{"id":1597,"date":"2026-07-09T16:50:38","date_gmt":"2026-07-09T08:50:38","guid":{"rendered":"https:\/\/yunyanglib.cn\/?p=1597"},"modified":"2026-07-09T16:50:40","modified_gmt":"2026-07-09T08:50:40","slug":"%e3%80%90java%e3%80%91java-%e5%bc%80%e5%8f%91%e5%88%a9%e5%99%a8%ef%bc%9aguava-%e5%b7%a5%e5%85%b7%e7%b1%bb%e5%85%a8%e6%96%b9%e4%bd%8d%e4%bd%bf%e7%94%a8%e6%80%bb%e7%bb%93","status":"publish","type":"post","link":"https:\/\/yunyanglib.cn\/?p=1597","title":{"rendered":"\u3010Java\u3011Java \u5f00\u53d1\u5229\u5668\uff1aGuava \u5de5\u5177\u7c7b\u5168\u65b9\u4f4d\u4f7f\u7528\u603b\u7ed3"},"content":{"rendered":"\n

\u65e5\u5e38 Java \u5f00\u53d1\u8fc7\u7a0b\u4e2d\uff0c\u539f\u751f JDK \u63d0\u4f9b\u7684\u5de5\u5177\u7c7b\u591a\u591a\u5c11\u5c11\u5b58\u5728\u77ed\u677f\uff1a\u7a7a\u6307\u9488\u6cdb\u6ee5\u3001\u96c6\u5408\u521b\u5efa\u7e41\u7410\u3001\u5b57\u7b26\u4e32\u62fc\u63a5\u62c6\u5206\u4ee3\u7801\u5197\u4f59\u3001\u672c\u5730\u7f13\u5b58\u9700\u8981\u81ea\u5df1\u624b\u52a8\u5b9e\u73b0\u7b49\u95ee\u9898\u5c42\u51fa\u4e0d\u7a77\u3002Google \u5f00\u6e90\u7684Guava<\/strong>\u5de5\u5177\u5e93\u5c31\u662f\u4e3a\u4e86\u89e3\u51b3\u8fd9\u7c7b\u75db\u70b9\u800c\u751f\uff0c\u5c01\u88c5\u4e86\u5927\u91cf\u5b9e\u7528 API\uff0c\u8986\u76d6\u53c2\u6570\u6821\u9a8c\u3001\u7a7a\u503c\u5904\u7406\u3001\u589e\u5f3a\u96c6\u5408\u3001\u5b57\u7b26\u4e32\u64cd\u4f5c\u3001\u672c\u5730\u7f13\u5b58\u7b49\u9ad8\u9891\u5f00\u53d1\u573a\u666f\u3002\u4eca\u5929\u7ed3\u5408\u65e5\u5e38\u9879\u76ee\u5b9e\u6218\uff0c\u68b3\u7406 Guava \u5e38\u7528\u529f\u80fd\u4e0e\u843d\u5730\u4ee3\u7801\u3002<\/p>\n\n\n\n

\u4e00\u3001Maven \u5feb\u901f\u5f15\u5165\u4f9d\u8d56<\/h2>\n\n\n\n

\u4f7f\u7528 Guava \u7b2c\u4e00\u6b65\u5728pom.xml<\/code>\u5f15\u5165\u5750\u6807\uff0c\u9009\u7528\u7a33\u5b9a\u7248\uff1a<\/p>\n\n\n\n

<!-- Guava\u4f9d\u8d56 -->\n<dependency>\n    <groupId>com.google.guava<\/groupId>\n    <artifactId>guava<\/artifactId>\n    <version>32.1.3-jre<\/version>\n<\/dependency>\n<\/code><\/pre>\n\n\n\n
\u4e8c\u3001\u57fa\u7840\u5de5\u5177\u7c7b\uff1a\u89c4\u907f NPE \u4e0e\u53c2\u6570\u6821\u9a8c<\/h2>\n\n\n\n
1. Optional \u7a7a\u503c\u5904\u7406<\/h3>\n\n\n\n
\u539f\u751f\u4ee3\u7801\u76f4\u63a5\u4f7f\u7528null<\/code>\u6781\u6613\u5f15\u53d1\u7a7a\u6307\u9488\u5f02\u5e38\uff0cGuava \u7684Optional<\/code>\u5f3a\u5236\u5f00\u53d1\u8005\u4e3b\u52a8\u5904\u7406\u7a7a\u503c\uff0c\u675c\u7edd\u9690\u6027 NPE\u3002<\/p>\n\n\n\n
