{"id":10539,"date":"2015-08-02T09:56:24","date_gmt":"2015-08-02T13:56:24","guid":{"rendered":"http:\/\/bangla.salearningschool.com\/?p=10539"},"modified":"2015-08-04T10:19:31","modified_gmt":"2015-08-04T14:19:31","slug":"example-illustrating-inheritance-and-abstract-classes","status":"publish","type":"post","link":"http:\/\/bangla.sitestree.com\/?p=10539","title":{"rendered":"Example illustrating inheritance and abstract classes"},"content":{"rendered":"<h2>illustrating inheritance \u098f\u09ac\u0982 abstract classes \u098f\u09b0 \u0989\u09a6\u09be\u09b9\u09b0\u09a3<\/h2>\n<ul>\n<li><strong>Shape.java<\/strong> <span id=\"result_box\" class=\"\" lang=\"bn\"><span class=\"hps\">\u09b8\u09ac<\/span>, <span class=\"hps\">\u09ac\u09a6\u09cd\u09a7<\/span> <span class=\"hps\">\u0996\u09cb\u09b2\u09be<\/span><span class=\"\">,<\/span> <span class=\"hps\">\u09ac\u09be\u0981\u0995\u09be<\/span><span class=\"\">,<\/span> <span class=\"hps\">\u098f\u09ac\u0982 \u09b8\u09cb\u099c\u09be<\/span> <span class=\"hps alt-edited\">\u09aa\u09be\u09b0\u09cd\u09b6\u09cd\u09ac\u09c7 \u09a7\u09be\u09b0\u09ac\u09bf\u09b6\u09bf\u09b7\u09cd\u099f<\/span> <span class=\"hps\">\u0986\u0995\u09be\u09b0<\/span><\/span> \u098f\u09b0 \u099c\u09a8\u09cd\u09af \u09aa\u09cd\u09af\u09be\u09b0\u09c7\u09a8\u09cd\u099f \u0995\u09cd\u09b2\u09be\u09b8 (\u09b8\u09be\u09b0\u09be\u0982\u09b6)\u0964<\/li>\n<li><strong>Curve.java<\/strong> <span id=\"result_box\" class=\"short_text\" lang=\"bn\"><span class=\"hps\">\u098f\u0995\u099f\u09bf<\/span> <span class=\"hps atn\">(<\/span>\u09b8\u09be\u09b0\u09be\u0982\u09b6) <span class=\"hps\">\u09ac\u09be\u0981\u0995\u09be<\/span> <span class=\"hps\">\u0986\u0995\u09be\u09b0<\/span> <span class=\"hps atn\">(<\/span><span class=\"\">\u0996\u09cb\u09b2\u09be \u09ac\u09be \u09ac\u09a8\u09cd\u09a7<\/span><span class=\"\">)<\/span><span class=\"\">\u0964<\/span><\/span><\/li>\n<li><strong>StraightEdgedShape.java<\/strong> \u09b8\u09b0\u09be\u09b8\u09b0\u09bf \u09a7\u09be\u09b0 \u09b8\u09ae\u09cd\u09ac\u09b2\u09bf\u09a4 \u098f\u0995\u099f\u09bf \u0986\u0995\u09c3\u09a4\u09bf (\u0996\u09cb\u09b2\u09be \u09ac\u09be \u09ac\u09a8\u09cd\u09a7)\u0964<\/li>\n<li><strong>Measurable.java<\/strong> <span id=\"result_box\" class=\"short_text\" lang=\"bn\"><span class=\"hps\">\u09aa\u09b0\u09bf\u09ae\u09be\u09aa\u09af\u09cb\u0997\u09cd\u09af<\/span> <span class=\"hps\">\u098f\u09b2\u09be\u0995\u09be\u09af\u09bc<\/span> <span class=\"hps\">\u0987\u09a8\u09cd\u099f\u09be\u09b0\u09ab\u09c7\u09b8 \u09a1\u09bf\u09ab\u09be\u0987\u09a8\u09bf\u0982 \u0995\u09cd\u09b2\u09be\u09b8<\/span><span class=\"\">\u0964<\/span><\/span><\/li>\n<li><strong>Circle.java<\/strong> <span