1.Javaãšã¯
ããã°ã©ãã³ã°ãšã¯ãã³ã³ãã¥ãŒã¿ã«å¯ŸããŠç¹å®ã®åŠçããããããã®åœä»€ãæžãããšãæããŸããããã®åœä»€ãæžãããã®èšèªãšããŠæ§ã ãªçš®é¡ãååšããŸãããã®äžã§ãç¹ã«äžçäžã§åºã䜿ãããŠããã®ããJavaããšããããã°ã©ãã³ã°èšèªã§ãã
1.1 Javaã®å®çŸ©
Javaã¯ã1995幎ã«ç±³åœã®Sun Microsystems瀟ïŒçŸåšã¯Oracle瀟ãææïŒã«ããéçºãããããã°ã©ãã³ã°èšèªã§ãããäžåºŠæžãã°ãã©ãã§ãåãããã¢ãããŒã«äœãããŠãããæ§ã ãªããã€ã¹ãOSã§åäœããŸãã
1.2 Javaã®ç¹åŸŽ
Javaãéžã°ããçç±ã®äžã€ã«ãã®ç¹åŸŽããããŸããJavaã¯ãªããžã§ã¯ãæåãšãããçŸä»£ã®ãœãããŠã§ã¢éçºã®åºæ¬ãšãªãææ³ãå®å šã«åãå ¥ããŠããèšèªã§ãã
ãŸããJavaã¯ã€ã³ã¿ããªã¿ãšããä»çµã¿ãæ¡çšããŠãããããç°ãªãOSãããã€ã¹äžã§ãå ±éã®Javaã®ã³ãŒãïŒãã€ãã³ãŒããšããïŒãå®è¡ããããšãå¯èœã§ãããã®ç¹æ§ãããJavaã¯ã¢ãã€ã«ã¢ããªãçµã¿èŸŒã¿ã·ã¹ãã ã倧èŠæš¡ãªäŒæ¥ã®æ¥åã·ã¹ãã ãªã©å¹¹äºé åã§åºãå©çšãããŠããŸãã
ããã«Javaã«ã¯ããããã¯ãŒã¯ãã»ãã¥ãªãã£ãæ±ãæ©èœãå€æ°ã®äŸ¿å©ãªã©ã€ãã©ãªãæäŸãããŠããŸãããããã®ã©ã€ãã©ãªã掻çšããããšã§ãç ©éãªã³ãŒãã£ã³ã°ãå€§å¹ ã«è»œæžããããšãå¯èœãšãªã£ãŠããŸãã
1.3 Javaã®æŽå²
Javaã®éçºã¯1990幎代åé ã«å§ãŸããŸãããåœåã¯å®¶é»è£œåã«çµã¿èŸŒãããã®ããã°ã©ãã³ã°èšèªãšããŠéçºãããJavaã§ããããŠã§ãæè¡ã®çºå±ãšãšãã«ãŠã§ãã¢ããªã±ãŒã·ã§ã³éçºã®èšèªãšããŠæ³šç®ãããããã«ãªããŸããã
ãã®åŸããµãŒããŒãµã€ãã®éçºã«ã察å¿ããEnterpriseçã®æäŸéå§ããªãŒãã³ãœãŒã¹åãªã©ãçµãŠãçŸåšã§ã¯ãããããœãããŠã§ã¢éçºã«äœ¿ãããäžèœã®èšèªãšãªã£ãŠããŸãã
2.Javaã®åºæ¬æ§é
Javaã®åºæ¬æ§é ãç解ããããã«ã¯ããŸããã®ã³ãŒãã®æžãæ¹ã«ã€ããŠææ¡ããããšãå¿ èŠã§ãããããç解ããããšã§ãJavaã«ãããããŒã¿åãšå€æ°ãæŒç®åãšæ§æãå¶åŸ¡æ§é ã«ã€ããŠãç解ãæ·±ããããšãã§ããŸãã
2.1 ã³ãŒãã®æžãæ¹
Javaã®ã³ãŒãã¯ãã¯ã©ã¹ãšã¡ãœããã䜿çšããŠè¡šçŸãããŸããã¯ã©ã¹ã¯ãªããžã§ã¯ãæåããã°ã©ãã³ã°ã®äžå¿çãªæŠå¿µã§ãã¡ãœããã¯ãã®ã¯ã©ã¹ãæã€æ©èœãå®çŸ©ããŸããJavaã®ããã°ã©ã ã¯äž»ã«ãããã®ã¯ã©ã¹ãšã¡ãœããããæãç«ã¡ãŸãã
class MyClass { void myMethod() { System.out.println("Hello, Java!"); } }
ãã®ããã«ãJavaã®ã³ãŒãã¯åžžã«classãšããããŒã¯ãŒãã§å§ãŸãããã®åŸã«ã¯ã©ã¹åïŒãã®å Žåã¯MyClassïŒãç¶ããŸããã¡ãœããã¯ãã®ã¯ã©ã¹ã®äžã«å®çŸ©ãããŸãã
