Why is the subject of the story about Java support JDK?

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1. ͳΜͰJDKͰ࿩͢Δͷ 2018/12/26 @saikou9901
2. ஫ҙ • Java EE͸ؾʹͯ͠·ͤΜ • ॳ৺ऀ޲͚ͳͷͰʮ͜Ε͸େମ͜ΕͰ͢ʯΈ ͍ͨͳॻ͖ͿΓʹͳΓ·͢
3. આ໌͢Δॱ൪ • Java • Java SE • JDK • JRE(+JVM)
4. Java • WikipediaΑΓ +BWBʢδϟόʣ͸ɺίϯϐϡʔλʔʹ͓͍ͯɺڱٛͰ͸ ϓϩάϥϛϯάݴޠ+BWBΛࢦ͢ɻ޿ٛͰ͸ݴޠ࢓༷Ҏ֎ ʹ΋ɺ࢓༷͕༩͑ΒΕ͍ͯΔ+BWBΫϥεϥΠϒϥϦ΍ +BWBԾ૝Ϛγϯɺ͞Βʹ͸+%,΍+3&ͳͲͷެࣜͷ΋ͷ Λ͸͡Ίͱ͢Δɺ৔߹ʹΑͬͯ͸αʔυύʔςΟͷ΋ͷ ͳͲΛؚΊᐆດʹ+BWBϓϥοτϑΥʔϜͱ૯শ͞ΕΔΑ ͏ͳ΋ͷͳͲͷΤίγεςϜͳͲΛࢦ͢͜ͱ΋͋Δɻ
5. Java • ʮJava΍ͬͯΔͷʁʯ • ʮ͋ͳͨͷࢦ͢Javaͱ͸ʁJavaͱ͸JDKͱ JVMͱ͍͏࣮ଶͷ͜ͱ͔ͦΕͱ΋ਓͷ໨ʹݟ ͑Δจ໘͔ͦΕͱ΋30ԯͷd • ʮ”Java΍ͬͯΔ”Ͱ͍͍͡ΌΜʂʯ
6. Java • ʮJava΍ͬͯΔͷʁʯ • ʮ͋ͳͨͷࢦ͢Javaͱ͸ʁJavaͱ͸JDKͱ JVMͱ͍͏࣮ଶͷ͜ͱ͔ͦΕͱ΋ਓͷ໨ʹݟ ͑Δจ໘͔ͦΕͱ΋30ԯͷd • ʮ”Java΍ͬͯΔ”Ͱ͍͍͡ΌΜʂʯ ޿ٛͷJava
7. Java public class HelloWorld { public static void main(String[] args) { System.out.println("Hello World!"); } } • ͜ΜͳงғؾʹͳΔΑʹڱٛͷJava
8. Java public class HelloWorld { public static void main(String[] args) { System.out.println("Hello World!"); } } • ͜ΜͳงғؾʹͳΔΑʹڱٛͷJava งғؾʁ
9. Java List<Record> records = hoge.query(); for (Record str: records) { ... } • ۩ମతͳจ๏͸ʮJava SEʯͰܾ·Δ͔Β ͜ͷfor͸”Java SE 5” Ҏ্Ͱͳ͍ͱಈ࡞͠ͳ͍
10. Java SE • ඪ४ϥΠϒϥϦͷ”࢓༷” • ৽͍͠จ๏
11. Java SE • ඪ४ϥΠϒϥϦͷ”࢓༷”
12. Java SE • ඪ४ϥΠϒϥϦͷ”࢓༷” ໊લͱ”΍Δ͜ͱ”͔͠ॻ͍ͯͳ͍ ʹJavaͷ࢓༷ॻ
13. Java SE • ৽͍͠จ๏ (String value) -> { System.out.println("value: " + value); }
14. Java SE • ৽͍͠จ๏ (String value) -> { System.out.println("value: " + value); } @FunctionalInterface Consumer<String> consumer = new Consumer<String>() { public void accept(String t) { System.out.println("value: " + t); } }; ※ద౰ͳͷͰؒҧͬͯͨΒ͢Έ·ͤΜ
15. Java SE • ৽͍͠จ๏ (String value) -> { System.out.println("value: " + value); } @FunctionalInterface Consumer<String> consumer = new Consumer<String>() { public void accept(String t) { System.out.println("value: " + t); } }; ※ద౰ͳͷͰؒҧͬͯͨΒ͢Έ·ͤΜ จ๏͸৽͍͠ΫϥεͳͲΛ׆༻ ͯ͠ղऍɾ࣮ߦ͞ΕΔ => Java SEʹґଘ͢Δ
16. ͓·͚ɿ࢓༷͸୭͕ܾΊΔʁ • ར֐ؔ܎ͳ͘ΈΜͳͰܾΊΔ ࢀߟɿ https://tech.pjin.jp/blog/ 2017/11/08/%E7%9F%A5%E3%81%A3%E3%81%A6%E3%81%8A%E3%81%8D%E3%81 %9F%E3%81%84%EF%BC%81java%E3%81%AE%E4%BB%95%E6%A7%98%E3%81%A3% E3%81%A6%E3%81%A9%E3%81%86%E3%82%84%E3%81%A3%E3%81%A6%E6%B1%B A%E3%81%BE%E3%82%8B/ ίϛϡχςΟͷγχΞϝϯόʔ͕࢓༷૲Ҋ Ұൠެ։ϨϏϡʔɾίϝϯτ ࣥߦҕһձʢOracle,IBM,RedHatͳͲʣ͕ঝೝ