id=\"result_box\" class=\"\" lang=\"bn\"><span class=\"hps\">\u098f\u0995\u099f\u09bf<\/span> <span class=\"hps\">\u09ac\u09c3\u09a4\u09cd\u09a4<\/span><\/span> \u09af\u09be <span id=\"result_box\" class=\"\" lang=\"bn\"><span class=\"hps\">\u0986\u0995\u09be\u09b0<\/span> <span class=\"hps\">\u09aa\u09cd\u09b0\u09b8\u09be\u09b0\u09bf\u09a4 \u0995\u09b0\u09c7 \u098f\u09ac\u0982<\/span> <span id=\"result_box\" class=\"short_text\" lang=\"bn\"><span class=\"hps\">\u09aa\u09b0\u09bf\u09ae\u09be\u09aa<\/span> <span class=\"hps\">\u09aa\u09cd\u09b0\u09af\u09bc\u09cb\u0997 \u0995\u09b0\u09c7\u0964<\/span><\/span><\/span><\/li>\n<li><strong>MeasureUtil.java<\/strong> <span id=\"result_box\" class=\"short_text\" lang=\"bn\"><span class=\"hps\">\u09aa\u09b0\u09bf\u09ae\u09be\u09aa\u09af\u09cb\u0997\u09cd\u09af<\/span> <span class=\"hps alt-edited\">\u09b8\u09cd\u09a5\u09be\u09a8\u09c7\u09b0\u00a0<\/span><span class=\"hps\">\u0989\u09aa\u09b0 \u0995\u09be\u099c \u0995\u09b0\u09c7\u0964<\/span><\/span><\/li>\n<li><strong>Polygon.java<\/strong> <span id=\"result_box\" class=\"\" lang=\"bn\"><span class=\"hps\">\u09b8\u09b0\u09be\u09b8\u09b0\u09bf \u09a7\u09be\u09b0 \u09b8\u09ae\u09cd\u09ac\u09b2\u09bf\u09a4 \u098f\u0995\u099f\u09bf<\/span> <span class=\"hps\">\u09ac\u09a6\u09cd\u09a7<\/span> <span class=\"hps\">\u0986\u0995\u09c3\u09a4\u09bf;<\/span> <span class=\"hps\">StraightEdgedShape<\/span> <span class=\"hps\">\u09aa\u09cd\u09b0\u09b8\u09be\u09b0\u09bf\u09a4 \u0995\u09b0\u09c7 \u098f\u09ac\u0982<\/span> <span class=\"hps\">\u09aa\u09b0\u09bf\u09ae\u09be\u09aa<\/span> <span class=\"hps\">\u09aa\u09cd\u09b0\u09af\u09bc\u09cb\u0997 \u0995\u09b0\u09c7\u0964<\/span><\/span><\/li>\n<li><strong>Rectangle.java<\/strong> <span id=\"result_box\" class=\"\" lang=\"bn\"><span class=\"hps\">\u098f\u0995\u099f\u09bf<\/span> <span class=\"hps\">\u0986\u09af\u09bc\u09a4\u0995\u09cd\u09b7\u09c7\u09a4\u09cd\u09b0<\/span><\/span> \u09af\u09be <span id=\"result_box\" class=\"\" lang=\"bn\"><span class=\"hps\">\u09aa\u09b0\u09bf\u09ae\u09be\u09aa\u09af\u09cb\u0997\u09cd\u09af<\/span> <span class=\"hps\">\u0987\u09a8\u09cd\u099f\u09be\u09b0\u09ab\u09c7\u09b8<\/span> <span class=\"hps\">\u09a7\u09be\u09b0\u09a3 \u0995\u09b0\u09c7<\/span><span class=\"\">;<\/span> <span class=\"hps\">\u09ac\u09b9\u09c1\u09ad\u09c1\u099c\u09c7<\/span> <span class=\"hps\">\u09aa\u09cd\u09b0\u09b8\u09be\u09b0\u09bf\u09a4 \u0995\u09b0\u09c7\u0964<\/span><\/span><\/li>\n<li><strong>MeasureTest.java<\/strong> <span id=\"result_box\" class=\"short_text\" lang=\"bn\"><span class=\"hps alt-edited\">\u0989\u09a6\u09be\u09b9\u09b0\u09a3 \u098f\u09b0 \u099c\u09a8\u09cd\u09af<\/span> <span class=\"hps\">\u09a1\u09cd\u09b0\u09be\u0987\u09ad\u09be\u09b0<\/span><span class=\"\">\u0964<\/span><\/span><\/li>\n<\/ul>\n<h2><strong>Shape.java<\/strong><\/h2>\n<hr \/>\n<pre>\/** The parent class for all closed, open, curved, and \r\n\u00a0*\u00a0 straight-edged shapes.