{"id":124,"date":"2015-04-01T16:49:26","date_gmt":"2015-04-01T08:49:26","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=124"},"modified":"2026-08-18T12:09:27","modified_gmt":"2026-08-18T04:09:27","slug":"java%e6%8e%a5%e5%8f%a3interface%e7%9a%84%e6%a6%82%e5%bf%b5%e5%8f%8a%e4%bd%bf%e7%94%a8","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=124","title":{"rendered":"Java\u63a5\u53e3(interface)\u7684\u6982\u5ff5\u53ca\u4f7f\u7528"},"content":{"rendered":"
\n

\u62bd\u8c61\u7c7b\u91cc\u53ef\u4ee5\u6709\u62bd\u8c61\u65b9\u6cd5\uff0c\u4e5f\u53ef\u4ee5\u6709\u5df2\u7ecf\u5b9e\u73b0\u7684\u65b9\u6cd5\uff1b\u63a5\u53e3\uff08interface\uff09\u66f4\u201c\u62bd\u8c61\u201d\uff1a\u4f20\u7edf\u4e0a\u5b83\u89c4\u5b9a\u4e00\u4e2a\u7c7b\u5fc5\u987b\u505a\u4ec0\u4e48<\/strong>\uff0c\u800c\u4e0d\u89c4\u5b9a\u600e\u4e48\u505a\u3002<\/p>\n

\u63a5\u53e3\u7528 interface<\/code> \u58f0\u660e\uff0c\u53ef\u4ee5\u770b\u6210\u4e00\u79cd\u7279\u6b8a\u7684\u62bd\u8c61\u7c7b\u3002Java 8 \u8d77\u63a5\u53e3\u4e5f\u53ef\u4ee5\u6709 default \/ static \u65b9\u6cd5\uff0cJava 9 \u8fd8\u53ef\u4ee5\u6709 private \u65b9\u6cd5\uff1b\u5165\u95e8\u4ecd\u5e94\u5148\u638c\u63e1\u201c\u5e38\u91cf + \u62bd\u8c61\u65b9\u6cd5\u201d\u8fd9\u4e00\u7ecf\u5178\u5f62\u6001\u3002<\/p>\n

<\/p>\n

\u73b0\u5b9e\u91cc\u4e5f\u6709\u63a5\u53e3\uff1aSerial ATA \u59d4\u5458\u4f1a\u5236\u5b9a Serial ATA 2.0 \u89c4\u8303\uff0c\u81ea\u5df1\u4e0d\u751f\u4ea7\u786c\u76d8\u3002\u5e0c\u6377\u3001\u65e5\u7acb\u3001\u4e09\u661f\u6309\u89c4\u8303\u505a\u76d8\uff0c\u5c31\u53ef\u4ee5\u4e92\u6362\u2014\u2014160G \u65e5\u7acb\u4e32\u53e3\u76d8\u6362\u6210 320G \u5e0c\u6377\u4e32\u53e3\u76d8\uff0c\u63d2\u4e0a\u5c31\u80fd\u7ee7\u7eed\u7528\u3002<\/p>\n\n\n\n\n\n\n\n\n
\u70b9<\/th>\n\u63a5\u53e3\u89c4\u5219<\/th>\n<\/tr>\n<\/thead>\n
\u5b57\u6bb5<\/td>\n\u9ed8\u8ba4 public static final\uff0c\u5fc5\u987b\u663e\u5f0f\u521d\u59cb\u5316<\/td>\n<\/tr>\n
\u65b9\u6cd5\uff08\u7ecf\u5178\uff09<\/td>\n\u9ed8\u8ba4 public abstract\uff0c\u4e0d\u80fd\u6709\u65b9\u6cd5\u4f53<\/td>\n<\/tr>\n
\u6784\u9020 \/ new<\/td>\n\u6ca1\u6709\u6784\u9020\u65b9\u6cd5\uff0c\u4e0d\u80fd\u76f4\u63a5\u5b9e\u4f8b\u5316<\/td>\n<\/tr>\n
\u7ee7\u627f<\/td>\n\u63a5\u53e3\u53ef\u7ee7\u627f\u591a\u4e2a\u63a5\u53e3\uff1b\u7c7b\u53ef\u5b9e\u73b0\u591a\u4e2a\u63a5\u53e3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u4e00\u3001\u58f0\u660e\u63a5\u53e3<\/h2>\n