2.2 ããŒã¿åãšå€æ°
Javaã«ã¯ãæ å ±ãä¿åããããã®ç®±ãšããŠæ©èœããå€æ°ããããŸããå€æ°ã«ã¯ãä¿åããæ å ±ã®çš®é¡ã«å¿ããŠãæ§ã ãªããŒã¿åãååšããŸããäž»ãªããŒã¿åã«ã¯ãæŽæ°ãè¡šãintãå®æ°ãè¡šãdoubleãçåœå€ãè¡šãbooleanãªã©ããããŸãã
int myNumber = 10; double myDecimal = 3.14; boolean myBoolean = true;
äžèšã®ããã«ãå€æ°ã¯ããŒã¿åã®åŸã«å€æ°åãèšè¿°ãããã®åŸã«ã=ãæŒç®åã䜿çšããŠåæå€ãå²ãåœãŠãŸãã
2.3 æŒç®åãšæ§æ
Javaã§ã¯ãæ°å€ãæååãè«çå€ãªã©ã®æäœãè¡ãããã®æŒç®åãçšæãããŠããŸãããããã¯ãå ç®ãæžç®ãä¹ç®ãé€ç®ãªã©ã®ç®è¡æŒç®ãã¯ãããæ¡ä»¶æ¯èŒãè«çæŒç®ãªã©ãå¯èœã§ãã
int a = 10; int b = 20; int sum = a + b; // sum is now 30
ãŸããJavaã®æ§æäœç³»ã¯ãifæãforæãwhileæãšãã£ãå¶åŸ¡æ§é ãæã£ãŠããŸãããããã¯ãããã°ã©ã ã®æµããå¶åŸ¡ããããã®ãã®ã§ãã
2.4 å¶åŸ¡æ§é
Javaã®å¶åŸ¡æ§é ã«ã¯ãæ¡ä»¶åå²ãè¡šãifæãç¹°ãè¿ãåŠçãè¡šãforæãwhileæããããŸãããããã䜿ãããšã§ãç¹å®ã®æ¡ä»¶äžã§ã®ã¿åŠçãè¡ã£ãããåãåŠçãç¹°ãè¿ãããããããšãå¯èœã«ãªããŸãã
if (a > b) { System.out.println("a is greater than b"); } for (int i = 0; i < 10; i++) { System.out.println(i); }
äžèšã®äŸã§ã¯ãifæãçšããŠãaãbãã倧ããå Žåã«ãç¹å®ã®åŠçïŒããã§ã¯ã¡ãã»ãŒãžã®åºåïŒãè¡ã£ãŠããŸããforæã§ã¯ãç¹å®ã®åæ°ïŒããã§ã¯10åïŒã ãç¹°ãè¿ãåŠçãè¡ã£ãŠããŸãã
3.Javaã§ã®ããã°ã©ãã³ã°ææ³
ããã°ã©ãã³ã°ææ³ãšã¯ãç¹å®ã®åé¡ã解ãããã®ã³ãŒãã£ã³ã°ã®æ¹æ³ãæããŸããJavaã¯ãã®æè»æ§ãšãã¯ãã«ãªæ©èœã§ç¥ãããŠããŸããããã®æ ¹åºã«ã¯ããã€ãåºæ¬çãªããã°ã©ãã³ã°ææ³ãååšããŸããããã§ã¯ãJavaã§ãã䜿ããã3ã€ã®ããã°ã©ãã³ã°ææ³ããã¡ãœãããšã¯ã©ã¹ããããªããžã§ã¯ãæåããã°ã©ãã³ã°ããããšã©ãŒãã³ããªã³ã°ãã«ã€ããŠè§£èª¬ããŸãã
3.1 ã¡ãœãããšã¯ã©ã¹
ã¡ãœãããšã¯ãç¹å®ã®åäœãå®è¡ããäžé£ã®ã³ãŒããè¡šããJavaã§ã¯äžè¬çã«æäœãè¡šçŸããããã«äœ¿çšãããŸããã¡ãœããã¯äžé£ã®æé ãã«ãã»ã«åããåå©çšãšçµç¹åã«åœ¹ç«ã¡ãŸãã
äžæ¹ãã¯ã©ã¹ãšã¯ãªããžã§ã¯ããå®çŸ©ããããã®ãã³ãã¬ãŒããŸãã¯éåçã®ãããªãã®ã§ãå±æ§ïŒå€æ°ïŒãšã¡ãœããïŒé¢æ°ïŒãæã€ããšãã§ããŸããJavaã§ã¯ãã¯ã©ã¹ã䜿çšããŠç¹å®ã®ã¿ã€ãã®ãªããžã§ã¯ããè¡šçŸãããã®ã¿ã€ãã®å±æ§ãšåäœãå®çŸ©ããŸãã
3.2 ãªããžã§ã¯ãæåããã°ã©ãã³ã°
