{"id":31046,"date":"2023-07-21T09:53:44","date_gmt":"2024-01-27T07:30:17","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java-%e6%a6%82%e8%bf%b0-2\/"},"modified":"2025-08-12T22:02:32","modified_gmt":"2025-08-12T14:02:32","slug":"java-%e6%a6%82%e8%bf%b0-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java-%e6%a6%82%e8%bf%b0-2\/","title":{"rendered":"Java \u6982\u8ff0"},"content":{"rendered":"

\u5b57\u7b26 String \u6574\u6570 \u6d6e\u70b9\u6570 \u5e03\u5c14<\/p>\n

\u5b57\u7b26<\/p>\n

char\u578b\u53ef\u4ee5\u4ee3\u8868\u4e00\u4e2a\u5b57\u7b26\u3002<\/p>\n

\u53ef\u4ee5\u8f93\u51faUnicode\u5b57\u7b26\u7f16\u53f7\u3002<\/p>\n

\u7528\u300c\u2018\u2019\u300d\u62ec\u8d77\u6765<\/p>\n
char<\/span> a<\/span>=<\/span>'\u3042'<\/span>;<\/span>\r\nchar<\/span> a<\/span>=<\/span> 0x3042<\/span>;<\/span>\r\n\r\nchar<\/span> a<\/span>=<\/span> 0x3043<\/span>;<\/span> \/\/a=\u3043\u3000<\/span>\r\n<\/code><\/pre>\n
\u628a\u4e0b\u9762\u7684\u53e5\u5b50\u7528\u6c49\u8bed\u81ea\u7136\u5730\u6539\u5199\u4e00\u4e0b\uff0c\u53ea\u9700\u8981\u4e00\u4e2a\u9009\u9879\uff1a\u5b57\u7b26\u4e32<\/p>\n
String<\/span> a<\/span> =<\/span>\"\u3042\"<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u8bf7\u63d0\u4f9b\u4e00\u4e2a\u8865\u5145\u7684\u4e0a\u4e0b\u6587\u6765\u66f4\u597d\u5730\u786e\u4fdd\u51c6\u786e\u7ffb\u8bd1\u3002<\/p>\n
int<\/span> a<\/span>=<\/span>1<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u53cc\u500d<\/p>\n
double<\/span> b<\/span>=<\/span>0.3<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u5e03\u5c14 (b\u00f9’\u011br)\u6b63\u786e\u8fd8\u662f\u9519\u8bef\uff1f<\/p>\n
\/\/\u521d\u671f\u5024\u3092\u6c7a\u3081\u308b\u5834\u4f1a<\/span>\r\nboolean<\/span> data<\/span> =<\/span> true<\/span>;<\/span>\r\n\r\nboolean<\/span> data<\/span> =<\/span> false<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u5982\u679c\u5728if\u8bed\u53e5\u4e2d\u505a\u6761\u4ef6\u5206\u652f\u5224\u65ad
\n\u8fdb\u884c\u6570\u5b57\u6216\u5b57\u7b26\u4e32\u7684\u6bd4\u8f83
\n– \u6570\u5b57\u6bd4\u8f83\u4f7f\u7528\u7b49\u53f7\u7b49\u4e8e<\/p>\n
int<\/span> a<\/span> =<\/span>0<\/span>;<\/span>\r\nint<\/span> b<\/span> =<\/span>0<\/span>;<\/span>\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>a<\/span>==<\/span>b<\/span>);<\/span> \/\/ true<\/span>\r\n<\/code><\/pre>\n
\u6587\u5b57\u5217 – li\u00e8<\/p>\n
String<\/span> msg1<\/span> =<\/span> \"Hello\"<\/span>;<\/span>\r\nString<\/span> msg2<\/span> =<\/span> new<\/span> String<\/span>(<\/span>msg1<\/span>);<\/span>\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>msg1<\/span>.<\/span>equals<\/span>(<\/span>msg2<\/span>));<\/span> \/\/ true<\/span>\r\n<\/code><\/pre>\n
\u4f7f\u7528for\u5faa\u73af\u8bed\u53e5\u6216while\u5faa\u73af\u8bed\u53e5\u6765\u51b3\u5b9a\u662f\u5426\u7ee7\u7eed\u5faa\u73af\u3002<\/p>\n
\u53d8\u91cf\u8d4b\u503c<\/p>\n
\u53d8\u91cf\u548c\u6570\u503c\u7684\u8ba1\u7b97<\/p>\n
