ããã«ã¡ã¯ãã¿ããªïŒæ°ããè·å Žã§ã®è©Šçšæéãçµäºããããããèªåã®è·æŽãå
±æã§ããããã«ãªããŸãããç§ã¯ 22 æ³ã§ãçµæžæè²ãåããŠããŸããã¡ããã© 1 幎å (2 æãã 3 æ)ãç§ã«ã¯ããã°ã©ãã³ã°ã®ã¹ãã«ããŸã£ãããªããJava ã«åºäŒã£ãã®ã¯å€ã Siemens ã®ã²ãŒã (ã²ãŒã éå§æã«ãpowered by JavaããšãããŠã§ã«ã«ã ãŠã£ã³ããŠã®åœ¢åŒ) ã§ã®ã¿ã§ããã 1 幎åãç§ã¯ãã¯ãã«ã« ãµããŒãéšéã§åããŠããŸãããäœåãæªããšã奜ãã§ã¯ãªããšã¯èšããŸããããç¹å¥é¢çœããšããããã§ããããŸããããããŠãããæç¹ã§ç§ã¯ããããŸã£ãããŸãåããããšããæ°æã¡ã§è¡ãã®ã§ã¯ãªããåã³ãããããä»äºãã§ãããããã®ã«ããšæã£ãŠããããšãåãããŸãããç§ã¯èããŸãããããšãã°ãå¿
ããããéã皌ãå¿
èŠããªããããããããšãäœã§ãã§ãã 1 幎éããã£ããšããããç§ã¯äœãããã§ãããã? çãã¯ã©ããããããèªç¶ã«èŠã€ãããŸãããç§ã¯å®¶ã§åº§ã£ãŠããã°ã©ãã³ã°ãåŠã¶ã§ãããããããããããã¯èªå次第ã ãšæ±ºå¿ããŸãããããã°ã©ãã³ã°ããŒãããåŠã¶ã®ã¯é£ããããšããããç§ã®ãã£ãªã¢ã«ãããŠäžæçãªæ«æã«ââãªãã ãããšããããšã¯ç解ããŠããŸãããïŒãžã¥ãã¢éçºè
ã®å ±é
¬ã¯ãã®ä»äºã§åŸãåå
¥ãããå°ãªãããšã«çãã®äœå°ã¯ãããŸããã§ããïŒããããäžæ©éãããšèããŸããã 2æ©åé²ããããã«ãããããŸãããåŠãèšãã»ã©ãªããç§ã¯ããã°ã©ãã³ã°èšèªã«ã€ããŠãŸã£ããç解ããŠããªãã£ãã®ã§ãæåã«èããã®ã¯ãæãããèããèšèª (å€åããŠããäŒç€Ÿã§ãœãããŠã§ã¢éçºã«äœ¿çšãããŠããèšèª)ãPHP ãå匷ããããšã§ãããããããŸããã女ã®åãç§ã«ããããããããŸããã圌女ã¯ã圌ãã®äŒç€Ÿ (ã¢ãã€ã« ã¢ããªã±ãŒã·ã§ã³ãéçºããŠãã) ã§ã¯ã¢ã³ããã€ãè·äººã Java ã§æžããŠããã圌ãã®çµŠæã¯è¯ãããã ãšç€ºåããŸãããã°ã°ã£ãŠã°ã°ã£ãŠèããŠãJava ãåŠã¶ããšã«ããŸãããç§ã®æåã®ã¹ãããã¯ãäœãæ°ããããšãåŠãŒããšããäŒçµ±çãªè©Šã¿ã§ãããæ¬ã§æŠè£
ããçè«ããã¹ã¿ãŒããŠãããå§ããŸããã! ãããç§ã Horstmann ãš Cornell ã®æ¬ãJavaããæã«å
¥ããæ¹æ³ã§ããåºæ¬ã2014幎3æã®ããšã§ãããæŠããŠãç§ã¯ãããŸã§ã®äººçãéããŠãæ¬ããç©äºãåŠã¶ã®ãã²ã©ãèŠæã§ãããããã¯ããããã人ã®äžã§ã©ã¡ãã®èªèãåªå¢ã§ãããã«ãããã®ã§ããç§ã¯åžžã«ãå®éã«å
容ãç解ããå®çãããéãã§ããåããŠãã®å
容ãæ¬åœã«åŠã³ãŸããããããã£ãŠãç§ã®æåã®JavaåŠç¿ã®è©Šã¿ã¯ããã®æ¬ã«ããã°ã圌ãã¯å€±æããéåœã«ãã£ããšãããæ¬ã¯ãããã ãã©ãã4 æã®ã©ããã§ãç§ã¯ JavaRush VKontakte ã°ã«ãŒãã«åºäŒããŸãããããããã¯ãã¹ãŠãã¬ãŒã«ã®äžã«é²ãã ãã®ããã«é²ã¿ãŸãããå°ãã®çè«ã䌎ã£ãŠãããããã®åé¡ã解決ããããšããææãåŠã¶ããã®æé©ãªæ¹æ³ã§ããããšã¯æããã§ã (å°ãªããšãç§ã«ãšã£ãŠã¯)ãç§ã¯å®¶ã«åº§ã£ãŠãä»äºã«åº§ã£ãŠã決ããŠã決ããŠã決ããŸããïŒãã®ãšããç§ã¯ããã°ã©ãã³ã°ãèªåã«ãšã£ãŠèå³æ·±ããã®ã§ãããšããã«ç¢ºä¿¡ããŸããããããªã«äœãã«ãã