ãªããžã§ã¯ãæåããã°ã©ãã³ã°ïŒOOPïŒã¯ãJavaã®ã³ã¢æŠå¿µã§ããããã®ãã¶ã€ã³ååã¯Javaã®åãæ倧éã«åŒãåºããŸããOOPã¯ããªããžã§ã¯ããšããæŠå¿µãäžå¿ã«ããã°ã©ã ãæ§é åããŸããããã§ãããªããžã§ã¯ããšã¯ãç¶æ ïŒå±æ§ïŒãšåäœïŒã¡ãœããïŒãæã€ãšã³ãã£ãã£ã®ããšãæããŸãã
Javaã®ãªããžã§ã¯ãæåæ§ã¯ãããã°ã©ã ã®åå©çšæ§ãã¹ã±ãŒã©ããªãã£ãã¢ãžã¥ãŒã«æ§ã匷åãããœãããŠã§ã¢ã®éçºãšä¿å®ãå¹ççã«ããŸãã
3.3 ãšã©ãŒãã³ããªã³ã°
ããã°ã©ã ã¯ç°ãªãåå ã§åé¡ããšã©ãŒãèµ·ããããšããããŸããããããã®ãšã©ãŒãé©åã«æããŠåŠçããããšãéèŠã§ããJavaã§ã¯ãšã©ãŒãã³ããªã³ã°ã匷åãªããŒã«ãšããŠæäŸãããããã«ããéçºè ã¯ãšã©ãŒã®ç®¡çãšå¯ŸåŠãå¯èœãšãªããŸãã
Javaã®ãšã©ãŒãã³ããªã³ã°ã¯ãäŸå€ãšããä»çµã¿ãä»ããŠè¡ãããŸããäŸå€ãšã¯ãããã°ã©ã ã®æ£åžžãªãããŒãäžæããã€ãã³ãã§ããäŸå€ãé©åã«æããïŒãã£ããããïŒããšã§ããšã©ãŒãçºçãããšãã§ãããã°ã©ã ã®å®è¡ãç¶ããããšãå¯èœãšãªããŸãã
4.Javaã§ã®ãããžã§ã¯ã管ç
Javaã䜿çšããããã°ã©ãã³ã°äœæ¥ã¯ãæ©èœéçºã ãã§ã¯ãããŸãããã³ãŒãã®èšè¿°ã ãã§ã¯ãªããå¹ççãªéçºç°å¢ã®æ§ç¯ããã¡ã³ããŒãšã®å調äœæ¥ãåæã«èæ ®ããªããã°ãªããŸããããã®ã»ã¯ã·ã§ã³ã§ã¯ãJavaã§ã®ãããžã§ã¯ã管çã®åºæ¬çãªèŠç¹ã解説ããŸãã
4.1 IDEã®å©çš
Javaã®éçºãå¹çåããéèŠãªããŒã«ã®äžã€ã«ãçµ±åéçºç°å¢ïŒIDE: Integrated Development EnvironmentïŒããããŸããIDEã¯ãã³ãŒãã®èšè¿°ããããã°ããã«ããªã©ã®äœæ¥ãäžå åããããã®ããŒã«ã§ãã代衚çãªJavaåãIDEã«ã¯ãEclipseãIntelliJ IDEAãªã©ããããŸãã
Eclipseã¯ãéåžžã«å€æ©èœã§ããããã©ã°ã€ã³ã«ãã£ãŠããŸããŸãªè¿œå æ©èœãå°å ¥ã§ããŸããäžæ¹ãIntelliJ IDEAã¯ããã®äœ¿ãããããšå¹çæ§ã§ç¥ãããŠããã匷åãªãªãã¡ã¯ã¿ãªã³ã°æ©èœãæºèœçãªã³ãŒãè£å®æ©èœãç¹åŸŽçã§ãã
IDEã®äœ¿ãæ¹ã«æ £ãããšãã³ãŒãã®èšè¿°ãã¹ã ãŒãºã«ãªãããã°ã®ä¿®æ£ãæ©ããªããŸãããã®çµæãçæéã§è³ªã®é«ãããã°ã©ã ãäœæã§ããããã«ãªãã§ãããã
4.2 ãã«ãããŒã«ã®å©çš
Javaãããžã§ã¯ãã®ç®¡çã«ã¯ããã«ãããŒã«ãæ¬ ãããŸããããã«ãããŒã«ã¯ããœãŒã¹ã³ãŒãããå®è¡å¯èœãªããã°ã©ã ãäœæããäžé£ã®äœæ¥ïŒã³ã³ãã€ã«ããã¹ããããã±ãŒãžåãªã©ïŒãèªååããŸãã
Javaåãã®ãã«ãããŒã«ã«ã¯ãMavenãGradleãªã©ããããŸããMavenã¯ãããžã§ã¯ãã®ã©ã€ããµã€ã¯ã«ãå šäœçã«ç®¡çããGradleã¯ããã®æè»æ§ãšã¹ã¯ãªããã«ããã³ã³ãã£ã®ã¥ã¬ãŒã·ã§ã³ãç¹åŸŽçã§ãã
