
.BOHB5JNF,JSBSB."9࣮
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w લ४උ
w ࠓճϝϯόมͷΞΫηεम০ࢠΛมߋ
w ϝιουΛ࡞͢Δ߹͋Δ
w private ࣗͷΫϥεͷΈ
protected ࣗͱࢠΫϥεͷΈ
.BOHB5JNF,JSBSB."9࣮
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ΞΫηεम০ࢠมߋ
* Magazine.java
class Magazine {
protected String title;
private String genre;
private String company;
protected int number;
public Magazine(…
}
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ΞΫηεम০ࢠมߋ
* BaseMangaTimeKirara.java
class BaseMangaTimeKirara extends ComicMagazine {
protected String coverTitle;
public BaseMangaTime…
}
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.BOHB5JNF,JSBSB."9࣮
w getInfoText() ΛΦʔόʔϥΠυ͢Δ
w @OverrideΞϊςʔγϣϯ ޙड़
Λ͚Δ
w ͚ͳͯ͘ίϯύΠϧ௨Δέʔε͋Δ͚Ͳ
͚·͠ΐ͏
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.BOHB5JNF,JSBSB."9࣮
* MangaTimeKiraraMAX.java
class MangaTimeKiraraMAX extends BaseMangaTimeKirara {
public MangaTimeKiraraMAX(String coverTitle, int number) {
super("·Μ͕λΠϜ͖ΒΒMAX", coverTitle, number);
}
@Override
public String getInfoText() {
return "·Μ͕λΠϜ͖ΒΒͷυΩυΩϏδϡΞϧίϛοΫε!ࠓ݄ͷ" +
title + number + "݄߸ͷදࢴ" + coverTitle + "!";
}
}
getInfoText() Λ Override ͢Δ
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BaseMangaTimeKirara kirara = new BaseMangaTimeKirara(
"·Μ͕λΠϜ͖ΒΒMAX", "͖Μ͍ΖϞβΠΫ" , 1);
String text = kirara.getInfoText();
MangaTimeKiraraMAX max = new MangaTimeKiraraMAX(
"͖Μ͍ΖϞβΠΫ" , 1);
String maxText = max.getInfoText();
.BOHB5JNF,JSBSB."9
UFYU๕จࣾͷ·Μ͕λΠϜ͖ΒΒ."9݄߸
NBY5FYU·Μ͕λΠϜ͖ΒΒͷυΩυΩʢུʣ
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Կ͕خ͍͔͠
w ࡶࢽؔͷॲཧΛߦ͍͍ͨ࣌ʜ
w ࡶࢽશମͷॲཧMagazineΛҾʹऔΔ
w ଞͷMagazineͷࢠΫϥε͑Δ
w ·Μ͕λΠϜ͖ΒΒઐ༻ͷॲཧ
MangaTimeKiraraΛҾʹऔΔ
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ྫ
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);
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"CTUSBDU
Ϋϥε
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"CTUSBDUΫϥε
w +BQBOFTFநΫϥε
w 㲗۩ମ
w ϝιουͷ۩ମతͳॲཧΛࢠΫϥεʹͤΔ
w ϝιουΛ࣮ͤͣʹએݴ͚ͩ͢Δ͜ͱ͕Ͱ͖Δ
w "CTUSBDUͰͳ͍
ࢠΫϥεඞͣϝιουΛ࣮
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"CTUSBDUΫϥε
w ۩ମతͳॲཧΛॻ͔ͳͯ͘ྑ͍
ˠ ܧঝ͞ΕΔ͜ͱ͕લఏͷΫϥε
ˠ "CTUSBDUΫϥεࣗମͷΦϒδΣΫτ
࡞Εͳ͍
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ྫ
w ·Μ͕λΠϜ͖ΒΒઐ༻ʹɺ
ΞχϝԽ͍ͯ͠Δອը͕͋Εฦ͢ػೳ࡞
w ͱΓ͋͑ͣࠓճΫϥε͝ͱʹݻఆΛฦ͢
w BaseMangaTimeKiraraΛ"CTUSBDUʹ
w ͜ͷΫϥεࡶࢽͦͷͷͰͳ͍
w ܧঝ͞ΕΔ͜ͱ͕લఏ
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* BaseMangaTimeKirara.java
abstract class BaseMangaTimeKirara extends ComicMagazine {
protected String coverTitle;
public BaseMangaTimeKirara(String title, String
coverTitle, int number) {
super(title, , number);
this.coverTitle = coverTitle;
}
public String getCoverTitle() {
return coverTitle;
}
public abstract String getAnimeTitle();
}
abstract म০ࢠΛ͚ͭΔ
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* BaseMangaTimeKirara.java
abstract class BaseMangaTimeKirara extends ComicMagazine {
