{"id":719,"date":"2017-09-11T14:47:01","date_gmt":"2017-09-11T14:47:01","guid":{"rendered":"http:\/\/danielschlegel.org\/wp\/?page_id=719"},"modified":"2017-09-11T14:47:01","modified_gmt":"2017-09-11T14:47:01","slug":"class-code-9817","status":"publish","type":"page","link":"https:\/\/danielschlegel.org\/wp\/teaching\/csc241-fall-2017\/class-code-9817\/","title":{"rendered":"Class Code 9\/8\/17"},"content":{"rendered":"<h5>RefValEx.java<\/h5>\n<pre>\r\nclass TestClass {\r\n    private int val;\r\n    \r\n    public TestClass(int val){\r\n        this.val = val;\r\n    }\r\n\r\n    public int getVal(){\r\n        return val;\r\n    }\r\n\r\n    public void setVal(int v){\r\n        val = v;\r\n    }   \r\n}\r\n\r\npublic class RefValEx {\r\n    public static void modifyRef(TestClass c){\r\n        c.setVal(42);\r\n    }\r\n\r\n    public static void modifyVal(int i){\r\n        i++;\r\n    }\r\n\r\n    public static void refVsVal(){\r\n        int v = 19;\r\n        int v2 = v;\r\n        System.out.println(\"int v: \" + v);\r\n        v2++;\r\n        System.out.println(\"int v: \" + v);\r\n        System.out.println(\"int v2: \" + v2);\r\n        \r\n        TestClass tc = new TestClass(19);\r\n        TestClass tc2 = tc;\r\n        System.out.println(\"tc.getVal(): \" + tc.getVal());\r\n        tc2.setVal(47);\r\n        System.out.println(\"tc.getVal(): \" + tc.getVal());\r\n        System.out.println(\"tc2.getVal(): \" + tc2.getVal());\r\n\r\n        \/\/ Examining reference equality.\r\n        System.out.println(\"tc==tc2: \" + (tc == tc2));\r\n        TestClass tc3 = new TestClass(47);\r\n        System.out.println(\"tc==tc3: \" + (tc == tc3));\r\n    }\r\n\r\n    public static void passByRefVsVal(){\r\n        int v = 19;\r\n        System.out.println(\"int v: \" + v);\r\n        modifyVal(v);\r\n        System.out.println(\"int v: \" + v);\r\n\r\n        TestClass tc = new TestClass(19);\r\n        System.out.println(\"tc.getVal(): \" + tc.getVal());\r\n        modifyRef(tc);\r\n        System.out.println(\"tc.getVal(): \" + tc.getVal());\r\n    }\r\n\r\n    public static void main(String[] args){\r\n        System.out.println(\"--- Ref vs. Val ---\");\r\n        refVsVal();\r\n        System.out.println(\"--- Pass by ref vs. Pass by val ---\");\r\n        passByRefVsVal();\r\n    }\r\n}\r\n<\/pre>\n<h5>EnumTest.java<\/h5>\n<pre>\r\n\/\/ An adaptation of code from\r\n\/\/ https:\/\/docs.oracle.com\/javase\/tutorial\/java\/javaOO\/enum.html\r\n\r\npublic class EnumTest {\r\n    public enum Day {MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY }\r\n\r\n    private Day day; \r\n\r\n    public EnumTest(Day day){\r\n        this.day = day;\r\n    }\r\n\r\n    public void tellItLikeItIs() {\r\n        switch (day) {\r\n            case MONDAY:\r\n                System.out.println(\"Mondays are bad.\");\r\n                break;\r\n                    \r\n            case FRIDAY:\r\n                System.out.println(\"Fridays are better.\");\r\n                break;\r\n                         \r\n            case SATURDAY: case SUNDAY:\r\n                System.out.println(\"Weekends are best.\");\r\n                break;\r\n                        \r\n            default:\r\n                System.out.println(\"Midweek days are so-so.\");\r\n                break;\r\n\r\n        }\r\n    }\r\n\r\n    public static void main(String[] args){\r\n        EnumTest e = new EnumTest(Day.FRIDAY);\r\n        e.tellItLikeItIs();\r\n    }\r\n}\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p class=\"lead\">RefValEx.java class TestClass { private int val; public TestClass(int val){ this.val = val; } public int getVal(){ return val; } public void setVal(int v){ val = v; } } public class RefValEx { public static void modifyRef(TestClass c){ c.setVal(42); } public static void modifyVal(int i){ i++; } public static void refVsVal(){ int v = 19; int v2 = v; System.out.println(&#8220;int&hellip;<\/p>\n<p class=\"more-link-p\"><a class=\"btn btn-warning\" href=\"https:\/\/danielschlegel.org\/wp\/teaching\/csc241-fall-2017\/class-code-9817\/\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":580,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_editorskit_title_hidden":false,"_editorskit_reading_time":0,"_editorskit_is_block_options_detached":false,"_editorskit_block_options_position":"{}","footnotes":""},"class_list":["post-719","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Class Code 9\/8\/17 - Daniel R. 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