\u7528\u4ee3\u7801\u6a21\u62df\u59d4\u5458\u4f1a\u5b9a\u4e49\u7684\u4e32\u53e3\u786c\u76d8\u63a5\u53e3\u3002\u6e90\u6587\u4ef6\u91cc\u53ef\u4ee5\u5b9a\u4e49\u591a\u4e2a\u7c7b\u6216\u63a5\u53e3\uff0c\u4f46\u6700\u591a\u4e00\u4e2a public\uff0c\u6709\u7684\u8bdd\u6587\u4ef6\u540d\u5fc5\u987b\u548c\u5b83\u540c\u540d\u3002\u63a5\u53e3\u4e4b\u95f4\u4e5f\u53ef\u4ee5\u7ee7\u627f\uff0c\u5b50\u63a5\u53e3\u62ff\u5230\u7236\u63a5\u53e3\u7684\u5e38\u91cf\u548c\u62bd\u8c61\u65b9\u6cd5\uff0c\u518d\u8ffd\u52a0\u81ea\u5df1\u7684\u3002<\/p>\n

public interface SataHdd {\n    public static final int CONNECT_LINE = 4;  \/\/ \u8fde\u63a5\u7ebf\u6570\u91cf\n    public void writeData(String data);\n    public String readData();\n}<\/code><\/pre>\n
\u6210\u5458\u53d8\u91cf\u9ed8\u8ba4\u5c31\u662f public static final\uff0c\u58f0\u660e\u65f6\u5e38\u91cf\u4fee\u9970\u7b26\u53ef\u4ee5\u7701\u7565\uff0c\u4f46\u5fc5\u987b\u663e\u5f0f\u8d4b\u521d\u503c\u3002\u4e0b\u9762\u8fd9\u4e9b\u5199\u6cd5\u4f1a\u7f16\u8bd1\u51fa\u9519\uff1a\u672a\u521d\u59cb\u5316\u7684\u5b57\u6bb5\u3001protected \u65b9\u6cd5\u3001\u5e26\u65b9\u6cd5\u4f53\u7684\u9759\u6001\u65b9\u6cd5\uff08Java 8 \u4ee5\u524d\uff09\u3002<\/p>\n
public interface SataHdd {\n    public int connectLine;           \/\/ \u51fa\u9519\uff1a\u88ab\u770b\u6210\u9759\u6001\u5e38\u91cf\uff0c\u5fc5\u987b\u521d\u59cb\u5316\n    protected void writeData(String data);  \/\/ \u51fa\u9519\uff1a\u5fc5\u987b\u662f public\n    public static String readData() {       \/\/ Java 8 \u524d\u51fa\u9519\uff1a\u4e0d\u80fd\u6709\u65b9\u6cd5\u4f53\n        return \"\u6570\u636e\";\n    }\n}<\/code><\/pre>\n
\u4e00\u4e2a\u63a5\u53e3\u4e0d\u201c\u5b9e\u73b0\u201d\u53e6\u4e00\u4e2a\u63a5\u53e3\uff0c\u4f46\u53ef\u4ee5\u540c\u65f6\u7ee7\u627f\u591a\u4e2a\u63a5\u53e3\uff0c\u7528\u6765\u8865\u4e0a\u7c7b\u7684\u5355\u7ee7\u627f\u9650\u5236\uff1a<\/p>\n
public interface SataHdd extends A, B {\n    public static final int CONNECT_LINE = 4;\n    public void writeData(String data);\n    public String readData();\n}\ninterface A { public void a(); }\ninterface B { public void b(); }<\/code><\/pre>\n
\u4e8c\u3001\u4e3a\u4ec0\u4e48\u4f7f\u7528\u63a5\u53e3<\/h2>\n
\u5927\u578b\u9879\u76ee\u91cc\u53ef\u80fd\u8981\u4ece\u7ee7\u627f\u94fe\u4e2d\u95f4\u63d2\u5165\u80fd\u529b\uff1aA \u2192 B \u2192 C \u2192 D \u2192 E\u3002\u82e5\u53ea\u60f3\u7ed9 C\u3001D\u3001E \u52a0\u529f\u80fd\uff0c\u6700\u7b80\u5355\u662f\u8ba9 C \u518d\u7ee7\u627f\u53e6\u4e00\u4e2a\u7c7b\uff0c\u4f46 Java \u5355\u7ee7\u627f\u505a\u4e0d\u5230\uff1b\u628a\u65b0\u7236\u7c7b\u6302\u5230 A \u4e0a\uff0c\u53c8\u4f1a\u6539\u52a8\u6574\u6761\u94fe\uff0c\u6ca1\u6709\u53ef\u63d2\u5165\u6027\u3002<\/p>\n