import com.google.common.base.Optional;\n\npublic class OptionalDemo {\n    public static void main(String[] args) {\n        \/\/ 1. \u521b\u5efa\u975e\u7a7a\u5bf9\u8c61\n        Optional<String> opt1 = Optional.of(\"Java-Guava\");\n        \/\/ 2. \u5141\u8bb8\u4f20\u5165null\n        Optional<String> opt2 = Optional.fromNullable(null);\n\n        \/\/ \u5224\u65ad\u662f\u5426\u6709\u503c\n        System.out.println(opt1.isPresent()); \/\/ true\n        \/\/ \u7a7a\u503c\u65f6\u8bbe\u7f6e\u9ed8\u8ba4\u8fd4\u56de\n        String res = opt2.or(\"\u9ed8\u8ba4\u5b57\u7b26\u4e32\");\n        System.out.println(res); \/\/ \u9ed8\u8ba4\u5b57\u7b26\u4e32\n    }\n}\n<\/code><\/pre>\n\n\n\n
2. Preconditions \u53c2\u6570\u524d\u7f6e\u6821\u9a8c<\/h3>\n\n\n\n
\u9879\u76ee\u5165\u53c2\u6821\u9a8c\u662f\u521a\u9700\uff0c\u539f\u751f if \u5224\u65ad\u4ee3\u7801\u81c3\u80bf\uff0cPreconditions<\/code>\u4e00\u884c\u4ee3\u7801\u5b8c\u6210\u53c2\u6570\u5408\u6cd5\u6027\u6821\u9a8c\uff0c\u4e0d\u6ee1\u8db3\u76f4\u63a5\u629b\u51fa\u5f02\u5e38\u3002<\/p>\n\n\n\n
import com.google.common.base.Preconditions;\n\npublic class PreconditionsDemo {\n    public static void getUserInfo(Integer userId){\n        \/\/ \u6821\u9a8c\u53c2\u6570\u4e0d\u80fd\u4e3anull\n        Preconditions.checkNotNull(userId,\"\u7528\u6237ID\u4e0d\u80fd\u4e3a\u7a7a\");\n        \/\/ \u6821\u9a8c\u6570\u503c\u8303\u56f4\n        Preconditions.checkArgument(userId>0,\"\u7528\u6237ID\u5fc5\u987b\u5927\u4e8e0\");\n        System.out.println(\"\u5408\u6cd5\u7528\u6237ID\uff1a\"+userId);\n    }\n\n    public static void main(String[] args) {\n        getUserInfo(10);\n        \/\/ getUserInfo(-1); \/\/ \u629b\u51faIllegalArgumentException\n    }\n}\n<\/code><\/pre>\n\n\n\n
3. \u4fbf\u6377 Object \u5de5\u5177\u65b9\u6cd5<\/h3>\n\n\n\n
JDK7 \u7684java.util.Objects<\/code>\u8bbe\u8ba1\u5927\u91cf\u53c2\u8003 Guava\uff0c\u5728\u4f4e\u7248\u672c JDK \u73af\u5883\u4e2d\u53ef\u76f4\u63a5\u4f7f\u7528 Guava \u81ea\u5e26\u7684\u5bf9\u8c61\u6bd4\u8f83\u3001\u54c8\u5e0c\u65b9\u6cd5\u3002<\/p>\n\n\n\n
\u4e09\u3001Guava \u589e\u5f3a\u96c6\u5408\uff08\u5f00\u53d1\u9ad8\u9891\u4f7f\u7528\uff09<\/h2>\n\n\n\n
Guava \u62d3\u5c55\u4e86 JDK \u6ca1\u6709\u7684\u7279\u6b8a\u96c6\u5408\uff1a\u4e0d\u53ef\u53d8\u96c6\u5408\u3001Multiset\u3001Multimap\u3001BiMap\uff0c\u540c\u65f6\u63d0\u4f9b Lists\/Sets \u4fbf\u6377\u521b\u5efa\u96c6\u5408\u3002<\/p>\n\n\n\n
1. \u4e0d\u53ef\u53d8\u96c6\u5408 Immutable<\/h3>\n\n\n\n
\u539f\u751fCollections.unmodifiableList<\/code>\u53ea\u662f\u89c6\u56fe\u5305\u88c5\uff0c\u539f\u96c6\u5408\u4fee\u6539\u540e\u89c6\u56fe\u540c\u6b65\u53d8\u5316\uff1bGuava \u4e0d\u53ef\u53d8\u96c6\u5408\u662f\u771f\u6b63\u526f\u672c\uff0c\u539f\u96c6\u5408\u6539\u52a8\u4e0d\u5f71\u54cd\u81ea\u8eab\uff0c\u5929\u751f\u7ebf\u7a0b\u5b89\u5168\uff0c\u53ef\u4f5c\u4e3a\u5e38\u91cf\u4f7f\u7528<\/strong>\u3002<\/p>\n\n\n\n