\r\n\u00a0*\r\n\r\npublic abstract class Shape {\r\n\u00a0 protected int x, y;\r\n\r\n\u00a0 public int getX() {\r\n\u00a0\u00a0\u00a0 return(x);\r\n\u00a0 }\r\n\r\n\u00a0 public void setX(int x) {\r\n\u00a0\u00a0\u00a0 this.x = x;\r\n\u00a0 }\r\n\r\n\u00a0 public int getY() {\r\n\u00a0\u00a0\u00a0 return(y);\r\n\u00a0 }\r\n\r\n\u00a0 public void setY(int y) {\r\n\u00a0\u00a0\u00a0 this.y = y;\r\n\u00a0 }\r\n}<\/pre>\n<hr \/>\n<pre><\/pre>\n<p>&nbsp;<\/p>\n<h2><strong>Curve.java <\/strong><\/h2>\n<p><span id=\"result_box\" class=\"short_text\" lang=\"bn\"><span class=\"hps\">\u098f\u0995\u099f\u09bf<\/span> <span class=\"hps atn\">(<\/span>\u09b8\u09be\u09b0\u09be\u0982\u09b6) <span class=\"hps\">\u09ac\u09be\u0981\u0995\u09be<\/span> <span class=\"hps\">\u0986\u0995\u09be\u09b0<\/span> <span class=\"hps atn\">(<\/span><span class=\"\">\u0996\u09cb\u09b2\u09be \u09ac\u09be \u09ac\u09a8\u09cd\u09a7<\/span><span class=\"\">) <\/span><span class=\"\">\u0964<\/span><\/span> Curve.java An (abstract) curved Shape (open or closed)<\/p>\n<hr \/>\n<pre>\/** A curved shape (open or closed). Subclasses will include\r\n\u00a0*\u00a0 arcs and circles.\r\n\u00a0*<\/pre>\n<pre>public abstract class Curve extends Shape {}<\/pre>\n<hr \/>\n<p>&nbsp;<\/p>\n<h2><strong>StraightEdgedShape.java <\/strong><\/h2>\n<p>\u09b8\u09b0\u09be\u09b8\u09b0\u09bf \u09a7\u09be\u09b0 \u09b8\u09ae\u09cd\u09ac\u09b2\u09bf\u09a4 \u098f\u0995\u099f\u09bf \u0986\u0995\u09c3\u09a4\u09bf (\u0996\u09cb\u09b2\u09be \u09ac\u09be \u09ac\u09a8\u09cd\u09a7) \u0964 A Shape with straight edges (open or closed).<\/p>\n<hr \/>\n<pre>\/** A Shape with straight edges (open or closed). Subclasses\r\n\u00a0*\u00a0 will include Line, LineSegment, LinkedLineSegments,\r\n\u00a0*\u00a0 and Polygon.\r\n\u00a0*\r\n\r\npublic abstract class StraightEdgedShape extends Shape {}<\/pre>\n<hr \/>\n<p>&nbsp;<\/p>\n<h2><strong>Measurable.java<\/strong><\/h2>\n<p><span id=\"result_box\" class=\"short_text\" lang=\"bn\"><span class=\"hps\">\u09aa\u09b0\u09bf\u09ae\u09be\u09aa\u09af\u09cb\u0997\u09cd\u09af<\/span> <span class=\"hps\">\u098f\u09b2\u09be\u0995\u09be\u09af\u09bc<\/span> <span class=\"hps\">\u0987\u09a8\u09cd\u099f\u09be\u09b0\u09ab\u09c7\u09b8 \u09a1\u09bf\u09ab\u09be\u0987\u09a8\u09bf\u0982 \u0995\u09cd\u09b2\u09be\u09b8<\/span><span class=\"\">\u0964<\/span><\/span> Interface