{"id":233,"date":"2024-01-22T20:55:43","date_gmt":"2024-01-22T12:55:43","guid":{"rendered":"https:\/\/forelink.top\/?p=233"},"modified":"2024-01-22T21:28:05","modified_gmt":"2024-01-22T13:28:05","slug":"java-%ef%bc%88final-%e6%8a%bd%e8%b1%a1%e7%b1%bb-%e6%8e%a5%e5%8f%a3%ef%bc%89","status":"publish","type":"post","link":"https:\/\/forelink.top\/index.php\/2024\/01\/22\/java-%ef%bc%88final-%e6%8a%bd%e8%b1%a1%e7%b1%bb-%e6%8e%a5%e5%8f%a3%ef%bc%89\/","title":{"rendered":"Java \uff08Final \u62bd\u8c61\u7c7b \u63a5\u53e3\uff09"},"content":{"rendered":"\n

\u6700\u7ec8\u7c7b(final)<\/p>\n\n\n\n

final\u4fee\u9970\u7684\u7c7b\u4e3a\u6700\u7ec8\u7c7b\uff0c\u4e0d\u80fd\u88ab\u7ee7\u627f\u3002
\u4fee\u9970\u7684\u65b9\u6cd5\u4e3a\u6700\u7ec8\u65b9\u6cd5\uff0c\u4e0d\u80fd\u88ab\u91cd\u5199\u3002
\u4fee\u9970\u7684\u53d8\u91cf\u4e3a\u6700\u7ec8\u53d8\u91cf\uff0c\u4ec5\u53ef\u5728\u58f0\u660e\u65f6\u8fdb\u884c\u4e00\u6b21\u8d4b\u503c\u3002<\/p>\n\n\n\n

public final class a{}\n\/\/\u4e0d\u53ef\u88ab\u7ee7\u627f\npublic final void run(){}\n\/\/\u4e0d\u53ef\u88ab\u91cd\u5199\npublic final double discount = 0.7;\n\/\/\u4e0d\u53ef\u91cd\u65b0\u8d4b\u503c<\/code><\/pre>\n\n\n\n
\u7528static final\u4fee\u9970\u7684\u53d8\u91cf\u4e3a\u5e38\u91cf\uff0c\u4e0d\u80fd\u88ab\u4fee\u6539\u3002
\u4ee3\u7801\u53ef\u8bfb\u6027\u66f4\u597d\uff0c\u66f4\u6613\u4e8e\u7ef4\u62a4\u3002
\u7a0b\u5e8f\u7f16\u8bd1\u540e\uff0c\u5e38\u91cf\u4f1a\u88ab\u5b8f\u66ff\u6362\u6210\u5b57\u9762\u91cf -> \u4f7f\u7528\u4e2d\u5e38\u91cf\u548c\u5b57\u9762\u91cf\u7684\u6548\u7387\u662f\u4e00\u6837\u7684\u3002
<\/p>\n\n\n\n
\u62bd\u8c61\u7c7b\uff08abstract\uff09<\/p>\n\n\n\n
\u62bd\u8c61\u7c7b\u53ef\u4ee5\u6709\u6240\u6709\u7c7b\u80fd\u591f\u5305\u542b\u7684\u6210\u5458\uff08\u53d8\u91cf\u3001\u65b9\u6cd5\u3001\u6784\u9020\u5668\uff09
\u62bd\u8c61\u7c7b\u4e0d\u80fd\u521b\u5efa\u5bf9\u8c61\uff0c\u4ec5\u4f5c\u4e3a\u4e00\u79cd\u7279\u6b8a\u7684\u7236\u7c7b\uff0c\u8ba9\u5b50\u7c7b\u7ee7\u627f\u5e76\u5b9e\u73b0\u3002
\u62bd\u8c61\u7c7b\u4e2d\u6709abstract\u4fee\u9970\u7684\u65b9\u6cd5\u4e3a\u62bd\u8c61\u65b9\u6cd5\uff0c\u4e0d\u80fd\u5199\u65b9\u6cd5\u4f53\uff08\u4ec5\u6709\u65b9\u6cd5\u540d\uff0c\u7ee7\u627f\u62bd\u8c61\u65b9\u6cd5\u7684\u7c7b\u5fc5\u987b\u91cd\u5199\u62bd\u8c61\u65b9\u6cd5\uff0c\u5426\u5219\u8be5\u7c7b\u4e5f\u4e3a\u62bd\u8c61\u7c7b\uff09<\/p>\n\n\n\n
\u8bbe\u8ba1\u62bd\u8c61\u7c7b\u80fd\u66f4\u597d\u7684\u5b9e\u73b0\u884c\u4e3a\u591a\u6001\u3002<\/p>\n\n\n\n
public abstract class book{\n    private String name;\n    private int page;\n    public abstract void COUNT_WORD();\n\/\/getter setter \u5ffd\u7565\n}\n\npublic class Educated extends book(){\n     public void COUNT_WORD(){\n        System.out.println(\"3760450 words included\");\n     }\n     \/\/\u5fc5\u987b\u91cd\u5199\u62bd\u8c61\u65b9\u6cd5\u3002\n}<\/code><\/pre>\n\n\n\n