import com.google.common.collect.ImmutableList;\n\npublic class ImmutableDemo {\n    public static void main(String[] args) {\n        \/\/ \u5feb\u901f\u521b\u5efa\u4e0d\u53ef\u53d8\u96c6\u5408\n        ImmutableList<String> list = ImmutableList.of(\"MySQL\",\"Java\",\"Linux\");\n        \/\/ list.add(\"C++\"); \/\/ \u8c03\u7528add\u76f4\u63a5\u629b\u5f02\u5e38\uff0c\u4e0d\u5141\u8bb8\u4fee\u6539\n    }\n}\n<\/code><\/pre>\n\n\n\n
2. Lists \u5de5\u5177\uff1a\u7b80\u5316\u96c6\u5408\u64cd\u4f5c<\/h3>\n\n\n\n
import com.google.common.collect.Lists;\nimport java.util.List;\n\npublic class ListsDemo {\n    public static void main(String[] args) {\n        \/\/ 1.\u5feb\u901f\u521d\u59cb\u5316\u96c6\u5408\n        List<Integer> list = Lists.newArrayList(1,2,3,4,5);\n        \/\/ 2.\u96c6\u5408\u5206\u9875\uff0c\u6bcf2\u4e2a\u5143\u7d20\u5206\u4e3a\u4e00\u7ec4\n        List<List<Integer>> pageList = Lists.partition(list,2);\n        System.out.println(pageList); \/\/ [[1,2],[3,4],[5]]\n        \/\/ 3.\u96c6\u5408\u53cd\u8f6c\n        List<Integer> reverse = Lists.reverse(list);\n        System.out.println(reverse); \/\/ [5,4,3,2,1]\n    }\n}\n<\/code><\/pre>\n\n\n\n
3. Multiset\uff1a\u53ef\u91cd\u590d\u5143\u7d20\u96c6\u5408\uff0c\u5feb\u901f\u7edf\u8ba1\u9891\u6b21<\/h3>\n\n\n\n
\u666e\u901a Set \u4e0d\u5141\u8bb8\u91cd\u590d\u5143\u7d20\uff0c\u7edf\u8ba1\u5143\u7d20\u51fa\u73b0\u6b21\u6570\u9700\u8981 Map \u624b\u52a8\u8ba1\u6570\uff0cMultiset \u539f\u751f\u652f\u6301\u91cd\u590d\u5b58\u50a8 + \u8ba1\u6570\u3002<\/p>\n\n\n\n
import com.google.common.collect.Multiset;\nimport com.google.common.collect.HashMultiset;\n\npublic class MultisetDemo {\n    public static void main(String[] args) {\n        Multiset<String> multiSet = HashMultiset.create();\n        multiSet.add(\"Java\");\n        multiSet.add(\"Java\");\n        multiSet.add(\"MySQL\");\n        \/\/ \u83b7\u53d6\u6307\u5b9a\u5143\u7d20\u51fa\u73b0\u6b21\u6570\n        System.out.println(multiSet.count(\"Java\")); \/\/ 2\n    }\n}\n<\/code><\/pre>\n\n\n\n
4. Multimap\uff1a\u4e00\u952e\u5b9e\u73b0\u4e00\u4e2a key \u5bf9\u5e94\u591a\u4e2a value<\/h3>\n\n\n\n
\u539f\u751f Map<K,List<V>> \u4ee3\u7801\u7e41\u7410\uff0cMultimap \u5929\u7136\u652f\u6301\u4e00\u952e\u591a\u503c\u6620\u5c04\u3002<\/p>\n\n\n\n
import com.google.common.collect.ArrayListMultimap;\nimport com.google.common.collect.Multimap;\n\npublic class MultimapDemo {\n    public static void main(String[] args) {\n        Multimap<String,String> map = ArrayListMultimap.create();\n        map.put(\"\u540e\u7aef\",\"Java\");\n        map.put(\"\u540e\u7aef\",\"Go\");\n        map.put(\"\u524d\u7aef\",\"Vue\");\n        System.out.println(map.get(\"\u540e\u7aef\")); \/\/ [Java, Go]\n    }\n}\n<\/code><\/pre>\n\n\n\n
5. BiMap \u53cc\u5411\u6620\u5c04\uff1a\u952e\u503c\u4e92\u76f8\u67e5\u8be2<\/h3>\n\n\n\n
