{"id":31070,"date":"2023-08-14T07:17:44","date_gmt":"2022-11-26T05:38:34","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8ejava%e7%9a%84%e5%ad%97%e7%ac%a6%e4%b8%b2\/"},"modified":"2025-08-12T22:10:30","modified_gmt":"2025-08-12T14:10:30","slug":"%e5%85%b3%e4%ba%8ejava%e7%9a%84%e5%ad%97%e7%ac%a6%e4%b8%b2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8ejava%e7%9a%84%e5%ad%97%e7%ac%a6%e4%b8%b2\/","title":{"rendered":"\u5173\u4e8eJava\u7684\u5b57\u7b26\u4e32"},"content":{"rendered":"

“String\u662f\u4ec0\u4e48\uff1f”\u9996\u5148\uff0cstring\u7684\u672c\u8d28\u662fchar\u6570\u7ec4\uff0c\u4f8b\u5982<\/p>\n
String<\/span> a<\/span> =<\/span> \"hello\"<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u5176\u5b9e\u4ee5\u4e0b\u4ee3\u7801\u662f\u4e00\u6837\u7684<\/p>\n
char<\/span>[]<\/span> b<\/span> =<\/span> {<\/span>'h'<\/span>,<\/span>'e'<\/span>,<\/span>'l'<\/span>,<\/span>'l'<\/span>,<\/span>'o'<\/span>};<\/span>\r\n<\/code><\/pre>\n
\u5c06\u5b57\u7b26\u4e32\u4e0e\u5176\u4ed6\u7c7b\u578b\u8f6c\u6362\u8fd9\u91cc\u4ee5int\u4f5c\u4e3a\u4f8b\u5b50\uff0c\u8bed\u6cd5\u5982\u4e0b\u3002<\/p>\n
\/\/int toString: string.valueof(int)<\/span>\r\n     String<\/span> abc<\/span> =<\/span> String<\/span>.<\/span>valueOf<\/span>(<\/span>200<\/span>);<\/span>\r\n\r\n \/\/String to int:     integer.parseint(string)<\/span>\r\n     int<\/span> bcd<\/span> =<\/span> Integer<\/span>.<\/span>parseInt<\/span>(<\/span>\"200\"<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u65e5\u671f\u5b57\u7b26\u4e32\u5de5\u5177\u8fd9\u4e2a\u548cScanner\u4e00\u6837\uff0c\u5f15\u7528\u4e86Java.util.Date\u7684\u5185\u5bb9\u3002<\/p>\n
    java<\/span>.<\/span>util<\/span>.<\/span>Date<\/span> now<\/span> =<\/span> new<\/span> java<\/span>.<\/span>util<\/span>.<\/span>Date<\/span>();<\/span>\r\n    \/\/\u30d5\u30a9\u30de\u30fc\u30c9\u5236\u5b9a\u3057\u305f\u3044\u306a\u3089\uff1a<\/span>\r\n    SimpleDateFormat<\/span> sdf<\/span> =<\/span> new<\/span> SimpleDateFormat<\/span>(<\/span>\"yyyy\u5e74mm\u6708dd\u65e5hh\u70b9mm\u5206ss\u79d2\"<\/span>);<\/span>\r\n    String<\/span> date<\/span> =<\/span> sdf<\/span>.<\/span>format<\/span>(<\/span>now<\/span>);<\/span>\r\n    System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>date<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u5982\u679c\u60f3\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u65e5\u671f\uff1a<\/p>\n
     String<\/span> date1<\/span> =<\/span>\"2022\u5e741\u67081\u65e513\u65f610\u520650\u79d2\"<\/span>;<\/span>\r\n     SimpleDateFormat<\/span> qwe<\/span> =<\/span> new<\/span> SimpleDateFormat<\/span>(<\/span>\"yyyy\u5e74mm\u6708dd\u65e5hh\u70b9mm\u5206ss\u79d2\"<\/span>);<\/span>\r\n     java<\/span>.<\/span>util<\/span>.<\/span>Date<\/span> datea<\/span> =<\/span> qwe<\/span>.<\/span>parse<\/span>(<\/span>date1<\/span>);<\/span> \/\/can get the type of date form string<\/span>\r\n     System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>datea<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u5b57\u7b26\u4e32n\u7684\u6bd4\u8f83<\/p>\n