protected String coverTitle;
public BaseMangaTimeKirara(String title, String
coverTitle, int number) {
super(title, , number);
this.coverTitle = coverTitle;
}
public String getCoverTitle() {
return coverTitle;
}
public abstract String getAnimeTitle();
}
BCTUSBDUϝιουΛՃʢ࣮ॻ͔ͳ͍ʣ
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w getAnimeTitle()ΛΦʔόʔϥΠυ͢Δ
w ͠ͳ͍ͱίϯύΠϧΤϥʔ
.BOHB5JNF,JSBSB."9࣮
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* MangaTimeKiraraMAX.java
class MangaTimeKiraraMAX extends BaseMangaTimeKirara {
public MangaTimeKiraraMAX(String coverTitle,
int number) {
super("·Μ͕λΠϜ͖ΒΒMAX", coverTitle, number);
}
@Override
public String getInfoText() {
return “·Μ͕λΠϜ͖ΒΒ…" + …(ུ);
}
@Override
public String getAnimeTitle() {
return "εςϥͷ·΄͏";
}
}
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"CTUSBDUΫϥεΛҾʹ
public void printAnimeTitle(BaseMangaTimeKirara magazine) {
System.out.println( magazine.getAnimeTitle() );
}
// BaseMangaTimeKirara ͏ΦϒδΣΫτΛ࡞Ͱ͖ͳ͍
MangaTimeKiraraMAX max =
new MangaTimeKiraraMAX("͖Μ͍ΖϞβΠΫ" , 1);
printAnimeTitle(max);
௨ৗͷΫϥεͱಉ͡Α͏ʹϝιουΛݺΔ
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*OUFSGBDF
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*OUFSGBDF
w ΠϯλʔϑΣʔε
w நϝιουͱఆͷΈ
w ܕͱͯ͑͠ΔʢࣅͯΔ͕ΫϥεͰͳ͍ʣ
w ΦϒδΣΫτΛ࡞Ͱ͖ͳ͍
w ΠϯλʔϑΣʔεΛʮ࣮ JNQMFNFOU
͢Δʯ
ͱ͍͏
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*OUFSGBDFͱ
"CTUSBDU$MBTT
w "CTUSBDU$MBTTࢠؔ
w " ࢠ
JT#
w *OUFSGBDFೳྗతͳײ͡
w " Ϋϥε
DBO# ΠϯλʔϑΣʔε
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*OUFSGBDF
w ΠϯλʔϑΣʔεଟॏʹ࣮Մೳʢॏཁʣ
w ʮ͜ͷΫϥε͜͏͍͏ػೳΛ࣋ͪ·͢Αʯͱ͍
͏ҙຯ߹͍ͳͷͰ
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ྫ
w ࡶࢽΛϑΝΠϧʹग़ྗ͍ͨ͠
w ʮϑΝΠϧʹग़ྗͰ͖Δͭʯͱ͍͏*OUFSGBDF
Λ࡞Δ
• FileExpotable Λ࡞Δ
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* FileExportable.java
interface FileExportable {
public void export();
ʩ
'JMF&YQPSUBCMF࣮
interface Λఆٛ
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* FileExportable.java
interface FileExportable {
void export();
ʩ
'JMF&YQPSUBCMF࣮
ϝιουΛఆٛ (abstract ෆཁ)
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.BHB[JOF࣮
w MagazineʹFileExportableΛ࣮͢Δ
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class Magazine implements FileExportable {
protected String tit…
public Magazine(String titl…) {
this.title = ti…;
}
public String getInfoText() {
return co…
}
@Override
public void export() {
// export ॲཧΛॻ͘
}
}
FileExportable Λ implement ͢Δ
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class Magazine implements FileExportable {
protected String tit…
public Magazine(String titl…) {
this.title = ti…;
}
public String getInfoText() {
return co…
}
@Override
public void export() {
// export ॲཧΛॻ͘
}
}
export ϝιουΛ࣮͢Δ
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class Magazine implements FileExportable, Hoge, Piyo {