ãã£ãŠããèšæ¶ã¯ãããŸããã3ã¶æãçµã¡ããã®éã«ã¬ãã«20ã«éããŸããããã§ã«ããã°ã©ããŒãšããŠã®ä»äºã«å°±ããŠããã°ããããªãèšèªåŠç¿ã¯ãã£ãšæ©ãé²ãã ãããšç§ã«ã¯æããŸãããããããã°ã1æ¥8æéãé±5æ¥ãã®ç°å¢ã«ããããšã«ãªããéåžžã«æ©ãäžéããã§ããããããã§8æããå±¥æŽæžãéãå§ããŸãããããã€ãã®å Žæãããã¹ãã®èª²é¡ãéãããŠããŸãããããã®çµæãä»äºã®ãªãã¡ãŒã¯ãããŸããã§ãã - æ¯ãè¿ã£ãŠã¿ããšãäžåºŠãé©ããŸããã§ãã - äžããããã¿ã¹ã¯ã¯è§£æ±ºã§ãããããããŸããããç§ã®ã³ãŒãã£ã³ã° ã¹ã¿ã€ã«ã¯ææªã§ãã) Bã¡ãªã¿ã«ããã㯠JavaRush ã®å°ããªãã€ãã¹ç¹ã§ããã³ãŒãã«ã¯æ¹åã®äœå°ããããããããããããŸããããåé¡ã解決ããããã¹ãã«åæ ŒããŠããéããã¿ã¹ã¯ã¯ã«ãŠã³ããããŸããIntellij IDEA ã«åã Checkstyle ãã©ã°ã€ã³ãã€ã³ã¹ããŒã«ããã ãã§ååã§ãããç¶æ³ã¯ç°ãªããŸããã³ãŒãå
ã®ãçããããç¹ã匷調衚瀺ãããæ©èœããã ãã§ãªããçŸããæ£ããã³ãŒããäœæã§ããããã«ãªããŸããããã¯ãšãããã9æã«æåã®é¢æ¥ã«åŒã°ããŸãããæ¬ å¡ã«ã¯æ¬¡ã®ãããªå
容ãå«ãŸããŠããŸãã - ããããã¬ãã«ã®éçºè
ã«ãã¹ãã«ã«å¿ãã絊äžãæäŸããŸãããã®ã€ã³ã¿ãã¥ãŒã§ã¯ãã¿ã¹ã¯ã¯ããã次ã®ãšããã§ãããã³ãŒãã®äžéšãäžããããŸãããæ£ããæžãããŠããŸãã?ãŸããã©ã®ãããªåé¡ãçºçããå¯èœæ§ããããŸãã? äœåæ£è§£ãããèŠããŠããªããäžè¬ã«ãNull ã«ã€ããŠèŠããŠããå¿
èŠããããŸãããã»ãšãã©ãã¹ãŠã®è³ªåã¯ããã«é¢ãããã®ã§ããã(param != null ã®å Žå) æåã«ãã§ãã¯ããããšãªãã«ã¡ãœãã ãã©ã¡ãŒã¿ã«ã¢ã¯ã»ã¹ãã¹ãã§ã¯ãããŸããããã®çµæã«åºã¥ããŠãæåã® 1 ãæé (ã€ã³ã¿ãŒã³ã·ãããšããŠ) ã¯ç¡æã§åãããšãææ¡ããããã®åŸã¯ã以åã®å€åå
ããã (ããã»ã©ã§ã¯ãããŸããã) äœã絊æã§åãããšã決ãŸããŸãããçè«ãã»ãšãã©ç¥ãããJavaRush ã®ã¿ã§å®è·µããçµéšããŒãã ã£ãã®ã§ãçŽ æŽãããææ¡ãæåŸ
ããŠã¯ãããªãããšãããç解ããŸããããããã£ãŠãç§ã¯ 2 é±éåŸã«éè·ããããšã«åæããŸããïŒä»¥åã®è·å ŽãèŸããã®ã«é©åãªææïŒãåæã«å¥ã®äŒç€Ÿã«å±¥æŽæžãæåºããŸããããã®äŒç€Ÿã¯æ¬¡ã®ããšãæäŸããŸããã
- 2 ãæéã® Java EE ãã¬ãŒãã³ã° (é± 2 åã4 æé)
- è¯ãçµæã瀺ãã°ïŒãã® 2 ãæéæžãç¶ãããããžã§ã¯ããæè·ããããšã«æåããå ŽåïŒãä»äºãäžããããŸãã
- èªå® ã§å®è·µçãªã¿ã¹ã¯ãå®è¡ããŸãã
- åæ Œãããšããªãã£ã¹ã§ã®ã³ã³ãã¥ãŒã¿ãŒãã¹ãã«æåŸ ãããŸãã
- è©Šéšã«åæ Œããå Žåã¯ãå³æ¥é¢æ¥ãšãªããŸãã
- ãã§ãã¯ãããäŸå€ãšãã§ãã¯ãããŠããªãäŸå€ã®éãã¯äœã§ããã
- Object ã¯ã©ã¹ã«ã¯ã©ã®ãããªã¡ãœãããããããããããªãå¿ èŠãªã®ãã
- ã©ã®ãããªçš®é¡ã®ã³ã¬ã¯ã·ã§ã³ãããã®ãââããŸããªãããã«ããã®ãã
- ãã«ãã¹ã¬ããã«ã€ããŠãå°ã説æããŸãã
GO TO FULL VERSION