\u666e\u901a Map \u53ea\u80fd key \u67e5 value\uff0cBiMap \u53ef\u901a\u8fc7inverse()<\/code>\u53cd\u8f6c\u6620\u5c04\uff0c\u7528 value \u53cd\u5411\u67e5 key\u3002<\/p>\n\n\n\n
import com.google.common.collect.BiMap;\nimport com.google.common.collect.HashBiMap;\n\npublic class BiMapDemo {\n    public static void main(String[] args) {\n        BiMap<Integer,String> biMap = HashBiMap.create();\n        biMap.put(1,\"admin\");\n        \/\/ value\u53cd\u5411\u83b7\u53d6key\n        BiMap<String,Integer> inverseMap = biMap.inverse();\n        System.out.println(inverseMap.get(\"admin\")); \/\/1\n    }\n}\n<\/code><\/pre>\n\n\n\n
\u56db\u3001\u5b57\u7b26\u4e32\u5904\u7406\uff1aJoiner \u4e0e Splitter \u544a\u522b\u5197\u4f59\u4ee3\u7801<\/h2>\n\n\n\n
1. Joiner\uff1a\u5b57\u7b26\u4e32\u62fc\u63a5<\/h3>\n\n\n\n
\u539f\u751f\u5faa\u73af\u62fc\u63a5\u3001\u5904\u7406 null \u7a7a\u503c\u4ee3\u7801\u7e41\u6742\uff0cJoiner \u94fe\u5f0f\u914d\u7f6e\uff0c\u8f7b\u677e\u5904\u7406\u7a7a\u5143\u7d20\u3002<\/p>\n\n\n\n
import com.google.common.base.Joiner;\n\npublic class JoinerDemo {\n    public static void main(String[] args) {\n        String[] arr = {\"Java\",null,\"MySQL\",\"Linux\"};\n        \/\/ \u5ffd\u7565null\u5143\u7d20\u62fc\u63a5\n        String s1 = Joiner.on(\",\").skipNulls().join(arr);\n        System.out.println(s1); \/\/ Java,MySQL,Linux\n\n        \/\/ null\u66ff\u6362\u4e3a\u6307\u5b9a\u5b57\u7b26\n        String s2 = Joiner.on(\",\").useForNull(\"\u7a7a\").join(arr);\n        System.out.println(s2); \/\/ Java,\u7a7a,MySQL,Linux\n    }\n}\n<\/code><\/pre>\n\n\n\n
2. Splitter\uff1a\u7075\u6d3b\u5b57\u7b26\u4e32\u62c6\u5206<\/h3>\n\n\n\n
\u539f\u751f String.split \u5b58\u5728\u6b63\u5219\u5751\u70b9\uff0cSplitter \u62c6\u5206\u89c4\u5219\u53ef\u63a7\u3002<\/p>\n\n\n\n
import com.google.common.base.Splitter;\nimport java.util.List;\n\npublic class SplitterDemo {\n    public static void main(String[] args) {\n        String str = \"Java,,MySQL, Linux \";\n        \/\/ \u6309\u9017\u53f7\u62c6\u5206+\u5ffd\u7565\u7a7a\u4e32+\u53bb\u9664\u9996\u5c3e\u7a7a\u683c\n        List<String> list = Splitter.on(\",\")\n                .omitEmptyStrings()\n                .trimResults()\n                .splitToList(str);\n        System.out.println(list); \/\/ [Java, MySQL, Linux]\n    }\n}\n<\/code><\/pre>\n\n\n\n
\u4e94\u3001Guava \u672c\u5730\u7f13\u5b58 Cache<\/h2>\n\n\n\n
\u5f00\u53d1\u4e2d\u9ad8\u9891\u67e5\u8be2\u3001\u67e5\u8be2\u8017\u65f6\u9ad8\u7684\u6570\u636e\uff0c\u53ef\u4f7f\u7528 Guava Cache \u5b9e\u73b0\u8f7b\u91cf\u7ea7\u672c\u5730\u7f13\u5b58\uff0c\u65e0\u9700\u5f15\u5165 Redis \u7b49\u4e2d\u95f4\u4ef6\u3002<\/p>\n\n\n\n