ãã«ãããŒã«ã䜿ãããšã§ãæåã§è€éãªãã«ãäœæ¥ãè¡ãå¿ èŠããªããªããéçºã®è¿ éåã«ã€ãªãããŸãã
4.3 ããŒãžã§ã³ç®¡çã·ã¹ãã ã®å©çš
ããŒã ã§éçºãè¡ãå Žåããäžäººã§éçºãããŠããŠããã³ãŒãã®å€æŽå±¥æŽã管çããããã«ã¯ããŒãžã§ã³ç®¡çã·ã¹ãã ãå¿ é ã§ããããŒãžã§ã³ç®¡çã·ã¹ãã ã¯ãã³ãŒãã®å€æŽå±¥æŽãèšé²ããç¹å®ã®ããŒãžã§ã³ãåãåºãçã®æ©èœãæäŸããŸãã
æãäžè¬çãªããŒãžã§ã³ç®¡çã·ã¹ãã ã¯Gitã§ããGitã䜿ããšãããŒãžã®æŠç¥ããã©ã³ãæŠç¥ã«ãããè€æ°äººã§ã®éçºäœæ¥ãå¹æçã«ç®¡çããããšãã§ããŸãããŸããGitHubãGitLabãªã©ã®ãªã¢ãŒããªããžããªãµãŒãã¹ãšé£æºããã°ããããžã§ã¯ãã®å ±æãããã¯ã¢ããã容æã«ãªããŸãã
以äžã®ããŒã«ãé§äœ¿ããŠãJavaã®ãããžã§ã¯ã管çãè¡ãããšã§ããã€ã¯ãªãªãã£ãªãããã¯ãã®éçºãå¯èœãšãªããããŒã å šäœã®ãããã¯ãã£ããã£ãåäžãããããªããŸãã
5.Javaã§ã®ããŒã¿æäœ
Javaã®ããã°ã©ãã³ã°ã§ã¯ãããŸããŸãªããŒã¿ãæ±ããŸããããŒã¿ã®çš®é¡ã«ãã£ãŠäœ¿ãããŒã«ãå€ãããŸãã®ã§ãããã§ã¯ä»£è¡šçãª3ã€ã®ããŒã¿æäœãé åãšéåã®æäœããã¡ã€ã«æäœãããŒã¿ããŒã¹æäœã«ã€ããŠã¿ãŠã¿ãŸãããã
5.1 é åãšéå
Javaã§ãã䜿ãããããŒã¿æ§é ã«é åãšéåããããŸããé åã¯ãåãããŒã¿åã®èŠçŽ ãé åºä»ããŠæ ŒçŽããŸããäžæ¹ãéåã¯åãåã®èŠçŽ ãéè€ãªãæ ŒçŽããŸãã
Javaã§ã¯ãé åãå®çŸ©ããã«ã¯æ¬¡ã®ããã«ããŸãã
int[] array = new int[5]; // intåã®é åãå®çŸ©
éåã¯Javaã®ã³ã¬ã¯ã·ã§ã³ãã¬ãŒã ã¯ãŒã¯ã«å±ããŠãããHashSetãTreeSetçã®ã¯ã©ã¹ãçšæãããŠããŸãã
Set<Integer> = new HashSet<>(); // Integeråã®HashSetãå®çŸ©
5.2 ãã¡ã€ã«æäœ
Javaã«ã¯java.ioããã±ãŒãžãšjava.nio.fileããã±ãŒãžãæäŸãããŠããŸãããããã®ããã±ãŒãžã«ã¯ããã¡ã€ã«ã®èªã¿æžããè¡ãããã®å€ãã®ã¯ã©ã¹ãå«ãŸããŠããŸããäŸãã°ãããã¹ããã¡ã€ã«ã®èªã¿åããè¡ãå Žåã«ã¯ãFileReaderã¯ã©ã¹ãBufferedReaderã¯ã©ã¹ã䜿ãããŸãã
以äžã«ãã¡ã€ã«ã®èªã¿èŸŒã¿ã®ç°¡åãªäŸã瀺ããŸãã
FileReader fr = new FileReader("test.txt"); BufferedReader br = new BufferedReader(fr); String line; while ((line = br.readLine()) != null) { System.out.println(line); } br.close();
5.3 ããŒã¿ããŒã¹æäœ
ããŒã¿ããŒã¹æäœã¯Javaã§ã®æšæºçãªããŒã¿ã®ç®¡çæ¹æ³ã§ããJavaã§ã¯JDBC(Java Database Connectivity)ãšããAPIãæäŸãããŠãããããã䜿ã£ãŠããŒã¿ããŒã¹ãžã¢ã¯ã»ã¹ã§ããŸãã