\u63a5\u53e3(interface and implements)<\/p>\n\n\n\n
\u7528interface\u5173\u952e\u5b57\u53ef\u4ee5\u5b9a\u4e49\u51fa\u4e00\u79cd\u7279\u6b8a\u7684\u7ed3\u6784 \u63a5\u53e3\uff1a<\/p>\n\n\n\n
public interface circle{\n     \/*public static final*\/int pi = 3.1415926;\/\/\u9ed8\u8ba4\u4e3a\u5e38\u91cf\n     \/*public abstract*\/void COUNT_LENGTH();\/\/\u9ed8\u8ba4\u4e3a\u62bd\u8c61\u65b9\u6cd5\n     \/\/\u4e0d\u80fd\u6709\u6784\u9020\u5668\u548c\u4ee3\u7801\u5757{}\uff1b\n}<\/code><\/pre>\n\n\n\n
\u63a5\u53e3\u4e2d\u7684\u53d8\u91cf\u9ed8\u8ba4\u662f\u5e38\u91cf\uff0c\u65b9\u6cd5\u9ed8\u8ba4\u662f\u62bd\u8c61\u65b9\u6cd5\uff0c\u4e0d\u80fd\u6709\u6784\u9020\u5668\u3002\u7528\u63a5\u53e3\u4e0d\u80fd\u521b\u5efa\u5bf9\u8c61\u3002<\/p>\n\n\n\n
\u7c7b\u53ef\u4ee5\u7528\u63a5\u53e3\u5b9e\u73b0(implement)\u4e00\u4e9b\u63a5\u53e3\u5185\u7684\u529f\u80fd\uff0c\u5b9e\u73b0\u63a5\u53e3\u7684\u7c7b\u79f0\u4e3a \u5b9e\u73b0\u7c7b\u3002
\u4e00\u4e2a\u7c7b\u53ef\u4ee5\u5b9e\u73b0\u591a\u4e2a\u63a5\u53e3\uff0c\u5f25\u8865\u4e86\u5b50\u7c7b\u53ea\u80fd\u7ee7\u627f\u4e00\u4e2a\u7c7b\u7684\u4e0d\u8db3\u3002\u652f\u6301\u9762\u5411\u63a5\u53e3\u7f16\u7a0b\u3002<\/p>\n\n\n\n
public class house implements door,light{\n     int light_switch=0;\n     public void open(){\n       System.out.println(\"Door opened!\");\n     }\n     public void close(){\n       System.out.println(\"Door closed!\");\n     }\n     public void switch_(){\n       light_switch = (light_switch==0? 1 :);\n}\npublic interface door{\n   void open();\n   void close();\n}\npublic interface light{\n\n   void switch_();\n}<\/code><\/pre>\n\n\n\n
\u4f7f\u7528\u63a5\u53e3\u80fd\u7075\u6d3b\u5207\u6362\u5404\u79cd\u5b9e\u73b0\u3002<\/p>\n\n\n\n
\u63a5\u53e3\u5728jdk8\u540e\u65b0\u589e\u7684\u4e09\u79cd\u65b9\u6cd5\uff1a<\/p>\n\n\n\n
\u9ed8\u8ba4\u65b9\u6cd5\uff1a\u7528default\u4fee\u9970\uff0c\u9ed8\u8ba4\u7528public\u4fee\u9970\uff08\u9700\u8981\u88ab\u9891\u7e41\u8c03\u7528\uff09\uff0c\u9700\u8981\u5e26\u65b9\u6cd5\u4f53\uff0c\u662f\u5b9e\u4f8b\u65b9\u6cd5\uff0c\u53ef\u4ee5\u7528\u5b9e\u73b0\u7c7b\u521b\u5efa\u7684\u5bf9\u8c61\u8c03\u7528\u3002
\u79c1\u6709\u65b9\u6cd5\uff1a\u4ecejdk9\u5f00\u59cb\u652f\u6301\uff01\u7528private\u4fee\u9970\uff0c\u9700\u8981\u5e26\u65b9\u6cd5\u4f53\uff0c\u662f\u5b9e\u4f8b\u65b9\u6cd5\uff0c\u53ef\u4ee5\u7528\u9ed8\u8ba4\u65b9\u6cd5\u8bbf\u95ee\u79c1\u6709\u65b9\u6cd5\uff0c\u6216\u5728\u5176\u4ed6\u79c1\u6709\u65b9\u6cd5\u4e2d\u8bbf\u95ee\u79c1\u6709\u65b9\u6cd5\u3002
\u9759\u6001\u65b9\u6cd5\uff1a\u7528static\u4fee\u9970\uff0c\u9ed8\u8ba4\u7528public\u4fee\u9970\u9700\u8981\u5e26\u65b9\u6cd5\u4f53\uff0c\u4ec5\u63a5\u53e3\u5185\u90e8\u53ef\u8c03\u7528\u3002<\/p>\n\n\n\n
\u4f7f\u7528\u65b0\u589e\u65b9\u6cd5\uff0c\u4e0d\u7528\u5c06\u6bcf\u4e2a\u8c03\u7528\u63a5\u53e3\u7684\u7c7b\u90fd\u91cd\u5199\u4e00\u904d\u65b9\u6cd5\uff0c\u4ec5\u8c03\u7528\u5373\u53ef\uff0c\u964d\u4f4e\u6269\u5c55\u4e0e\u7ef4\u62a4\u6210\u672c\u3002<\/p>\n\n\n\n