int<\/span> a<\/span> =<\/span>5<\/span>;<\/span>\r\nint<\/span> b<\/span> =<\/span>a<\/span>;<\/span>\/\/5<\/span>\r\nString<\/span> c<\/span> =<\/span>\"oppai\"<\/span>;<\/span>\r\nString<\/span> d<\/span> =<\/span>c<\/span>;<\/span>\/\/oppai<\/span>\r\n<\/code><\/pre>\n
\u5982\u679c+ (\u6761\u4ef6\/\u60c5\u51b5\/\u4e8b\u4ef6)\uff0c\u5c31+ (\u7ed3\u679c\/\u884c\u52a8)<\/p>\n
if<\/span> (<\/span>a<\/span>==<\/span>0<\/span>){<\/span>\r\n    System<\/span>.<\/span>out<\/span>.<\/span>print<\/span>(<\/span>\"a:\"<\/span>a<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u53e6\u5916\u7684\u6587\u672c<\/p>\n
int<\/span> a<\/span> =(<\/span>int<\/span>)(<\/span>Math<\/span>.<\/span>random<\/span>()*<\/span>2<\/span>);<\/span>\r\n\/\/int a =(int)(Math.random()*2+1);<\/span>\r\nif<\/span> (<\/span>a<\/span>==<\/span>0<\/span>){<\/span>\r\n    System<\/span>.<\/span>out<\/span>.<\/span>print<\/span>(<\/span>\"a:0\"<\/span>);<\/span>\r\n}<\/span>else<\/span> if<\/span>(<\/span>a<\/span>==<\/span>1<\/span>){<\/span>\r\n    System<\/span>.<\/span>out<\/span>.<\/span>print<\/span>(<\/span>\"a:1\"<\/span>);<\/span>\r\n}<\/span>else<\/span>{<\/span>\r\n    System<\/span>.<\/span>out<\/span>.<\/span>print<\/span>(<\/span>\"a:2\"<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u7528\u4e8e\u5faa\u73af\u63a7\u5236\u7684\u5173\u952e\u5b57<\/p>\n
for<\/span>(<\/span>int<\/span> i<\/span>=<\/span>0<\/span>;<\/span>i<\/span><<\/span>5<\/span>;<\/span>i<\/span>++){<\/span>\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>i<\/span>);<\/span>\r\n}<\/span>   \/\/0,1,2,3,4<\/span>\r\nfor<\/span>(<\/span>int<\/span> i<\/span>=<\/span>5<\/span>;<\/span>i<\/span>><\/span>0<\/span>;<\/span>i<\/span>--){<\/span>\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>i<\/span>);<\/span>\r\n}<\/span>    \/\/5,4,3,2,1<\/span>\r\n<\/code><\/pre>\n
SWITCH\u6587<\/p>\n
int<\/span> num<\/span> =<\/span> (<\/span>int<\/span>)(<\/span>Math<\/span>.<\/span>random<\/span>()*<\/span>5<\/span>+<\/span>1<\/span>);<\/span> \/\/1~5\u306e\u30e9\u30f3\u30c0\u30e0<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>num<\/span>);<\/span> \r\n    \r\n            switch<\/span>(<\/span>num<\/span>){<\/span>\r\n            case<\/span> 1<\/span>:<\/span>\r\n                System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"1\u7b49\u8cde\"<\/span>);<\/span>\r\n                break<\/span>;<\/span>\r\n            case<\/span> 2<\/span>:<\/span>\r\n                System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"2\u7b49\u8cde\"<\/span>);<\/span>\r\n                break<\/span>;<\/span>\r\n            case<\/span> 3<\/span>:<\/span>\r\n                System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"3\u7b49\u8cde\"<\/span>);<\/span>\r\n                break<\/span>;<\/span>\r\n            case<\/span> 4<\/span>:<\/span>\r\n                System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"4\u7b49\u8cde\"<\/span>);<\/span>\r\n                break<\/span>;<\/span>\r\n            default<\/span>:<\/span>        \/\/1~4\u4ee5\u5916\u306e\u6570\u5b57\u306e\u6642\u306b\u5b9f\u884c<\/span>\r\n                System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u6b8b\u5ff5\u8cde\"<\/span>);<\/span>\r\n            }<\/span>  \r\n<\/code><\/pre>\n