\u63a5\u53e3\u662f\u53ef\u63d2\u5165\u6027\u7684\u4fdd\u8bc1\u3002\u7ee7\u627f\u94fe\u4e0a\u4efb\u4f55\u4e00\u4e2a\u7c7b\u90fd\u53ef\u4ee5 implements \u4e00\u4e2a\u63a5\u53e3\uff0c\u53ea\u5f71\u54cd\u5b83\u81ea\u5df1\u548c\u5b50\u7c7b\uff0c\u4e0d\u5f71\u54cd\u7236\u7c7b\u3002\u6211\u4eec\u5173\u5fc3\u7684\u4e0d\u662f\u54ea\u4e00\u4e2a\u5177\u4f53\u7c7b\uff0c\u800c\u662f\u5b83\u6709\u6ca1\u6709\u5b9e\u73b0\u6211\u4eec\u9700\u8981\u7684\u63a5\u53e3\u3002\u7cfb\u7edf\u8d8a\u5927\u3001\u6d3b\u5f97\u8d8a\u4e45\uff0c\u63a5\u53e3\u8d8a\u80fd\u4fdd\u4f4f\u7075\u6d3b\u6027\u548c\u53ef\u6269\u5c55\u6027\u3002\u8bbe\u8ba1\u9636\u6bb5\u6700\u91cd\u8981\u7684\u4efb\u52a1\u4e4b\u4e00\uff0c\u5c31\u662f\u5148\u753b\u51fa\u5404\u90e8\u5206\u63a5\u53e3\uff0c\u518d\u7ec4\u5408\u51fa\u6846\u67b6\u3002<\/p>\n
\u4e09\u3001\u7528\u7c7b\u5b9e\u73b0\u63a5\u53e3<\/h2>\n
\u4e0d\u80fd new<\/code> \u63a5\u53e3\uff0c\u5fc5\u987b\u7531\u7c7b implements<\/code> \u62bd\u8c61\u65b9\u6cd5\u518d\u5b9e\u4f8b\u5316\u3002\u4e00\u4e2a\u7c7b\u5b9e\u73b0\u4e0d\u4e86\u5168\u90e8\u62bd\u8c61\u65b9\u6cd5\uff0c\u5c31\u5fc5\u987b\u628a\u81ea\u5df1\u58f0\u660e\u4e3a\u62bd\u8c61\u7c7b<\/strong>\u3002\u5141\u8bb8\u5b9a\u4e49\u63a5\u53e3\u7c7b\u578b\u7684\u5f15\u7528\uff0c\u6307\u5411\u5b9e\u73b0\u7c7b\u5b9e\u4f8b\u3002\u4e00\u4e2a\u7c7b\u53ea\u80fd\u7ee7\u627f\u4e00\u4e2a\u7236\u7c7b\uff0c\u4f46\u53ef\u4ee5\u5b9e\u73b0\u591a\u4e2a\u63a5\u53e3\u3002<\/p>\n
\u683c\u5f0f\uff1a\u4fee\u9970\u7b26 class \u7c7b\u540d extends \u7236\u7c7b implements \u63a5\u53e31, \u63a5\u53e32 { \u2026 }<\/code><\/p>\n
import static java.lang.System.*;\npublic class Demo {\n    public static void main(String[] args) {\n        SataHdd sh1 = new SeagateHdd();\n        SataHdd sh2 = new SamsungHdd();\n        sh1.writeData(\"demo\");\n        sh2.writeData(\"demo\");\n    }\n}\ninterface SataHdd {\n    public static final int CONNECT_LINE = 4;\n    public void writeData(String data);\n    public String readData();\n}\ninterface fixHdd {\n    String address = \"\u5317\u4eac\u5e02\u6d77\u6dc0\u533a\";\n    boolean doFix();\n}\nclass SeagateHdd implements SataHdd, fixHdd {\n    public String readData() { return \"\u6570\u636e\"; }\n    public void writeData(String data) { out.println(\"\u5199\u5165\u6210\u529f\"); }\n    public boolean doFix() { return true; }\n}\nclass SamsungHdd implements SataHdd {\n    public String readData() { return \"\u6570\u636e\"; }\n    public void writeData(String data) { out.println(\"\u5199\u5165\u6210\u529f\"); }\n}\nabstract class XXHdd implements SataHdd {\n    public String readData() { return \"\u6570\u636e\"; }\n    \/\/ \u6ca1\u6709\u5b9e\u73b0 writeData\uff0c\u6240\u4ee5\u5fc5\u987b\u662f\u62bd\u8c61\u7c7b\n}<\/code><\/pre>\n