以äžã«ç°¡åãªããŒã¿ããŒã¹æ¥ç¶ãšã¯ãšãªã®å®è¡äŸã瀺ããŸãã
Connection con = DriverManager.getConnection("jdbc:mysql://localhost/testdb", "user", "password"); Statement st = con.createStatement(); ResultSet rs = st.executeQuery("SELECT * FROM users"); while (rs.next()) { System.out.println(rs.getString("name")); } rs.close(); st.close(); con.close();
ãã®ããã«Javaã§ã¯æ§ã ãªããŒã¿æäœãå¯èœã§ããããã®äžã§ãé åãéåã®æäœããã¡ã€ã«æäœãããŒã¿ããŒã¹æäœã¯ç¹ã«é »ç¹ã«äœ¿çšãããŸãã
6.Javaã©ã€ãã©ãª
JavaãåŠãã§ãããšé¿ããŠã¯éããªããã®ã«ãJavaã©ã€ãã©ãªããããŸããã©ã€ãã©ãªãšã¯ãåå©çšå¯èœãªã³ãŒãã®éåã§ããããã掻çšããããšã§éçºã®å¹çåãå¯èœãšãªããŸããããã§ã¯ãJavaã«ååšããã©ã€ãã©ãªã®äžã§ãã”ã¹ã¿ã³ããŒããªã©ã€ãã©ãª”ãš”ãªãŒãã³ãœãŒã¹ã©ã€ãã©ãª”ã®2ã€ã«çŠç¹ãåœãŠãŠè§£èª¬ããŠãããŸãã
6.1 ã¹ã¿ã³ããŒããªã©ã€ãã©ãª
ã¹ã¿ã³ããŒããªã©ã€ãã©ãªãšã¯ãJavaéçºããã(JDK)ã«å梱ãããŠããã©ã€ãã©ãªã®ããšãæããŸãããããã¯Javaãã€ã³ã¹ããŒã«ãããšããã«å©çšã§ããŸãã
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ArrayList
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6.2 ãªãŒãã³ãœãŒã¹ã©ã€ãã©ãª
次ã«ããªãŒãã³ãœãŒã¹ã©ã€ãã©ãªã«ã€ããŠèª¬æããŸãããªãŒãã³ãœãŒã¹ã©ã€ãã©ãªã¯ã誰ã§ãèªç±ã«å©çšããããæ¹å€ããããåé åžãããã§ãããœãããŠã§ã¢ã®åœ¢æ ã§ããã®ãœãŒã¹ã³ãŒããå ¬éãããŠããŸãããããã¯JDKã«å«ãŸããŠããªãç¹å®ã®æ©èœãæäŸããããã«äœãããéçºè ã®æéãçãããšãã§ããŸãã
代衚çãªãã®ã«ã¯ãããŒã¿ããŒã¹æäœãè¡ãããããããHibernateãããWebã¢ããªã±ãŒã·ã§ã³éçºãæ¯æŽãããSpring Frameworkããªã©ããããŸãããããã®ã©ã€ãã©ãªã掻çšããäºã§ãã³ãŒãã£ã³ã°ã®å¹çåããæ¢åã®ãœãããŠã§ã¢ãšã®äºææ§ç¢ºä¿ãªã©ã®é¢ã§å€§ããªã¡ãªããã享åã§ããŸãã
Javaã®ã©ã€ãã©ãªã¯åºç¯å²ã«ããããããããã§çŽ¹ä»ãããã®ä»¥å€ã«ãæ°å€ãååšããŸããå¿ èŠã«å¿ããŠãé©åãªã©ã€ãã©ãªãéžãã§å©çšããããšãéèŠã§ãã
7.Javaã§ã®Webã·ã¹ãã éçº
ããã§ã¯ãJavaã§ã®Webã·ã¹ãã éçºã®åºæ¬ãšãªãæè¡ãèãæ¹ã«ã€ããŠçŽ¹ä»ããŸããå ·äœçã«ã¯ããServletãšJSPãããMVCãã¬ãŒã ã¯ãŒã¯ãã«ã€ããŠè§£èª¬ããŸãã
7.1 ServletãšJSP
