{"id":31136,"date":"2022-12-15T23:02:11","date_gmt":"2023-01-06T11:35:08","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java%e5%8e%9f%e5%88%9b%e9%97%ae%e9%a2%98%e5%88%9b%e5%bb%ba4%ef%bc%88java%e5%85%a5%e9%97%a8%e7%af%87%ef%bc%9a%e8%bd%bb%e6%9d%be%e7%90%86%e8%a7%a3java%ef%bc%89\/"},"modified":"2025-08-12T22:30:45","modified_gmt":"2025-08-12T14:30:45","slug":"java%e5%8e%9f%e5%88%9b%e9%97%ae%e9%a2%98%e5%88%9b%e5%bb%ba4%ef%bc%88java%e5%85%a5%e9%97%a8%e7%af%87%ef%bc%9a%e8%bd%bb%e6%9d%be%e7%90%86%e8%a7%a3java%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e5%8e%9f%e5%88%9b%e9%97%ae%e9%a2%98%e5%88%9b%e5%bb%ba4%ef%bc%88java%e5%85%a5%e9%97%a8%e7%af%87%ef%bc%9a%e8%bd%bb%e6%9d%be%e7%90%86%e8%a7%a3java%ef%bc%89\/","title":{"rendered":"Java\u539f\u521b\u95ee\u9898\u521b\u5efa4\uff08Java\u5165\u95e8\u7bc7\uff1a\u8f7b\u677e\u7406\u89e3Java\uff09"},"content":{"rendered":"

\u8fd9\u662fJava\u539f\u59cb\u95ee\u9898\u521b\u5efa3\u7684\u7eed\u7bc7\u3002<\/p>\n

\u7b2c14\u7ae0\uff08\u652f\u6301Java\u7684\u6807\u51c6\u7c7b\uff09\u95ee\u98981: \u8bf7\u4f7f\u7528JavaAPI\uff08Date\u7c7b\u3001Calendar\u7c7b\uff09\u6765\u663e\u793a\u5f53\u524d\u7684\u5e74\u4efd\u3001\u6708\u4efd\u548c\u65e5\u671f\u3002
\n\uff08\u793a\u4f8b\uff09\u663e\u793a\u793a\u4f8b\uff1a2020\u5e742\u670815\u65e5<\/p>\n

\u8bf7\u521b\u5efa\u4e00\u4e2a\u540d\u4e3asukki\u7684\u5305\u3002\uff08\u5c06\u4ee5\u4e0b\u6240\u6709\u7684\u7c7b\u653e\u5165\u8be5\u5305\u4e2d\uff09
\n\u521b\u5efaHero\u7c7b\u3002\u8bf7\u51c6\u5907\u4e00\u4e2a\u540d\u4e3aname\uff08String\u7c7b\u578b\uff09\u548c\u4e00\u4e2a\u540d\u4e3ahp\uff08int\u7c7b\u578b\uff09\u7684\u5b57\u6bb5\u3002
\n\u521b\u5efaMain\u7c7b\uff0c\u5e76\u7ed9Hero\u7c7b\u7684name\u548cage\u5b57\u6bb5\u8d4b\u503c\u3002\uff08name\u4e3a\u81ea\u5df1\u7684\u540d\u5b57\uff0cage\u4e3a100\uff09
\n\u8c03\u7528Hero\u7c7b\u7684\u5b9e\u4f8b\u3002
\n\u8bf7\u5c06\u663e\u793a\u7684\u201c\u7c7b\u578b\u540d@\u82f1\u6570\u5b57\u201d\u4fee\u6539\u4e3a\u81ea\u5df1\u7684\u540d\u5b57\u548c100\u3002<\/p>\n

\u63d0\u793a\uff08\u91cd\u5199toString\u65b9\u6cd5\uff09<\/p>\n

\u95ee\u98983
\n\u8bf7\u4f7f\u7528\u5c01\u88c5\u7c7b
\n\u5c06\u5b57\u7b26\u4e32\uff08\u53d8\u91cf\uff1a10\uff09\u8f6c\u6362\u4e3a\u6570\u5b57\u5e76\u663e\u793a\u51fa\u6765\u3002
\n\u53e6\u5916\uff0c\u8bf7\u5c06\u6570\u5b57\uff08\u53d8\u91cf\uff1a20\uff09\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u5e76\u663e\u793a\u51fa\u6765\u3002<\/p>\n

\u56de\u7b54<\/p>\n

