\u4e00\u7ef4 map + \u7ec4\u5408 key<\/li>\n<\/ul>\n\u5728\u90a3\u7bc7\u6587\u7ae0\u91cc\uff0c\u7531\u4e8e\u591a\u4e2a\u5c5e\u6027\u90fd\u662f int\uff0c\u6700\u7ec8\u9009\u62e9\u4e86\u7ec4\u5408 key \u7684\u65b9\u6848\u3002<\/p>\n
\u90a3\u4e48\uff0c\u5982\u679c\u591a\u4e2a\u5c5e\u6027\u4e0d\u6b62\u662f int\uff0c\u8fd8\u6709 String\uff0c\u8be5\u600e\u4e48\u5904\u7406\u5462\uff1f\u591a\u7ef4 map \u548c \u4e00\u7ef4 map \u5982\u4f55\u53d6\u820d\u5462\uff1f<\/p>\n
\u591a\u7ef4 map<\/h2>\n
guava \u63d0\u4f9b\u4e86 Table \u63a5\u53e3\uff0c\u5b9e\u9645\u4e0a\u662f\u4e2a\u4e8c\u7ef4 map\uff0c\u67e5\u770b guava \u7684\u6e90\u7801\u53ef\u4ee5\u53d1\u73b0\uff0c\u8fd9\u4e2a Table \u8fd8\u662f\u5f88\u91cd\u91cf\u7ea7\u7684\uff0c\u5982\u679c\u4f60\u7684\u9700\u6c42\u4ec5\u4ec5\u662f put()<\/code>\uff0c get()<\/code>\uff0c\u90a3\u6211\u4e0d\u5efa\u8bae\u4f7f\u7528 Table<\/p>\n\u4e00\u7ef4 map + \u7ec4\u5408 key<\/h2>\n
\u6240\u4ee5\u672c\u6587\u4e3b\u8981\u7814\u7a76\u7ec4\u5408 key \u7684\u60c5\u51b5\uff0c\u5e76\u63d0\u51fa\u4e00\u4e2a\u4e13\u7528\u4e8e\u7ec4\u5408 key \u7684\u5bf9\u8c61\uff1a KO<\/strong>\uff0c\u542b\u4e49\u4e3a key object<\/strong><\/p>\nKO<\/h2>\n
\u4e00\u4e2a\u6807\u51c6\u7684 KO \u5e94\u8be5\u6ee1\u8db3\u5982\u4e0b\u6761\u4ef6<\/p>\n
\n- \u7ee7\u627f\u81ea Object\uff0c\u4e14\u4e3a final \u7c7b<\/li>\n
- \u5fc5\u987b\u63d0\u4f9b\u5e26\u53c2\u6570\u7684\u6784\u9020\u65b9\u6cd5\uff0c\u4e14\u8be5\u65b9\u6cd5\u4e3a\u552f\u4e00\u7684\u6784\u9020\u65b9\u6cd5<\/li>\n
- \u5efa\u8bae\u4f7f\u7528\u9759\u6001\u5de5\u5382\u65b9\u6cd5\u6765\u521b\u5efa\u5b9e\u4f8b\uff0c\u6b64\u65f6\u6784\u9020\u65b9\u6cd5\u5e94\u4e3a\u79c1\u6709\u7684<\/li>\n
- \u5728\u6784\u9020\u65b9\u6cd5\u91cc\u8ba1\u7b97\u51fa hashcode<\/li>\n
- \u7c7b\u5c5e\u6027\u662f final \u7684<\/li>\n
- \u5fc5\u987b\u91cd\u5199 hashCode()\uff0c equals()<\/li>\n
- \u5efa\u8bae\u91cd\u5199 toString()<\/li>\n<\/ul>\n
\u793a\u4f8b\uff1a\u4e00\u4e2a\u7ec4\u5408 imei(\u6574\u6570)\uff0csn(\u5b57\u7b26\u4e32)\u7684 KO<\/p>\n
import java.util.Objects;\n\npublic final class ImeiSnKo {\n\n private final Long imei;\n private final String sn;\n private final int hashCode;\n\n public static final ImeiSnKo create(Long imei, String sn) {\n return new ImeiSnKo(imei, sn);\n }\n\n private ImeiSnKo(Long imei, String sn) {\n this.imei = imei;\n this.sn = sn;\n this.hashCode = 31 * Objects.hashCode(imei) + Objects.hashCode(sn);\n }\n\n @Override\n public int hashCode() {\n return hashCode;\n }\n\n @Override\n public boolean equals(Object obj) {\n if (this == obj) {\n return true;\n }\n if (obj instanceof ImeiSnKo) {\n ImeiSnKo ko = (ImeiSnKo) obj;\n return Objects.equals(imei, ko.imei) && Objects.equals(sn, ko.sn);\n }\n return false;\n }\n}<\/code><\/pre>\nKO \u7684\u4f18\u52bf<\/h2>\n
\u548c\u62fc\u63a5\u5b57\u7b26\u4e32\u6784\u9020 key \u6765\u5bf9\u6bd4<\/p>\n
![\"\"](\"https:\/\/static.refusea.com\/2020\/12\/ko.jpg\")
<\/p>\n