ãŸãã¯ãJavaã®åºæ¬çãªWebã·ã¹ãã éçºæè¡ã§ããServletãšJSPã«ã€ããŠèª¬æããŸãã
Servletã¯ãJavaã§Webã¢ããªã±ãŒã·ã§ã³ãäœãããã®APIã§ãHTTPãããã³ã«ã§ãªã¯ãšã¹ããåãåããã¬ã¹ãã³ã¹ãè¿ãããšãã§ããŸããServletã«ãããç¶æ³ã«å¿ããåçãªHTMLããŒãžãçæããŠã¯ã©ã€ã¢ã³ãã«éä¿¡ããããšãå¯èœãšãªããŸãã
äžæ¹ãJSPïŒJava Server PagesïŒã¯ãHTMLã®äžã«Javaã®ã³ãŒããåã蟌ãã§åçãªWebããŒãžãäœãããã®æè¡ã§ããäžè¬ã«ãServletã¯ããžãã¯éšåïŒèšç®ãDBæäœãªã©ïŒãæ åœããJSPã¯ãã¬ãŒã³ããŒã·ã§ã³ããžãã¯ïŒåºåã®åœ¢åŒãã¬ã€ã¢ãŠããªã©ïŒãæ åœããŸãã
äŸ: ã»Servlet if(username != null){ // ãŠãŒã¶ãŒã«é¢ããããŒã¿ãåãåºã } ã»JSP <html> <body> <h1>Hello, <%= username %></h1> </body> </html>
7.2 MVCãã¬ãŒã ã¯ãŒã¯
次ã«ãWebã·ã¹ãã éçºã«ãããŠããçšããããèšèšãã¿ãŒã³ã§ããMVCãã¬ãŒã ã¯ãŒã¯ã«ã€ããŠèª¬æããŸãã
MVCãã¬ãŒã ã¯ãŒã¯ã¯ãã¢ããªã±ãŒã·ã§ã³ããModelããViewããControllerãã®3ã€ã®éšåã«åããèšèšãã¿ãŒã³ã§ããããã«ããããœãããŠã§ã¢ã®éçºãšã¡ã³ããã³ã¹ããã容æã«ãªããŸãã
ãModelãã¯ããŒã¿ã®åŠçãšããžãã¹ããžãã¯ãããViewãã¯ããŒã¿ã®è¡šç€ºãããControllerãã¯ãŠãŒã¶ãŒã®å ¥åãšã¢ããªã±ãŒã·ã§ã³ã®ãããŒå¶åŸ¡ãæ åœããŸãã
Javaã®ä»£è¡šçãªMVCãã¬ãŒã ã¯ãŒã¯ã«ã¯ããSpring MVCãããStrutsããªã©ããããŸãããããã®ãã¬ãŒã ã¯ãŒã¯ãå©çšããããšã§ãéçºå¹çã®åäžãå質ã®ç¢ºä¿ãå¯èœãšãªããŸãã
以äžãJavaã§ã®Webã·ã¹ãã éçºã®åºæ¬ã«ãªããŸãããServletãšJSPãã§WebããŒãžãåçã«çæãããMVCãã¬ãŒã ã¯ãŒã¯ãã§ã¢ããªã±ãŒã·ã§ã³èšèšãè¡ããšããæµãã¯ãJavaãçšããWebã·ã¹ãã éçºã«ãããŠåºæ¬ãšãªã芳念ã§ãã
8.Javaã®èªå®è³æ Œ
Javaããã°ã©ãã³ã°ã®ã¹ãã«ã蚌æããäžã€ã®æ¹æ³ãšããŠãåçš®ã®èªå®è³æ ŒããããŸãããããã®èªå®è³æ Œã¯ãæè¡è ãšããŠã®ã¬ãã«ãå ¬çã«èšŒæããããã®ãã®ã§ãå°±è·ãæé²ã®éã«ãæå©ã«åãããšããããŸãã以äžã§ã¯ãäž»ãªJavaã®èªå®è³æ Œã«ã€ããŠè©³ããèŠãŠãããŸãããã
8.1 Oracle Certified Java Programmer
Oracle Certified Java Programmer (OCJP)ã¯ãJavaæè¡è ãšããŠæãäžè¬çã«èªç¥ãããŠããè³æ Œã®äžã€ã§ãJavaã®åºæ¬çãªç¥èãšã¹ãã«ã蚌æããŸãããã®è³æ Œã¯ãåçŽããäžçŽãŸã§ã®æ§ã ãªã¬ãã«ããããããããã®è©Šéšã§æ±ããããç¥èãæèœã¬ãã«ãç°ãªããŸããè©Šéšå 容ã¯ãJavaã®åºæ¬çãªææ³ãAPIã®å©çšããªããžã§ã¯ãæåããã°ã©ãã³ã°ã®ç解ãäŸå€åŠçãªã©ãå«ãŸããŸãããããæã£ãŠããããšã¯ãJavaã§ã®ããã°ã©ãã³ã°èœåãäžå®ã®æ°Žæºã«éããŠããããšã蚌æãããããä»äºãæ¢ããŠããå Žåãã¹ãã«ã¢ãããå³ãããå Žåã«ããããã§ãã