}
w *OUFSGBDFෳ࣮Մೳ
w “,”Ͱ۠ͬͯॻ͘
w ͦΕͧΕʹఆٛ͞ΕͨϝιουΛ࣮͢Δ
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w ܧঝͱ࣮ಉ࣌ʹߦ͑Δ
w ܧঝ࣮ؒͰϝιου໊͕ඃͬͯ0,
class BaseMangaTimeKirara extends ComicMagazine implements Foo {
}
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public void exportFile( FileExportable exportable ) {
exportable.export();
}
MangaTimeKiraraMAX max =
new MangaTimeKiraraMAX("͖Μ͍ΖϞβΠΫ" , 1);
exportFile(max);
ҾͷܕʹΠϯλʔϑΣʔεΛࢦఆ͢Δ
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public void exportFile( FileExportable exportable ) {
exportable.export();
}
MangaTimeKiraraMAX max =
new MangaTimeKiraraMAX("͖Μ͍ΖϞβΠΫ" , 1);
exportFile(max);
FileExportable Λ࣮͍ͯ͠ΔΫϥεͰݺͼग़͠
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ComicMagazine
Magazine
BaseMangaTimeKirara
MangaTimeKirara,
MangaTimeKiraraCarat,
MangaTimeKiraraMax, etc…
FileExportable
Hoge
Foo
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ܕม
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ܕม
w ϓϩάϥϜͷதͰมΛ
ͲͷΫϥεɾΠϯλʔϑΣʔεͱͯ͠ѻ͏͔
w มߋͯ͠ΦϒδΣΫτͷ࣮ମมΘΒͳ͍
ˠ ϝιουɾมͷ݁ՌมΘΒͳ͍
ʢݺͼग़ͤΔϝιουɾม͕มΘΔʣ
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ܕมͷछྨ
w ҉తܕม
w ࣗ໌ͳͷ
w উखʹͬͯ͘ΕΔ
w ໌ࣔతܕมʢΩϟετʣ
w ࣗ໌Ͱͳ͍ͷ
w ࣗͰ໌ࣔ͢Δඞཁ͕͋Δ
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ܕมͷྫ
w ΫϥεΛҾʹऔΔϝιουʹࢠΫϥεΛ
ೖΕΔ࣌ʹܕม͢Δʢ҉తʣ
w ܕม͢Δ͜ͱͰΫϥεʹͳ͍ࢠΫϥεͷ
ϝιουΛݺͼग़͢ʢ໌ࣔతʣ
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ComicMagazine
Magazine
BaseMangaTimeKirara
MangaTimeKirara,
MangaTimeKiraraCarat,
MangaTimeKiraraMax, etc…
FileExportable
Hoge
Foo
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҉తͳܕม
ComicMagazine
Magazine
Magazine magazine = new ComicMagazine(…);
ࢠ
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҉తͳܕม
FileExportable exportable = new Magazine(…);
ΠϯλʔϑΣʔε ࣮Ϋϥε
FileExportable Magazine
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҉తͳܕม
FileExportable exportable = new MangaTimeKirara(…);
ΠϯλʔϑΣʔε ࣮ΫϥεͷࢠΫϥεɹ
FileExportable MangaTimeKirara
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҉తͳܕม
ʢϓϦϛςΟϒܕʣ
ਫ਼ߴ͍ ਫ਼͍
long int
long longValue = 2;
ৄࡉ: http://www.atmarkit.co.jp/ait/articles/0803/18/news149.html
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ComicMagazine
Magazine
Magazine magazine = new ComicMagazine(…);
ComicMagazine comicMagazine = (ComicMagazine) magazine;
ࢠ
໌ࣔతͳܕมʢΩϟετʣ
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FileExportable exportable = new Magazine(…);
Magazine magazine = (Magazine) magazine;
ΠϯλʔϑΣʔε ࣮Ϋϥε
FileExportable Magazine
໌ࣔతͳܕมʢΩϟετʣ
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໌ࣔతͳܕม
ʢΩϟετ
ϓϦϛςΟϒܕʣ
ਫ਼ߴ͍ ਫ਼͍
long int
long longValue = 2;
int intValue = (int) longValue;
ৄࡉ: http://www.atmarkit.co.jp/ait/articles/0803/18/news149.html
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ଓ͖HJTUͰ
IUUQTHJTUHJUIVCDPNOPOZMFOF
FBGGFGBGDFFBC