\u63a5\u53e3\u7684\u591a\u7ee7\u627f\uff1a\u4e00\u4e2a\u63a5\u53e3\u53ef\u4ee5\u7ee7\u627f\u591a\u4e2a\u63a5\u53e3
<\/p>\n\n\n\n
public interface a{}\npublic interface b{}\npublic interface c{}\n\npublic interface d extends a,b,c{}\n\/\/d\u80fd\u591f\u5408\u5e76abc\u63a5\u53e3\u7684\u6240\u6709\u529f\u80fd\uff0c\u7b80\u5355\u9ad8\u6548\u3002\n<\/code><\/pre>\n\n\n\n
\u4f7f\u7528\u63a5\u53e3\u7684\u6ce8\u610f\u4e8b\u9879\uff1a<\/p>\n\n\n\n
    \n
  1. \u4e00\u4e2a\u7c7b \/ \u63a5\u53e3\u7ee7\u627f\u591a\u4e2a\u63a5\u53e3\u65f6\uff0c\u82e5\u4e0d\u540c\u63a5\u53e3\u5b58\u5728\u65b9\u6cd5\u7b7e\u540d\uff08\u65b9\u6cd5\u540d\u548c\u8fd4\u56de\u503c\uff09\u51b2\u7a81\uff0c\u5219\u4e0d\u80fd\u8fdb\u884c\u7ee7\u627f\u3002<\/li>\n\n\n\n
  2. \u5982\u679c\u4e00\u4e2a\u7c7b\u7ee7\u627f\u4e86\u7236\u7c7b\u5b9e\u73b0\u4e86\u63a5\u53e3\uff0c\u7236\u7c7b\u548c\u63a5\u53e3\u5b58\u5728\u76f8\u540c\u7684\u65b9\u6cd5\uff0c\u4f1a\u4f18\u5148\u4f7f\u7528\u7236\u7c7b\u7684\u65b9\u6cd5\u3002<\/li>\n\n\n\n
  3. \u5982\u679c\u4e00\u4e2a\u7c7b\u5b9e\u73b0\u7684\u591a\u4e2a\u63a5\u53e3\u6709\u91cd\u540d\u7684\u9ed8\u8ba4\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5728\u7c7b\u4e2d\u76f4\u63a5\u91cd\u5199\u65b9\u6cd5\u3002<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"
    \u6700\u7ec8\u7c7b(final) final\u4fee\u9970\u7684\u7c7b\u4e3a\u6700\u7ec8\u7c7b\uff0c\u4e0d\u80fd\u88ab\u7ee7\u627f\u3002\u4fee\u9970\u7684\u65b9\u6cd5\u4e3a\u6700\u7ec8\u65b9\u6cd5\uff0c\u4e0d\u80fd\u88ab\u91cd\u5199\u3002\u4fee\u9970\u7684\u53d8\u91cf\u4e3a\u6700 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[21],"tags":[],"class_list":["post-233","post","type-post","status-publish","format-standard","hentry","category-java"],"_links":{"self":[{"href":"https:\/\/forelink.top\/index.php\/wp-json\/wp\/v2\/posts\/233","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/forelink.top\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/forelink.top\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/forelink.top\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/forelink.top\/index.php\/wp-json\/wp\/v2\/comments?post=233"}],"version-history":[{"count":3,"href":"https:\/\/forelink.top\/index.php\/wp-json\/wp\/v2\/posts\/233\/revisions"}],"predecessor-version":[{"id":238,"href":"https:\/\/forelink.top\/index.php\/wp-json\/wp\/v2\/posts\/233\/revisions\/238"}],"wp:attachment":[{"href":"https:\/\/forelink.top\/index.php\/wp-json\/wp\/v2\/media?parent=233"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/forelink.top\/index.php\/wp-json\/wp\/v2\/categories?post=233"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/forelink.top\/index.php\/wp-json\/wp\/v2\/tags?post=233"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}