import com.google.common.cache.Cache;\nimport com.google.common.cache.CacheBuilder;\nimport java.util.concurrent.TimeUnit;\n\npublic class CacheDemo {\n    public static void main(String[] args) throws Exception {\n        \/\/ \u6784\u5efa\u7f13\u5b58\uff1a\u6700\u5927\u5bb9\u91cf100\uff0c\u5199\u5165\u540e5\u5206\u949f\u8fc7\u671f\n        Cache<String,Integer> cache = CacheBuilder.newBuilder()\n                .maximumSize(100)\n                .expireAfterWrite(5, TimeUnit.MINUTES)\n                .build();\n\n        \/\/ \u5b58\u5165\u7f13\u5b58\n        cache.put(\"user:1001\",1001);\n        \/\/ \u83b7\u53d6\u7f13\u5b58\n        Integer userId = cache.getIfPresent(\"user:1001\");\n        System.out.println(userId);\n    }\n}\n<\/code><\/pre>\n\n\n\n
\u516d\u3001\u603b\u7ed3<\/h2>\n\n\n\n
Guava \u51e0\u4e4e\u8986\u76d6\u540e\u7aef\u65e5\u5e38\u5f00\u53d1\u7684\u5404\u7c7b\u5c0f\u5de5\u5177\u573a\u666f\uff0c\u5408\u7406\u5f15\u5165\u9879\u76ee\u53ef\u4ee5\u5927\u91cf\u7cbe\u7b80\u91cd\u590d\u4ee3\u7801\u3001\u51cf\u5c11\u7a7a\u6307\u9488\u3001\u4f18\u5316\u96c6\u5408\u4e0e\u5b57\u7b26\u4e32\u5904\u7406\u903b\u8f91\u3002\u540e\u7eed\u6211\u4f1a\u6301\u7eed\u66f4\u65b0 Guava \u9ad8\u7ea7\u7528\u6cd5\uff0c\u5305\u542b\u4e8b\u4ef6\u603b\u7ebf\u3001\u8303\u56f4\u5de5\u5177\u3001\u5f02\u6b65\u5de5\u5177\u7b49\u5185\u5bb9\uff0c\u611f\u5174\u8da3\u53ef\u4ee5\u6301\u7eed\u5173\u6ce8\u535a\u5ba2\u66f4\u65b0\u3002<\/p>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
\u65e5\u5e38 Java \u5f00\u53d1\u8fc7\u7a0b\u4e2d\uff0c\u539f\u751f JDK \u63d0\u4f9b\u7684\u5de5\u5177\u7c7b\u591a\u591a\u5c11\u5c11\u5b58\u5728\u77ed\u677f\uff1a\u7a7a\u6307\u9488\u6cdb\u6ee5\u3001\u96c6\u5408\u521b\u5efa\u7e41\u7410\u3001\u5b57\u7b26\u4e32\u62fc\u63a5\u62c6<\/p>\n
\n\t\t\t\t Read More <\/span> <\/i><\/a>\n\t\t\t<\/div>\n","protected":false},"author":1,"featured_media":1600,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20],"tags":[15],"class_list":["post-1597","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java","tag-java"],"_links":{"self":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/1597","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1597"}],"version-history":[{"count":3,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/1597\/revisions"}],"predecessor-version":[{"id":1601,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/1597\/revisions\/1601"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/media\/1600"}],"wp:attachment":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1597"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1597"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1597"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}