     String<\/span> a<\/span> =<\/span>\"abc\"<\/span>;<\/span>\r\n     String<\/span> b<\/span> =<\/span>\"bcd\"<\/span>;<\/span>\r\n     a<\/span>.<\/span>equals<\/span>(<\/span>b<\/span>);<\/span> \/\/a\u3068\uff42\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u306f\u540c\u3058\u306a\u3089true \u9055\u3046\u306a\u3089false <\/span>\r\n     a<\/span>.<\/span>equalsIgnoreCase<\/span>(<\/span>b<\/span>);<\/span>\/\/\u30a2\u30eb\u30d5\u30a1\u30d9\u30c3\u30c8\u306e\u5927\u6587\u5b57\u3068\u5c0f\u6587\u5b57\u3092\u7121\u8996\u3059\u308b<\/span>\r\n     a<\/span>.<\/span>compareTo<\/span>(<\/span>b<\/span>);<\/span>\/\/ a\u3068b\u6bd4\u8f03\u3059\u308b<\/span>\r\n     a<\/span>.<\/span>isEmpty<\/span>();<\/span>\/\/string\u306f\u30b9\u30da\u30fc\u30b9\u3067\u3059\u304b\u3000\u30b9\u30da\u30fc\u30b9\u306a\u3089true \u9055\u3046\u306a\u3089false <\/span>\r\n     a<\/span>.<\/span>contains<\/span>(<\/span>b<\/span>);<\/span>\/\/a\u306bb\u304c\u3042\u308b\u304b\u3069\u3046\u304b \u3042\u308b\u306a\u3089true \u9055\u3046\u306a\u3089false<\/span>\r\n     a<\/span>.<\/span>startsWith<\/span>(<\/span>a<\/span>);<\/span>\/\/string a\u3067\u59cb\u307e\u308b\u304b\u3069\u3046\u304b \u540c\u3058\u306a\u3089true \u9055\u3046\u306a\u3089false<\/span>\r\n     a<\/span>.<\/span>endsWith<\/span>(<\/span>b<\/span>);<\/span>\/\/a \u306fb\u3067\u59cb\u307e\u308b\u304b\u3069\u3046\u304b \u540c\u3058\u306a\u3089true \u9055\u3046\u306a\u3089false<\/span>\r\n<\/code><\/pre>\n
\u5176\u4ed6\u7684\u5de5\u5177string<\/p>\n
    \/\/\u30b9\u30da\u30fc\u30b9\u3092\u524a\u9664<\/span>\r\n     String<\/span> aad<\/span> =<\/span> new<\/span> String<\/span>(<\/span>\"i love u\"<\/span>);<\/span>\r\n     System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>aad<\/span>.<\/span>trim<\/span>());<\/span>\r\n\r\n    \/\/\u5927\u6587\u5b57\u306b\u306a\u308b<\/span>\r\n     aad<\/span>.<\/span>toUpperCase<\/span>();<\/span> \r\n\r\n     \/\/\u5c0f\u6587\u5b57\u306b\u306a\u308b<\/span>\r\n     aad<\/span>.<\/span>toLowerCase<\/span>();<\/span>  \r\n\r\n     \/\/starindex endindex\u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u53d6\u308a\u5207\u308a<\/span>\r\n     aad<\/span>.<\/span>substring<\/span>(<\/span>1<\/span>,<\/span>2<\/span>);<\/span>\r\n\r\n     \/\/\u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u5909\u5316<\/span>\r\n     aad<\/span>.<\/span>replace<\/span>(<\/span>\"i\"<\/span>,<\/span> \"I\"<\/span>);<\/span>\r\n\r\n     \/\/split() \u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u5206\u5272\u3000\u4f8b\u3048\u3070\uff1a<\/span>\r\n     String<\/span> asf<\/span> =<\/span>\"i love you\"<\/span>;<\/span>\r\n     String<\/span>[]<\/span> splited<\/span> =<\/span> asf<\/span>.<\/span>split<\/span>(<\/span>\"\"<\/span>);<\/span>\/\/get [\"i\",\"love\",\"you\"]<\/span>\r\n<\/code><\/pre>\n