\/\/\u554f\u984c\uff11<\/span>\r\npackage<\/span> date<\/span>;<\/span>\r\n\r\nimport<\/span> java.util.Calendar<\/span>;<\/span>\r\nimport<\/span> java.util.Date<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> Main2<\/span> {<\/span>\r\n        public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n                Date<\/span> now<\/span> =<\/span> new<\/span> Date<\/span>();<\/span>\r\n                Calendar<\/span> c<\/span> =<\/span> Calendar<\/span>.<\/span>getInstance<\/span>();<\/span>\r\n                c<\/span>.<\/span>setTime<\/span>(<\/span>now<\/span>);<\/span>\r\n                int<\/span> y<\/span> =<\/span> c<\/span>.<\/span>get<\/span>(<\/span>Calendar<\/span>.<\/span>YEAR<\/span>);<\/span>\r\n                int<\/span> m<\/span> =<\/span> c<\/span>.<\/span>get<\/span>(<\/span>Calendar<\/span>.<\/span>MONTH<\/span>)+<\/span>1<\/span>;<\/span>\r\n                int<\/span> d<\/span> =<\/span> c<\/span>.<\/span>get<\/span>(<\/span>Calendar<\/span>.<\/span>DAY_OF_MONTH<\/span>);<\/span>\r\n\r\n                System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>y<\/span> +<\/span> \"\u5e74\"<\/span> +<\/span> m<\/span> +<\/span> \"\u6708\"<\/span> +<\/span> d<\/span> +<\/span> \"\u65e5\"<\/span>);<\/span>\r\n        }<\/span>\r\n}<\/span>\r\n\r\n\r\n\r\n\/\/\u5b9f\u884c\u7d50\u679c<\/span>\r\n2021<\/span>\u5e744\u670822\u65e5<\/span>\r\n\r\n<\/code><\/pre>\n
\/\/\u554f\u984c\uff12<\/span>\r\npackage<\/span> sukki<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> Main<\/span> {<\/span>\r\n\r\n        public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n                \/\/ TODO \u81ea\u52d5\u751f\u6210\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u30fb\u30b9\u30bf\u30d6<\/span>\r\n                Hero<\/span> h<\/span> =<\/span> new<\/span> Hero<\/span>();<\/span>\r\n\r\n                h<\/span>.<\/span>name<\/span> =<\/span> \"\u30df\u30ca\u30c8\"<\/span>;<\/span>\r\n                h<\/span>.<\/span>hp<\/span> =<\/span> 100<\/span>;<\/span>\r\n                System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>h<\/span>.<\/span>toString<\/span>());<\/span>\r\n\r\n        }<\/span>\r\n}<\/span>\r\n\r\n\r\n\r\n\/\/\u5b9f\u884c\u7d50\u679c<\/span>\r\n\u30df\u30ca\u30c8<\/span>\r\n100<\/span>\r\n<\/code><\/pre>\n
package<\/span> sukki<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> Hero<\/span> {<\/span>\r\n        String<\/span> name<\/span>;<\/span>\r\n        int<\/span> hp<\/span>;<\/span>\r\n\r\n        public<\/span> String<\/span> toString<\/span>()<\/span> {<\/span>\r\n                return<\/span> this<\/span>.<\/span>name<\/span> +<\/span> this<\/span>.<\/span>hp<\/span>;<\/span>\r\n        }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\/\/\u554f\u984c\uff13<\/span>\r\npackage<\/span> rapper<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> Main<\/span> {<\/span>\r\n\r\n         public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span> args<\/span>[])<\/span> {<\/span>\r\n\r\n                \/\/ \u6587\u5b57\u5217\u3092\u6570\u5024\u306b\u5909\u63db<\/span>\r\n                String<\/span> s10<\/span> =<\/span> \"10\"<\/span>;<\/span>\r\n                Integer<\/span> num<\/span> =<\/span> Integer<\/span>.