8.2 Spring Professional Certification
Spring Professional Certificationã¯ãSpring Frameworkã«é¢ããæ·±ãç解ãšé«åºŠãªã¹ãã«ã蚌æããèªå®è³æ Œã§ããSpring Frameworkã¯ãäŒæ¥ã¬ãã«ã®Javaã¢ããªã±ãŒã·ã§ã³ãå¹ççã«éçºããããã®ãã¬ãŒã ã¯ãŒã¯ã§ãããç¹ã«Webã¢ããªã±ãŒã·ã§ã³éçºã«ãããŠåºãæ¡çšãããŠããŸãããã®è³æ ŒãååŸããããã«ã¯ãSpring Frameworkã®ã³ã¢æ©èœã«ã€ããŠã®ç解ãã¯ãããããŒã¿ã¢ã¯ã»ã¹ããã©ã³ã¶ã¯ã·ã§ã³ç®¡çãã»ãã¥ãªãã£åŠçãRESTfulãµãŒãã¹ã®èšèšãšéçºãªã©ãããŸããŸãªé åã®ç¥èãšã¹ãã«ãæ±ããããŸãã
8.3 IBM Certified Solution Developer
ãããŠæåŸã«ãIBM Certified Solution Developerãšããèªå®è³æ ŒããããŸãããã®è³æ Œã¯IBMãæäŸãããšã³ã¿ãŒãã©ã€ãºã¬ãã«ã®Javaãœãªã¥ãŒã·ã§ã³ã®èšèšãšéçºã«é¢ããç¥èãšã¹ãã«ã蚌æããŸããç¹ã«ãWebSphere Application ServerãçšããJavaã¢ããªã±ãŒã·ã§ã³ã®éçºã«é¢ããç¥èãæ±ããããŸãããã®è³æ ŒãååŸããããšã§ã倧èŠæš¡ãã€é«åºŠãªJavaã·ã¹ãã ã®éçºèœåã蚌æã§ããããããšã³ã¿ãŒãã©ã€ãºç°å¢ã§ã®éçºçµéšãç©ã¿ãããšèããŠããæ¹ã«åããŠããŸãã
以äžããJavaæè¡è ãšããŠèº«ã«ã€ããããšãæšå¥šãããäž»ãªèªå®è³æ Œã§ãããããã®è³æ ŒãååŸããããšã«ãããJavaããã°ã©ãã³ã°ã®ã¹ãã«ãšçµéšã蚌æããããé«åºŠãªãããžã§ã¯ãã«åå ããããã®ä¿¡é Œãç²åŸããããšãã§ããŸãã
9.Javaã®å°æ¥æ§
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9.1 JavaãšAI
çŸä»£ã§ã¯AIæè¡ãæ¥éã«çºå±ããŠãããæ§ã ãªåéã§æŽ»çšãããŠããŸããJavaã§ããAIéçºåãã®ãã¬ãŒã ã¯ãŒã¯ãã©ã€ãã©ãªãååšããããçãæéã§é«å質ãªAIã·ã¹ãã ãæ§ç¯å¯èœã«ãªã£ãŠããŸãã
TensorFlowãDeep Java Libraryãªã©ã®ã©ã€ãã©ãªãå©çšããã°ãJavaã§æ©æ¢°åŠç¿ã®ã¢ãã«ãäœæããããæ¢åã®ã¢ãã«ãå©çšããããšãå¯èœã§ããããã«ãããæ©æ¢°åŠç¿ã深局åŠç¿ãJavaã§å®æœããããšã§AIã®ãšãã¹ããŒããšå ±ã«æ°ããªäŸ¡å€ãçã¿åºãããšãååã«èããããŸãã
9.2 Javaãšã¯ã©ãŠãã³ã³ãã¥ãŒãã£ã³ã°