\u6700\u540e\u5173\u4e8eStringBuffer\u7684\u95ee\u9898
\nstring\u662f\u4e00\u4e2a\u4e0d\u53ef\u53d8\u7684\u91cf\uff0c\u6240\u4ee5\u5b83\u7684\u5185\u5bb9\u4e0d\u4f1a\u6539\u53d8\uff0c\u5b83\u4f1a\u751f\u6210\u4e00\u4e2a\u65b0\u7684\u503c\u3002
\n\u4f8b\u5982\uff1a<\/p>\n
String<\/span> a<\/span> =<\/span> \"i love u\"<\/span>\r\nString<\/span> b<\/span> =<\/span> a<\/span>.<\/span>trim<\/span>();<\/span>\/\/\u305d\u3053a\u306e\u5024\u306f\u5909\u5316\u3057\u307e\u305b\u3093\u3000\u65b0\u305f\u306a\u5024\u3092\u751f\u6210\u3067\u3057\u305f\u3002<\/span>\r\n<\/code><\/pre>\n
\u5f53\u751f\u6210\u5927\u91cf\u6570\u636e\u65f6\uff0c\u5c31\u4f1a\u51fa\u73b0\u5361\u987f\u548c\u6027\u80fd\u4e0b\u964d\u7684\u95ee\u9898\uff0c\u6240\u4ee5\u8981\u4f7f\u7528StringBuffer\u3002<\/p>\n
\/\/\u6642\u9593\u3092\u8a18\u9332\uff1a<\/span>\r\nlong<\/span> begin<\/span> =<\/span> System<\/span>.<\/span>currentTimeMillis<\/span>();<\/span>\/\/1970\u5e741\u67081\u65e5\u304b\u3089\u73fe\u5728\u307e\u3067<\/span>\r\nlong<\/span> end<\/span> =<\/span>System<\/span>.<\/span>currentTimeMillis<\/span>();<\/span>\r\nlong<\/span> spendtime<\/span> =<\/span> end<\/span> -<\/span> begin<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u5173\u4e8eStringBuffer\u7684\u5de5\u5177\uff1a
\n\u6dfb\u52a0\u5185\u5bb9
\n\u5220\u9664\u5185\u5bb9
\n\u66ff\u6362\u5185\u5bb9
\n\u53cd\u8f6c\u5185\u5bb9
\n\u8f6c\u6362\u4e3aString\u7c7b\u578b<\/p>\n
    StringBuffer<\/span> sb<\/span>=<\/span>new<\/span> StringBuffer<\/span>();<\/span>\r\n    sb<\/span>.<\/span>append<\/span>(<\/span>\"hello\"<\/span>).<\/span>append<\/span>(<\/span>\"world\"<\/span>).<\/span>append<\/span>(<\/span>\"java\"<\/span>);<\/span>\r\n    System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>sb<\/span>);<\/span>\r\n    sb<\/span>.<\/span>delete<\/span>(<\/span>0<\/span>,<\/span> 5<\/span>);<\/span>\r\n    System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>sb<\/span>);<\/span>\r\n    sb<\/span>.<\/span>replace<\/span>(<\/span> 0<\/span>,<\/span> 5<\/span>,<\/span> \"lalala\"<\/span>);<\/span>\r\n    System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>sb<\/span>);<\/span>\r\n    sb<\/span>.<\/span>reverse<\/span>();<\/span>\r\n    System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>sb<\/span>);<\/span>\r\n    sb<\/span>.<\/span>toString<\/span>();<\/span>\r\n<\/code><\/pre>\n
\u8fd9\u662f\u4ee5\u4e0a\u4e86\uff0c\u975e\u5e38\u611f\u8c22\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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