<\/span>parseInt<\/span>(<\/span>s10<\/span>);<\/span>\r\n                System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>num<\/span>);<\/span>\r\n\r\n                \/\/ \u6570\u5024\u3092\u6587\u5b57\u306b\u5909\u63db<\/span>\r\n                int<\/span> i<\/span>=<\/span>20<\/span>;<\/span>\r\n                String<\/span> str<\/span> =<\/span> String<\/span>.<\/span>valueOf<\/span>(<\/span>i<\/span>);<\/span> \/\/valueOf\u30e1\u30bd\u30c3\u30c9\u306fLong\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u306e1\u3064\u3067\u3059\u3002valueOf\u30e1\u30bd\u30c3\u30c9\u3092\u7528\u3044\u308b\u3053\u3068\u3067\u3001long\u578b\u306e\u5909\u6570\u304b\u5024\u3001\u3082\u3057\u304f\u306f\u3001String\u578b\u306e\u5909\u6570\u304b\u5024\u304b\u3089Long\u30af\u30e9\u30b9\u3092\u751f\u6210\u3059\u308b\u3053\u3068\u306e\u3067\u304d\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<\/span>\r\n                System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>str<\/span>);<\/span>\r\n            }<\/span>\r\n}<\/span>\r\n\r\n\r\n\r\n\/\/\u5b9f\u884c\u7d50\u679c<\/span>\r\n10<\/span>\r\n20<\/span>\r\n\r\n<\/code><\/pre>\n
\u7b2c15\u7ae0\uff08\u7279\u4f8b\uff09
\n\u25a0\u95ee\u98981
\n\u58f0\u660e\u4e00\u4e2a\u540d\u4e3as\u7684String\u578b\u53d8\u91cf\uff0c\u5e76\u5c06\u5176\u8d4b\u503c\u4e3anull\u3002
\n\u8bf7\u663e\u793as.length()\u7684\u5185\u5bb9\u3002<\/p>\n
\u8bf7\u4f7f\u7528try-catch\u8bed\u53e5\u6765\u5904\u7406\u5f02\u5e38\uff0c\u56e0\u4e3a\u51fa\u73b0\u4e86\u9519\u8bef\u3002
\ncatch\u90e8\u5206\u7684\u5185\u5bb9\uff1a\u8bf7\u663e\u793a\u5806\u6808\u8ddf\u8e2a\u3002<\/p>\n
\u95ee\u98982
\n\u8bf7\u521b\u5efa\u4e00\u4e2aexception\u5305\uff08\u5c06\u4ee5\u4e0b\u6240\u6709\u7684\u7c7b\u90fd\u653e\u5728\u8fd9\u91cc\uff09\u3002
\n\u521b\u5efaEx\u7c7b\uff0c\u5e76\u6dfb\u52a0\u4e00\u4e2aloop\u65b9\u6cd5\uff08\u629b\u51fa\u58f0\u660e[\u5f02\u5e38\u7c7b\uff1aArrayIndexOutOfBoundsException]\uff09\u3002
\nloop\u65b9\u6cd5\u7684\u5185\u5bb9\uff1a
\n– \u521b\u5efa\u4e00\u4e2a\u75313\u4e2a\u5143\u7d20[10,20,30]\u7ec4\u6210\u7684\u6570\u7ec4
\n– \u4f7f\u7528for\u5faa\u73af\u8c03\u75284\u4e2a\u5143\u7d20
\n\u521b\u5efaMain1\u7c7b\uff0c\u5e76\u8c03\u7528loop\u65b9\u6cd5\u3002
\n\u5728catch\u4e2d\u663e\u793a\u4ee5\u4e0b\u5185\u5bb9\uff1a\u201c\u53d1\u751f\u4e86\u5f02\u5e38\uff0c\u7a0b\u5e8f\u5c06\u63d0\u524d\u7ed3\u675f\u201d\u3002<\/p>\n
\u521b\u5efaPerson\u7c7b\uff0c\u5e76\u6dfb\u52a0set\u65b9\u6cd5\u3002
\nset\u65b9\u6cd5\u5185\u5bb9\uff1a
\n– \u5e26\u6709\u53c2\u6570(int\u578b)
\n– \u5982\u679c\u53c2\u6570\u5c0f\u4e8e0\uff0c\u5219\u629b\u51fa\u5f02\u5e38\u3002\uff08\u5f02\u5e38\u7c7b\uff1aIllegalArgumentException\uff09\uff08\u6d88\u606f\uff1a\u4e0d\u662f\u6b63\u6570\u3002\uff09
