\n\t\u7b2c\u4e8c\u5355\u5143\u4efb\u52a1\u4e94\u5b9e\u8bad\uff1a\u901a\u8fc7\u7a0b\u5e8f\u8bbe\u8ba1\u51e0\u4f55\u56fe\u5f62\u63a5\u53e3\uff08Shape\uff09\uff0c\u5b9e\u73b0\u7c7b\u77e9\u5f62\uff08Rectangle\uff09\u3001\u5706\u5f62\uff08Circle\uff09\u3001\u6b63\u65b9\u5f62\uff08Square\uff09\u51e0\u79cd\u7c7b\u578b\uff0c\u80fd\u591f\u5229\u7528\u63a5\u53e3\u548c\u591a\u6001\u6027\u8ba1\u7b97\u51e0\u4f55\u56fe\u5f62\u7684\u9762\u79ef\u548c\u5468\u957f\u5e76\u663e\u793a\u3002\n<\/p>\n
\n\t\/\/\u63a5\u53e3\n<\/p>\n
\n\t \n<\/p>\n
public interface Shape {\n\tpublic double perimeter();\/\/\u5468\u957f\n\tpublic double area();\/\/\u9762\u79ef\n}\n\t\/\/\u77e9\u5f62\n\tclass Rectangle implements Shape{\n\tdouble a ;\t \/\/\u957f\n\tdouble b ;\t \/\/\u5bbd\n\tpublic Rectangle(double a,double b){\n\t\tthis.a=a;\n\t\tthis.b=b;\n\t}\n\tpublic double perimeter(){\n\t\treturn 2*(a+b);\n\t}\n\tpublic double area(){\n\t\treturn a*b;\n\t}\n\t}\n\t\/\/\u5706\u5f62\n\t\tclass Circle implements Shape {\n\t\tpublic static final double PI=3.14;\n\t\tdouble r;\t \/\/\u534a\u5f84\n\t\tpublic Circle(double r){\n\t\t\tthis.r=r;\n\t\t}\n\t\tpublic double perimeter(){\n\t\t\treturn 2*PI*r;\n\t\t}\n\t\tpublic double area(){\n\t\t\treturn PI*r*r;\n\t\t}\n\n\t}\n\t\/\/\u6b63\u65b9\u5f62\n\t\tclass Square implements Shape {\n\t\tdouble a ;\t\/\/\u8fb9\u957f\n\t\tpublic Square(double a){\n\t\t\tthis.a=a;\n\t\t}\n\t\tpublic double perimeter(){\n\t\t\treturn 4*a;\n\t\t}\n\t\tpublic double area(){\n\t\t\treturn a*a;\n\t\t}\n\n\t\t}\n\n<\/pre>\n\/\/\u6d4b\u8bd5<\/p>\n
\n\t\n<\/p>\n
\n\t \n<\/p>\n
import java.util.*;\npublic class ShapeTest {\n\n\t\/**\n\t * @param args\n\t *\/\n\t\/*\n\t * \u83b7\u5f97\u7c7b\u578b\u7684\u4fe1\u606f\n\n\t\u5728\u83b7\u5f97\u7c7b\u578b\u7c7b\u4e4b\u540e\uff0c\u4f60\u5c31\u53ef\u4ee5\u8c03\u7528\u5176\u4e2d\u7684\u4e00\u4e9b\u65b9\u6cd5\u83b7\u5f97\u7c7b\u578b\u7684\u4fe1\u606f\u4e86\uff0c\u4e3b\u8981\u7684\u65b9\u6cd5\u6709\uff1a\n\n\tgetName():String\uff1a\u83b7\u5f97\u8be5\u7c7b\u578b\u7684\u5168\u79f0\u540d\u79f0\u3002\n\n\tgetSuperClass():Class\uff1a\u83b7\u5f97\u8be5\u7c7b\u578b\u7684\u76f4\u63a5\u7236\u7c7b\uff0c\u5982\u679c\u8be5\u7c7b\u578b\u6ca1\u6709\u76f4\u63a5\u7236\u7c7b\uff0c\u90a3\u4e48\u8fd4\u56denull\u3002\n\n\tgetInterfaces():Class[]\uff1a\u83b7\u5f97\u8be5\u7c7b\u578b\u5b9e\u73b0\u7684\u6240\u6709\u63a5\u53e3\u3002\n\n\tisArray():boolean