17. ͓·͚ɿJava EE • SEͱಉ͘͡”࢓༷” • Servlet΍EJBͳͲɺSEΑΓଟ͘ͷػೳ • “Jakarta EE”ʹ໊લมΘΓ·ͨ͠ • ͏ͪͰ͸ͦΜͳ࢖Θͳ͍͔΋
18. JDK • JavaSEͷ࢓༷Λ࣮ࡍʹ࣮૷ͨ͠΋ͷ
19. JDK • JavaSEͷ࢓༷Λ࣮ࡍʹ࣮૷ͨ͠΋ͷ public final class String implements java.io.Serializable, Comparable<String>, CharSequence { ... public String() { this.value = "".value; this.coder = "".coder; } ... https://github.com/AdoptOpenJDK/openjdk-jdk11/blob/master/src/java.base/share/classes/java/lang/String.java
20. JDK • JavaSEͷ࢓༷Λ࣮ࡍʹ࣮૷ͨ͠΋ͷ public final class String implements java.io.Serializable, Comparable<String>, CharSequence { ... public String() { this.value = "".value; this.coder = "".coder; } ... https://github.com/AdoptOpenJDK/openjdk-jdk11/blob/master/src/java.base/share/classes/java/lang/String.java ͜͜ʹ੡඼Ձ஋͕͋Δʂ
21. JDK • JavaSEͷ࢓༷Λ࣮ࡍʹ࣮૷ͨ͠΋ͷ public final class String implements java.io.Serializable, Comparable<String>, CharSequence { ... public String() { this.value = "".value; this.coder = "".coder; } ... https://github.com/AdoptOpenJDK/openjdk-jdk11/blob/master/src/java.base/share/classes/java/lang/String.java ͜͜ʹ੡඼Ձ஋͕͋Δʂ
22. JDK • ࢓༷ެ։ͱಉ࣌ʹྫͱͯ͠࡞੒͞ΕΔ࣮૷ɹ ʹࢀর࣮૷ • ࠷ۙͷJava SEͷࢀর࣮૷͸ʮOpenJDKʯ public final class String implements java.io.Serializable, Comparable<String>, CharSequence { ... public String() { this.value = "".value; this.coder = "".coder; } ... https://github.com/AdoptOpenJDK/openjdk-jdk11/blob/master/src/java.base/share/classes/java/lang/String.java Φʔϓϯιʔε
23. JRE(+JVM) • ࣮ࡍʹॻ͍ͨJavaʢclassϑΝΠϧʣΛ࣮ߦ͢ Δͷʹඞཁͳ΋ͷ • ࣍ͷ΋ͷΛ಺แ͢Δ • ඪ४ϥΠϒϥϦͷclassϑΝΠϧʢJDKʣ • classϑΝΠϧͰOSʹࢦࣔΛ͢ΔʢJVMʣ
24. JRE(+JVM) JDK JVM • ͍͍ͩͨ͜Μͳ͔Μ͡ JRE
25. JRE(+JVM) JDK JVM • ͍͍ͩͨ͜Μͳ͔Μ͡ JRE ൣғ֎ɿ ίϯύΠϥͱ͔
26. JRE(+JVM) JDK JVM • ͍͍ͩͨ͜Μͳ͔Μ͡ JRE͸ JDKͷൣғ಺ʂ
27. ͳΜͰJDKͰ࿩͢Δͷ • Javaɿ;͍Μ͖ • Java SEɿΦʔϓϯͳ࢓༷ॻ • JDKɿJava SEͷ࣮૷ • JRE(+JVM)ɿJDKͷ͏࣮ͪߦʹඞཁͳ෦෼
28. ͳΜͰJDKͰ࿩͢Δͷ • Javaɿ;͍Μ͖ • Java SEɿΦʔϓϯͳ࢓༷ॻ • JDKɿJava SEͷ࣮૷ • JRE(+JVM)ɿJDKͷ͏࣮ͪߦʹඞཁͳ෦෼ ݖརࠫଡ͕ൃੜ͢Δͷ ͸͜͜ʂ
29. ͳΜͰJDKͰ࿩͢Δͷ 2018/12/26 @saikou9901