“\u6267\u884c\u5faa\u73af\u4f53\u8bed\u53e5\uff0c\u76f4\u5230\u6761\u4ef6\u4e0d\u6ee1\u8db3”<\/p>\n
\u6253\u7834\u5b8c\u6210\u5904\u7406<\/p>\n
int<\/span> i<\/span> =<\/span>0<\/span>;<\/span>\r\nwhile<\/span>(<\/span>true<\/span>){<\/span>\r\n    i<\/span>++;<\/span>\r\n    if<\/span>(<\/span>i<\/span>>=<\/span>5<\/span>){<\/span>\r\n        break<\/span>;<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u7ee7\u7eed\u8df3\u8fc7 continue\u8bed\u53e5\u6267\u884c\u540e\u7684\u4ee3\u7801\u5904\u7406<\/p>\n
for<\/span>(<\/span>int<\/span> i<\/span>=<\/span>0<\/span>;<\/span>i<\/span><<\/span>10<\/span>;<\/span>i<\/span>++){<\/span>\r\n    if<\/span>(<\/span>i<\/span>%<\/span>2<\/span>==<\/span>0<\/span>){<\/span>\r\n        continue<\/span>;<\/span> \/\/\u30b3\u30b3\u306e\u51e6\u7406\u4ee5\u964d\u30b9\u30ad\u30c3\u30d7\u3055\u308c\u307e\u305ffor\u6587\u304c\u7d9a\u304f<\/span>\r\n    }<\/span>\r\n    System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>i<\/span>);<\/span>  \/\/\u5947\u6570\u304c\u51fa\u529b\u3055\u308c\u308b1,3,5,7,9<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u54c8\u5e0c\u6620\u5c04
\n\u5bfc\u5165java.util.HashMap;<\/p>\n
HashMap<\/span><<\/span>Integer<\/span>,<\/span>String<\/span>><\/span> num<\/span> =<\/span> new<\/span> HashMap<\/span><>();<\/span>\r\n\r\nnum<\/span>.<\/span>put<\/span>(<\/span>1<\/span>,<\/span>\"0001\"<\/span>);<\/span>\/\/\u5165\u529b<\/span>\r\nnum<\/span>.<\/span>put<\/span>(<\/span>2<\/span>,<\/span>\"0010\"<\/span>);<\/span>\r\nnum<\/span>.<\/span>put<\/span>(<\/span>3<\/span>,<\/span>\"0011\"<\/span>);<\/span>\r\n\r\nnum<\/span>.<\/span>get<\/span>(<\/span>1<\/span>);<\/span> \/\/0001\u304c\u51fa\u529b<\/span>\r\n\/\/\u6587\u5b57\u304b\u3089\u6570\u5b57<\/span>\r\nint<\/span> num01<\/span> =<\/span> Integer<\/span>.<\/span>parseInt<\/span>(<\/span>num<\/span>.<\/span>get<\/span>(<\/span>1<\/span>));<\/span>\r\n\r\n<\/code><\/pre>\n
\u54c8\u5e0c\u6620\u5c04\u5bfc\u5165java.util.HashMap;<\/p>\n
HashMap<\/span><<\/span>String<\/span>,<\/span>String<\/span>><\/span> moji<\/span> =<\/span> new<\/span> HashMap<\/span><>();<\/span>\r\nnum<\/span>.<\/span>put<\/span>(<\/span>\"A\"<\/span>,<\/span>\"a\"<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u586b\u88650%04d \u8868\u793a\u4e00\u4e2a\u683c\u5f0f\u5b57\u7b26\u4e32\u7684\u6307\u4ee4\u7b26
\n0 \u7528\u6765\u586b\u5145\u7684\u5b57\u7b26\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u662f0
\n4 \u6570\u5b57\u7684\u4f4d\u6570\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u662f5\u4f4d
\nd \u8868\u793a\u8981\u8f93\u51fa\u7684\u503c\u7684\u7c7b\u578b\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u662f\u6574\u6570<\/p>\n