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Javaã«ã¯J2EEãšãããšã³ã¿ãŒãã©ã€ãºã·ã¹ãã åãã®ãã¬ãŒã ã¯ãŒã¯ãååšããã¯ã©ãŠãäžã§ã®åæ£ã¢ããªã±ãŒã·ã§ã³éçºã«é©ããŠããŸãããŸããGoogle Cloud PlatformãAmazon Web ServicesïŒAWSïŒãMicrosoft Azureãªã©ãå€ãã®ã¯ã©ãŠããããã€ãã§ã¯Javaã®å©çšãå¯èœã§ãã
9.3 JavaãšIoT
è¿å¹ŽãIoTïŒInternet of ThingsïŒã¯æ¥éã«æ®åããæã ã®ç掻ã«å€§ããªåœ±é¿ãäžãã€ã€ãããŸããJavaããŸããããããIoTæ©åšã®äžæ žã§åäœããããã°ã©ãã³ã°èšèªã®äžã€ãšãªã£ãŠããŸãã
Javaã¯ãã©ãããã©ãŒã ã«äŸåããªããããå€çš®å€æ§ãªIoTããã€ã¹ã§åäœããããšãå¯èœã§ãããŸããJavaãæã€è±å¯ãªAPI矀ãšã©ã€ãã©ãªã«ãããã»ã³ãµãŒããŒã¿ã®åéã»è§£æããéä¿¡ãŸã§ãIoTã·ã¹ãã ãæ©èœçã«ç°¡åã«éçºããããšãã§ããŸãã
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10.ãŸãšã
ãã®çµç€ã«ããããããŸãããæã ã¯Javaã®åŠç¿ã«ã€ããŠãã®æ¬è³ªãã€ããã ç解ãæ·±ããããšãã§ããŸãããããããããã§æ¹ããŠãã®éèŠæ§ã匷調ããããã«ãJavaåŠç¿ã®ã¡ãªãããå ·äœçãªåŠç¿ã¹ãããããµãè¿ããšãšãã«ãäžèšã§ãŸãšããŠãããããšæããŸãã
10.1 JavaåŠç¿ã®ã¡ãªãã
Javaèšèªã®åŠç¿ã¯ãå¹ åºãããã°ã©ãã³ã°éçºã«å¯Ÿå¿ã§ããã¹ãã«ã身ã«ã€ããããšãã§ããŸããJavaã¯æ¥çæšæºã®ããã°ã©ãã³ã°èšèªã®ïŒã€ã§ãããWebã·ã¹ãã ãããšã³ã¿ãŒãã©ã€ãºã·ã¹ãã ãããã«ã¯çµã¿èŸŒã¿ã·ã¹ãã ãŸã§ãéçºé åããšãŠãåºç¯ã«ããããŸãããŸããè±å¯ãªã©ã€ãã©ãªãšãã¬ãŒã ã¯ãŒã¯ããããé »ç¹ã«æŽæ°ããç¶ããŠããŸãã®ã§ãJavaãåŠã¶äºã¯çŸåšé²è¡åœ¢ã®æè¡ãè¿œæ±ããããã®éãšãèšããŸãã
10.2 JavaåŠç¿ã®ã¹ããã
JavaåŠç¿ã®ã¹ãããã¯ããŸãã¯åºæ¬çãªææ³ã次ã«ãªããžã§ã¯ãæåã®ç解ããããŠã©ã€ãã©ãªããã¬ãŒã ã¯ãŒã¯ã®æŽ»çšãšããæµããåºæ¬çã«ã¯ãã©ããŸããããããã®ã¹ãããã¯åã®ã¹ãããã®ç解ãæ·±ãã次ã®ã¹ããããžã®æºåãæŽããããã®ãã®ã§ãããŸããèªå·±åŠç¿ã ãã§ãªããå®è·µçãªããã°ã©ãã³ã°çµéšãç©ãããšãéèŠã§ãããããã®åŠç¿ã¹ãããã¯ãããªããæåã®Javaãšã³ãžãã¢ã«ãªãããã®éããã¹ãšãªãã§ãããã
10.3 æåŸã«
ãããŠãäœãããå¿ããŠã¯ãªããªãã®ãæç¶çãªåŠç¿ã§ãããã¯ãããžãŒã¯æ¥ã é²åããŠãããããã«é©å¿ããããšãæ±ããããŸããJavaããŸãé²åãç¶ããŠããŸããããéå»ã®ç¥èã ãã§çŸåšãåãæããããšããããšã¯æ±ºããŠé©åã§ã¯ãããŸãããæ ã«ãäžåºŠåŠãã ãããšãã£ãŠãã®ç¥èãæ°žé ã«æå¹ã§ãããšã¯éãããæã«ã¯æ°ããªç¥èãåŠã³çŽãããšãæ±ããããŸããããããããã«ã¯æ°ããçºèŠãæé·ã®ãã£ã³ã¹ãè©°ãŸã£ãŠãããããããŸãæ°ããªéãåãéãå¯èœæ§ãç§ããŠããŸãã