\n\u521b\u5efaMain3\u7c7b\uff0c\u8c03\u7528set\u65b9\u6cd5\u3002\uff08\u53c2\u6570\uff1a-2\uff09
\n\u5982\u679c\u53d1\u751f\u9519\u8bef\u5e76\u663e\u793a\u6d88\u606f\uff0c\u5219\u8bf4\u660e\u6b63\u786e\u3002<\/p>\n
\u56de\u7b54<\/p>\n
\/\/\u554f\u984c\uff11<\/span>\r\npackage<\/span> exception<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> Main<\/span> {<\/span>\r\n\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        \/\/ TODO \u81ea\u52d5\u751f\u6210\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u30fb\u30b9\u30bf\u30d6<\/span>\r\n\r\n        try<\/span> {<\/span>\r\n            String<\/span> s<\/span> =<\/span> null<\/span>;<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>s<\/span>.<\/span>length<\/span>());<\/span>\r\n\r\n        }<\/span>catch<\/span>(<\/span>NullPointerException<\/span> e<\/span>)<\/span> {<\/span>\r\n            e<\/span>.<\/span>printStackTrace<\/span>();<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\n\r\n\r\n\r\n\/\/\u5b9f\u884c\u7d50\u679c<\/span>\r\njava<\/span>.<\/span>lang<\/span>.<\/span>NullPointerException<\/span>\r\n    at<\/span> sa<\/span>\/<\/span>exception<\/span>.<\/span>Main<\/span>.<\/span>main<\/span>(<\/span>Main<\/span>.<\/span>java<\/span>:<\/span>10<\/span>)<\/span>\r\n\r\n<\/code><\/pre>\n
\/\/\u554f\u984c\uff12<\/span>\r\npackage<\/span> exception<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> Main1<\/span> {<\/span>\r\n\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        try<\/span> {<\/span>\r\n            Ex<\/span> ex<\/span> =<\/span> new<\/span> Ex<\/span>();<\/span>\r\n            ex<\/span>.<\/span>loop<\/span>();<\/span>\r\n        }<\/span> catch<\/span> (<\/span>ArrayIndexOutOfBoundsException<\/span> e<\/span>)<\/span> {<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u4f8b\u5916\u767a\u751f\u3057\u307e\u3057\u305f\u9014\u4e2d\u3067\u7d42\u4e86\u3057\u307e\u3059\"<\/span>);<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\n\r\n\r\n\/\/\u5b9f\u884c\u7d50\u679c<\/span>\r\n10<\/span>\r\n20<\/span>\r\n30<\/span>\r\n\u4f8b\u5916\u767a\u751f\u3057\u307e\u3057\u305f\u9014\u4e2d\u3067\u7d42\u4e86\u3057\u307e\u3059<\/span>\r\n\r\n<\/code><\/pre>\n
package<\/span> exception<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> Ex<\/span> {<\/span>\r\n\r\n    public<\/span> void<\/span> loop<\/span>()<\/span> throws<\/span> ArrayIndexOutOfBoundsException<\/span>{<\/span>\r\n        \/\/ArrayIndexOutOfBoundsException\u30fb\u30fb\u4e0d\u6b63\u306a\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u4f7f\u3063\u3066\u914d\u5217\u304c\u30a2\u30af\u30bb\u30b9\u3055\u308c\u305f\u3053\u3068\u3092\u793a\u3059\u305f\u3081\u306b\u30b9\u30ed\u30fc\u3055\u308c\u307e<\/span>\r\n\r\n    \/\/\u307b\u3093\u3068\u306f\u3053\u3053\u3067\u30a8\u30e9\u30fc\u304c\u8d77\u304d\u3066\u308b\u304bthrows\u3092\u3064\u3051\u308b\u3053\u3068\u3067\u3001\u30a8\u30e9\u30fc\u51fa\u305f\u5834\u5408\u306f\u3088\u308d\u3057\u304f<\/span>\r\n        int<\/span>[]<\/span> num<\/span> =<\/span> {<\/span>10<\/span>,<\/span>20<\/span>,<\/span>30<\/span>};<\/span>\r\n        for<\/span>(<\/span>int<\/span> i<\/span>=<\/span>0<\/span>;<\/span> i<\/span><<\/span>4<\/span>;<\/span> i<\/span>++)<\/span> {<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>num<\/span>[<\/span>i<\/span>]);<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\n<\/code><\/pre>\n
\/\/\u554f\u984c\uff13<\/span>\r\npackage<\/span> exception<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> Main3<\/span> {<\/span>\r\n\r\n        public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n                Person<\/span> p<\/span> =<\/span> new<\/span> Person<\/span>();<\/span>\r\n                p<\/span>.<\/span>set<\/span>(-<\/span>2<\/span>);<\/span>\r\n        }<\/span>\r\n}<\/span>\r\n\r\n\r\n\r\n\/\/\u5b9f\u884c\u7d50\u679c<\/span>\r\nException<\/span> in<\/span> thread<\/span> \"main\"<\/span> java<\/span>.<\/span>lang<\/span>.<\/span>IllegalArgumentException<\/span>:<\/span> \u6b63\u306e\u6570\u3067\u306f\u3042\u308a\u307e\u305b\u3093<\/span>\u3002<\/span>\r\n    at<\/span> sa<\/span>\/<\/span>exception<\/span>.<\/span>Person<\/span>.<\/span>set<\/span>(<\/span>Person<\/span>.<\/span>java<\/span>:<\/span>7<\/span>)<\/span>\r\n    at<\/span> sa<\/span>\/<\/span>exception<\/span>.<\/span>Main3<\/span>.<\/span>main<\/span>(<\/span>Main3<\/span>.<\/span>java<\/span>:<\/span>7<\/span>)<\/span>\r\n\r\n<\/code><\/pre>\n
package<\/span> exception<\/span>;<\/span>\r\n\r\npublic<\/span> final<\/span> class<\/span> Person<\/span> {<\/span>\r\n\r\n    public<\/span> void<\/span> set<\/span>(<\/span>int<\/span> age<\/span>)<\/span> {<\/span>\r\n        if<\/span> (<\/span>age<\/span> <<\/span> 0<\/span>)<\/span> {<\/span>\r\n            throw<\/span> new<\/span> IllegalArgumentException<\/span>(<\/span>\"\u6b63\u306e\u6570\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\"<\/span>);<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
Java\u539f\u521b\u95ee\u9898\u521b\u5efa1\uff08Java\u5165\u95e8\u7bc7\uff1a\u6613\u61c2\u7684Java\uff09<\/p>\n
Java\u539f\u59cb\u95ee\u9898\u521b\u5efa2\uff08Java\u5165\u95e8\u7bc7\uff1a\u5bb9\u6613\u7406\u89e3\u7684Java\uff09<\/p>\n
Java\u539f\u59cb\u95ee\u9898\u521b\u5efa3\uff08Java\u5165\u95e8\u7bc7\uff1a\u8f7b\u677e\u7406\u89e3Java\uff09<\/p>\n
\u7ed3\u675f\u4e86\u3002<\/p>\n
\u8f9b\u82e6\u4e86\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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