System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>String<\/span>.<\/span>format<\/span>(<\/span>\"%04d\"<\/span>,<\/span> 1<\/span>));<\/span>\/\/0001\u304c\u51fa\u529b<\/span>\r\n<\/code><\/pre>\n
\u6574\u578b\u6570\u7ec4[]<\/p>\n
int<\/span> []<\/span>hairetu<\/span> =<\/span>new<\/span> int<\/span> [<\/span>3<\/span>];<\/span>\r\n    hairetu<\/span>[<\/span>0<\/span>]=<\/span>0<\/span>;<\/span>\r\n    hairetu<\/span>[<\/span>1<\/span>]=<\/span>1<\/span>;<\/span>\r\n    hairetu<\/span>[<\/span>2<\/span>]=<\/span>2<\/span>;<\/span>\r\n\r\n    System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>hairetu<\/span>[<\/span>0<\/span>]);<\/span> \/\/0\u51fa\u529b<\/span>\r\n<\/code><\/pre>\n
\u5b57\u7b26\u4e32\u6570\u7ec4<\/p>\n
String<\/span> []<\/span> moji01<\/span> =<\/span> new<\/span> String<\/span> [<\/span>3<\/span>];<\/span>\r\n                moji01<\/span>[<\/span>0<\/span>]=<\/span>\"a\"<\/span>;<\/span>\r\n                moji01<\/span>[<\/span>1<\/span>]=<\/span>\"b\"<\/span>;<\/span>\r\n                moji01<\/span>[<\/span>2<\/span>]=<\/span>\"c\"<\/span>;<\/span>\r\n\r\n                System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>moji01<\/span>[<\/span>0<\/span>]);<\/span>\r\n                System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>moji01<\/span>[<\/span>hairetu<\/span>[<\/span>0<\/span>]]);<\/span>\r\n<\/code><\/pre>\n
\u4e8c\u7ef4\u6570\u7ec4<\/p>\n
\u96f6\u96f6 \u96f6\u4e00 \u96f6\u4e8c<\/p>\n
1-0 1-1 1-2\u4e00\u6bd4\u96f6 \u4e00\u6bd4\u4e00 \u4e00\u6bd4\u4e8c<\/p>\n
2-0 2-1 2-2:\u4e8c\u6bd4\u96f6 \u4e8c\u6bd4\u4e00 \u4e8c\u6bd4\u4e8c<\/p>\n
 int<\/span> [][]<\/span> nijigenn<\/span> =<\/span>new<\/span> int<\/span> [<\/span>3<\/span>][<\/span>3<\/span>];<\/span>\r\n    nijigenn<\/span>[<\/span>0<\/span>][<\/span>0<\/span>]=<\/span>1<\/span>;<\/span>\r\n    nijigenn<\/span>[<\/span>1<\/span>][<\/span>0<\/span>]=<\/span>2<\/span>;<\/span>\r\n    \r\n    System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>nijigenn<\/span>[<\/span>1<\/span>][<\/span>0<\/span>]);<\/span>\/\/ 2\u304c\u51fa\u529b<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u5b57\u7b26 String \u6574\u6570 \u6d6e\u70b9\u6570 \u5e03\u5c14 \u5b57\u7b26 char\u578b\u53ef\u4ee5\u4ee3\u8868\u4e00\u4e2a\u5b57\u7b26\u3002 \u53ef\u4ee5\u8f93\u51faUnicode\u5b57\u7b26\u7f16\u53f7\u3002  […]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-31046","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"\nJava \u6982\u8ff0 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u5173\u4e8eJava \u6982\u8ff0\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/java-\u6982\u8ff0-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java \u6982\u8ff0\" \/>\n<meta property=\"og:description\" content=\"\u5173\u4e8eJava \u6982\u8ff0\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/java-\u6982\u8ff0-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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