defining classes with measurable areas<\/p>\n<hr \/>\n<pre>\/** Used in classes with measurable areas. \r\n\u00a0*\r\n\u00a0**************\r\n\r\npublic interface Measurable {\r\n\u00a0 double getArea();\r\n}<\/pre>\n<hr \/>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h2><strong>Circle.java<\/strong><\/h2>\n<p><span id=\"result_box\" class=\"\" lang=\"bn\"><span class=\"hps\">\u098f\u0995\u099f\u09bf<\/span> <span class=\"hps\">\u09ac\u09c3\u09a4\u09cd\u09a4<\/span><\/span> \u09af\u09be <span id=\"result_box\" class=\"\" lang=\"bn\"><span class=\"hps\">\u0986\u0995\u09be\u09b0<\/span> <span class=\"hps\">\u09aa\u09cd\u09b0\u09b8\u09be\u09b0\u09bf\u09a4 \u0995\u09b0\u09c7 \u098f\u09ac\u0982<\/span> <span id=\"result_box\" class=\"short_text\" lang=\"bn\"><span class=\"hps\">\u09aa\u09b0\u09bf\u09ae\u09be\u09aa<\/span> <span class=\"hps\">\u09aa\u09cd\u09b0\u09af\u09bc\u09cb\u0997 \u0995\u09b0\u09c7\u00a0 \u0964\u00a0<\/span><\/span><\/span> A circle that extends Shape and implements Measurable.<\/p>\n<hr \/>\n<pre>\/** A circle. Since you can calculate the area of\r\n\u00a0*\u00a0 circles, class implements the Measurable interface.\r\n\u00a0*\r\n\r\npublic class Circle extends Curve implements Measurable {\r\n\u00a0 private double radius;\r\n\r\n\u00a0 public Circle(int x, int y, double radius) {\r\n\u00a0\u00a0\u00a0 setX(x);\r\n\u00a0\u00a0\u00a0 setY(y);\r\n\u00a0\u00a0\u00a0 setRadius(radius);\r\n\u00a0 }\r\n\r\n\u00a0 public double getRadius() {\r\n\u00a0\u00a0\u00a0 return(radius);\r\n\u00a0 }\r\n\r\n\u00a0 public void setRadius(double radius) {\r\n\u00a0\u00a0\u00a0 this.radius = radius;\r\n\u00a0 }\r\n\r\n\u00a0 \/** Required for Measurable interface. *\/\r\n\r\n\u00a0 public double getArea() {\r\n\u00a0\u00a0\u00a0 return(Math.PI * radius * radius);\r\n\u00a0 }\r\n}<\/pre>\n<hr \/>\n<p>&nbsp;<\/p>\n<h2><strong>MeasureUtil.java<\/strong><\/h2>\n<p><span id=\"result_box\" class=\"short_text\" lang=\"bn\"><span class=\"hps\">\u09aa\u09b0\u09bf\u09ae\u09be\u09aa\u09af\u09cb\u0997\u09cd\u09af<\/span> <span class=\"hps alt-edited\">\u09b8\u09cd\u09a5\u09be\u09a8\u09c7\u09b0\u00a0<\/span><span class=\"hps\">\u0989\u09aa\u09b0 \u0995\u09be\u099c \u0995\u09b0\u09c7\u00a0 \u0964\u00a0<\/span><\/span> Operates on Measurable instances<\/p>\n<hr \/>\n<pre>\/** Some operations on Measurable instances. \r\n\u00a0*\r\n\r\npublic class MeasureUtil {\r\n\u00a0 public static double maxArea(Measurable m1,\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Measurable m2) {\r\n\u00a0\u00a0\u00a0 return(Math.max(m1.getArea(), m2.getArea()));\r\n\u00a0 }\r\n\r\n\u00a0 public static double