\uff1a\u5224\u65ad\u8be5\u7c7b\u578b\u662f\u5426\u662f\u6570\u7ec4\u3002\n\n\tisEnum():boolean\uff1a\u5224\u65ad\u8be5\u7c7b\u578b\u662f\u5426\u662f\u679a\u4e3e\u7c7b\u578b\u3002\n\n\tisInterface():boolean\uff1a\u5224\u65ad\u8be5\u7c7b\u578b\u662f\u5426\u662f\u63a5\u53e3\u3002\n\n\tisPrimitive():boolean\uff1a\u5224\u65ad\u8be5\u7c7b\u578b\u662f\u5426\u662f\u57fa\u672c\u7c7b\u578b\uff0c\u5373\u662f\u5426\u662fint\uff0cboolean\uff0cdouble\u7b49\u7b49\u3002\n\n\tisAssignableFrom(Class cls):boolean\uff1a\u5224\u65ad\u8fd9\u4e2a\u7c7b\u578b\u662f\u5426\u662f\u7c7b\u578bcls\u7684\u7236\uff08\u7956\u5148\uff09\u7c7b\u6216\u7236\uff08\u7956\u5148\uff09\u63a5\u53e3\u3002\n\n\tgetComponentType():Class\uff1a\u5982\u679c\u8be5\u7c7b\u578b\u662f\u4e00\u4e2a\u6570\u7ec4\uff0c\u90a3\u4e48\u8fd4\u56de\u8be5\u6570\u7ec4\u7684\u7ec4\u4ef6\u7c7b\u578b\u3002\n\n\t*\/\n\t public static void print(Shape shape){\t\/\/\u5728\u4e66\u672cp86\u90a3\u91cc\u6709\u8bf4\u5230\u3002\n System.out.println(shape.getClass()+\"\u9762\u79ef\uff1a\"+shape.area());\t\t\/\/\u5229\u7528getClass()\u7684\u65b9\u6cd5\u80fd\n System.out.println(shape.getClass()+\"\u5468\u957f\uff1a\"+shape.perimeter());\n }\n\tpublic static void main(String[] args) {\n\t\tScanner input = new Scanner(System.in);\n\t\tSystem.out.println(\"***********\u67e5\u6c34\u8868**************\");\n\t\tSystem.out.println(\"\u8bf7\u8f93\u5165\u4f60\u9700\u8981\u8ba1\u7b97\u6709\u54ea\u4e9b\u96c6\u5408\u56fe\u5f62\u9762\u79ef\u3002\");\n\t\tSystem.out.println(\"\u56de\u590d1\u4e3a\u77e9\u5f62\uff0c2\u4e3a\u5706\u5f62\uff0c3\u4e3a\u6b63\u65b9\u5f62\");\n\t\tint a=input.nextInt();\n\t\tif(a==1){\n\t\t\tSystem.out.println(\"\u8bf7\u8f93\u5165\u77e9\u5f62\u7684\u957f\uff1a\");\n\t\t\tint chang=input.nextInt();\t\/\/\u8f93\u5165\u957f\n\t\t\tSystem.out.println(\"\u8bf7\u8f93\u5165\u77e9\u5f62\u7684\u5bbd\uff1a\");\n\t\t\tint kuan=input.nextInt();\t\/\/\u8f93\u5165\u5bbd\n\t\t\tShape shape=new Rectangle(chang,kuan);\t\/\/\u5df2\u7ecf\u5728\u63a5\u53e3\u4e2d\u5b9a\u4e49\u4e86a\u4e3a\u957f\uff0ca==chang\uff0cb==kuan\n\t\t\tprint(shape);\t\/\/\u8f93\u51fa\u8868\u8fbe\n\t\t}else if(a==2){\n\t\t\tSystem.out.println(\"\u8bf7\u8f93\u5165\u5706\u5f62\u7684\u534a\u5f84\uff1a\");\n\t\t\tint r=input.nextInt();\t\/\/\u8f93\u5165\u5706\u7684\u534a\u5f84\n\t\t\tShape shape=new Circle(r);\t\/\/\u540c\u4e0a\uff0c\u5df2\u7ecf\u5728\u63a5\u53e3\u4e2d\u5b9a\u4e49\u4e86\n\t