\u56db\u3001\u63a5\u53e3\u4f5c\u4e3a\u7c7b\u578b<\/h2>\n
\u4efb\u4f55\u5b9e\u73b0\u8be5\u63a5\u53e3\u7684\u5b9e\u4f8b\u90fd\u53ef\u4ee5\u5b58\u5728\u63a5\u53e3\u7c7b\u578b\u7684\u53d8\u91cf\u91cc\u3002\u901a\u8fc7\u8fd9\u4e2a\u53d8\u91cf\u8c03\u7528\u7684\u662f\u63a5\u53e3\u91cc\u58f0\u660e\u7684\u65b9\u6cd5\uff0c\u8fd0\u884c\u65f6\u52a8\u6001\u7ed1\u5b9a\u5230\u5b9e\u73b0\u7c7b\u3002\u63a5\u53e3\u4e5f\u53ef\u4ee5\u5f53\u65b9\u6cd5\u53c2\u6570\u548c\u8fd4\u56de\u7c7b\u578b\u3002<\/p>\n
public class Demo {\n    public void test1(A a) {\n        a.doSth();\n    }\n    public static void main(String[] args) {\n        Demo d = new Demo();\n        A a = new B();\n        d.test1(a);\n    }\n}\ninterface A {\n    public int doSth();\n}\nclass B implements A {\n    public int doSth() {\n        System.out.println(\"now in B\");\n        return 123;\n    }\n}<\/code><\/pre>\n
\u8fd0\u884c\u7ed3\u679c\uff1anow in B\u3002<\/p>\n
\n
\u4e00\u53e5\u8bdd\u603b\u7ed3\uff1a\u63a5\u53e3\u89c4\u5b9a\u5fc5\u987b\u505a\u4ec0\u4e48\uff1b\u7c7b\u53bb implements\uff0c\u5f15\u7528\u5199\u6210\u63a5\u53e3\u7c7b\u578b\uff0c\u6362\u5b9e\u73b0\u5c31\u50cf\u6362\u4e00\u5757\u7b26\u5408\u540c\u4e00\u89c4\u8303\u7684\u786c\u76d8\u3002<\/strong><\/p>\n<\/blockquote>\n<\/section>\n","protected":false},"excerpt":{"rendered":"
\u62bd\u8c61\u7c7b\u91cc\u53ef\u4ee5\u6709\u62bd\u8c61\u65b9\u6cd5\uff0c\u4e5f\u53ef\u4ee5\u6709\u5df2\u7ecf\u5b9e\u73b0\u7684\u65b9\u6cd5\uff1b\u63a5\u53e3\uff08interface\uff09\u66f4\u201c\u62bd\u8c61\u201d\uff1a\u4f20\u7edf\u4e0a\u5b83\u89c4\u5b9a\u4e00\u4e2a\u7c7b\u5fc5\u987b\u505a […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[17],"tags":[43,40],"_links":{"self":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/124"}],"collection":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=124"}],"version-history":[{"count":2,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/124\/revisions"}],"predecessor-version":[{"id":327,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/124\/revisions\/327"}],"wp:attachment":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=124"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=124"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=124"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}