totalArea(Measurable[] mArray) {\r\n\u00a0\u00a0\u00a0 double total = 0;\r\n\u00a0\u00a0\u00a0 for(int i=0; i<\/pre>\n<hr \/>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>illustrating inheritance \u098f\u09ac\u0982 abstract classes \u098f\u09b0 \u0989\u09a6\u09be\u09b9\u09b0\u09a3 Shape.java \u09b8\u09ac, \u09ac\u09a6\u09cd\u09a7 \u0996\u09cb\u09b2\u09be, \u09ac\u09be\u0981\u0995\u09be, \u098f\u09ac\u0982 \u09b8\u09cb\u099c\u09be \u09aa\u09be\u09b0\u09cd\u09b6\u09cd\u09ac\u09c7 \u09a7\u09be\u09b0\u09ac\u09bf\u09b6\u09bf\u09b7\u09cd\u099f \u0986\u0995\u09be\u09b0 \u098f\u09b0 \u099c\u09a8\u09cd\u09af \u09aa\u09cd\u09af\u09be\u09b0\u09c7\u09a8\u09cd\u099f \u0995\u09cd\u09b2\u09be\u09b8 (\u09b8\u09be\u09b0\u09be\u0982\u09b6)\u0964 Curve.java \u098f\u0995\u099f\u09bf (\u09b8\u09be\u09b0\u09be\u0982\u09b6) \u09ac\u09be\u0981\u0995\u09be \u0986\u0995\u09be\u09b0 (\u0996\u09cb\u09b2\u09be \u09ac\u09be \u09ac\u09a8\u09cd\u09a7)\u0964 StraightEdgedShape.java \u09b8\u09b0\u09be\u09b8\u09b0\u09bf \u09a7\u09be\u09b0 \u09b8\u09ae\u09cd\u09ac\u09b2\u09bf\u09a4 \u098f\u0995\u099f\u09bf \u0986\u0995\u09c3\u09a4\u09bf (\u0996\u09cb\u09b2\u09be \u09ac\u09be \u09ac\u09a8\u09cd\u09a7)\u0964 Measurable.java \u09aa\u09b0\u09bf\u09ae\u09be\u09aa\u09af\u09cb\u0997\u09cd\u09af \u098f\u09b2\u09be\u0995\u09be\u09af\u09bc \u0987\u09a8\u09cd\u099f\u09be\u09b0\u09ab\u09c7\u09b8 \u09a1\u09bf\u09ab\u09be\u0987\u09a8\u09bf\u0982 \u0995\u09cd\u09b2\u09be\u09b8\u0964 Circle.java \u098f\u0995\u099f\u09bf \u09ac\u09c3\u09a4\u09cd\u09a4 \u09af\u09be \u0986\u0995\u09be\u09b0 \u09aa\u09cd\u09b0\u09b8\u09be\u09b0\u09bf\u09a4 \u0995\u09b0\u09c7 \u098f\u09ac\u0982 \u09aa\u09b0\u09bf\u09ae\u09be\u09aa \u09aa\u09cd\u09b0\u09af\u09bc\u09cb\u0997 &hellip; <\/p>\n<p><a class=\"more-link btn\" href=\"http:\/\/bangla.sitestree.com\/?p=10539\">Continue reading<\/a><\/p>\n","protected":false},"author":130,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1417,1424],"tags":[1474,1471,513,706,1473,308,1470,1472,618,285],"class_list":["post-10539","post","type-post","status-publish","format-standard","hentry","category-code-programming-samples--","category-javaj2eej2me","tag-abstract","tag-circle","tag-class","tag-code","tag-curve","tag-java","tag-measure","tag-shape","tag-618","tag-285","item-wrap"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":6678,"url":"http:\/\/bangla.sitestree.com\/?p=6678","url_meta":{"origin":10539,"position":0},"title":"\u0989\u0987\u09a8\u09cd\u09a1\u09cb\u099c \u09ee.\u09e7 \u099f\u09bf\u0989\u099f\u09cb\u09b0\u09bf\u09df\u09be\u09b2: \u09a1\u09c7\u09b8\u09cd\u0995\u099f\u09aa (Familiar 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