print(shape);\n\t\t}else if(a==3){\n\t\t\tSystem.out.println(\"\u8bf7\u8f93\u5165\u6b63\u65b9\u5f62\u7684\u8fb9\u957f\uff1a\");\n\t\t\tint chang1=input.nextInt();\t\/\/\u8f93\u5165\u6b63\u65b9\u5f62\u8fb9\u957f\n\t\t\tShape shape=new Square(chang1);\t\/\/\u540c\u4e0a\uff0c\u5df2\u7ecf\u5728\u63a5\u53e3\u4e2d\u5b9a\u4e49\u4e86\n\t print(shape);\n\t\t}else{\n\t\t\tSystem.out.println(\"\u60a8\u8f93\u5165\u9519\u8bef\uff01\u8bf7\u8fd4\u56de\u91cd\u65b0\u8f93\u5165\");\n\t\t}\n\t\t System.out.println(\"\u67e5\u6c34\u8868\u7ed3\u675f\");\n System.out.println(\"***********\u67e5\u6c34\u8868**************\");\n\t}\n\n}<\/pre>\n\n\t\u4e0b\u9762\u662f\u4e09\u89d2\u5f62\u548c\u957f\u65b9\u5f62\u7684\u5468\u957f\u548c\u9762\u79ef\u7684\u8ba1\u7b97\u4ee3\u7801\u3002\n<\/p>\n
\npublic interface Shape {\n public double area();\/\/\u9762\u79ef\n public double longer();\/\/\u5468\u957f\n}\n\/\/\u4e09\u89d2\u5f62\npublic class Triangle implements Shape {\n double s1;\n double s2;\n double s3;\n \/\/ \u521d\u59cb\u5316\u4e00\u4e2a\u4e09\u89d2\u5f62\u5bf9\u8c61\uff0c\u5e76\u8d4b\u4e88\u8be5\u4e09\u89d2\u5f62\u4e09\u8fb9\u957f\n public Triangle(double s1, double s2, double s3) {\n if (isTri(s1, s2, s3)) {\n this.s1 = s1;\n this.s2 = s2;\n this.s3 = s3;\n } else {\n System.out.println(\"\u8f93\u5165\u7684\u4e09\u8fb9\u957f\" + s1 + \"\u3001\" + s2 + \"\u3001\" + s3\n + \"\u4e0d\u80fd\u7ec4\u6210\u4e00\u4e2a\u4e09\u89d2\u5f62\uff0c\u8bf7\u91cd\u65b0\u8f93\u5165\u4e09\u8fb9\u957f\uff01\");\n }\n }\n \/\/ \u5224\u65ad\u662f\u5426\u662f\u4e2a\u4e09\u89d2\u5f62\n public boolean isTri(double s1, double s2, double s3) {\n if (s1 + s2 < s3) {\n return false;\n }\n if (s1 + s3 < s2) {\n return false;\n }\n if (s2 + s3 < s1) {\n return false;\n }\n return true;\n }\n \/\/\u9762\u79ef\n public double area() {\n double p = (s1 + s2 + s3) \/ 2;\n return Math.sqrt(p * (p - s1) * (p - s2) * (p - s3));\n }\n\/\/\u5468\u957f\n public double longer() {\n return s1 + s2 + s3;\n }\n}\n\/\/\u957f\u65b9\u5f62\npublic class Director implements Shape {\n double s1;\n double s2;\n \/\/ \u521d\u59cb\u5316\u4e00\u4e2a\u957f\u65b9\u5f62\uff0c\u5e76\u8d4b\u4e88\u8be5\u957f\u65b9\u5f62\u4e24\u8fb9\u957f\n public Director(double s1, double s2) {\n this.s1 = s1;\n this.s2 = s2;\n }\n\/\/\u9762\u79ef\n public double area() {\n return s1 * s2;\n }\n\/\/\u5468\u957f\n public double longer() {\n \/\/ TODO Auto-generated method stub\n return 2 * (s1 + s2);\n }\n}\n\/\/\u6d4b\u8bd5\u7c7b\npublic class Test {\n \/**\n * @param args\n *\/\n public static void main(String[] args) {\n Shape triangle = new Triangle(3, 4, 8);\n \/\/ \u65b0\u5efa\u4e00\u4e2a\u4e09\u8fb9\u957f\u4e3a3\uff0c4\uff0c5\u7684\u4e09\u89d2\u5f62\n Shape tri = new Triangle(3, 4, 5);\n Shape director = new Director(10, 20);\n \/\/ \u65b0\u5efa\u4e00\u4e2a\u4e24\u8fb9\u957f\u4e3a10,20\u7684\u957f\u65b9\u5f62\n System.out.println(\"\u4e09\u89d2\u5f62triangle\u7684\u5468\u957f\u4e3a\uff1a\" + triangle.longer());\n System.out.println(\"\u4e09\u89d2\u5f62triangle\u7684\u9762\u79ef\u4e3a\uff1a\" + triangle.area());\n System.out.println(\"\u4e09\u89d2\u5f62tri\u7684\u5468\u957f\u4e3a\uff1a\" + tri.longer());\n System.out.println(\"\u4e09\u89d2\u5f62tri\u7684\u9762\u79ef\u4e3a\uff1a\" + tri.area());\n System.out.println(\"\u8be5\u957f\u65b9\u5f62\u7684\u5468\u957f\u4e3a\uff1a\" + director.longer());\n System.out.println(\"\u8be5\u957f\u65b9\u5f62\u7684\u9762\u79ef\u4e3a\uff1a\" + director.area());\n }\n}<\/pre><\/p>\n","protected":false},"excerpt":{"rendered":"\u7b2c\u4e8c\u5355\u5143\u4efb\u52a1\u4e94\u5b9e\u8bad\uff1a\u901a\u8fc7\u7a0b\u5e8f\u8bbe\u8ba1\u51e0\u4f55\u56fe\u5f62\u63a5\u53e3\uff08Shape\uff09\uff0c\u5b9e\u73b0\u7c7b\u77e9\u5f62\uff08Rectangle\uff09\u3001\u5706\u5f62\uff08Circl […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[130],"tags":[129],"class_list":["post-472","post","type-post","status-publish","format-standard","hentry","category-java","tag-java"],"_links":{"self":[{"href":"https:\/\/199604.com\/wp-json\/wp\/v2\/posts\/472","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/199604.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/199604.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/199604.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/199604.com\/wp-json\/wp\/v2\/comments?post=472"}],"version-history":[{"count":0,"href":"https:\/\/199604.com\/wp-json\/wp\/v2\/posts\/472\/revisions"}],"wp:attachment":[{"href":"https:\/\/199604.com\/wp-json\/wp\/v2\/media?parent=472"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/199604.com\/wp-json\/wp\/v2\/categories?post=472"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/199604.com\/wp-json\/wp\/v2\/tags?post=472"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}