{"id":80,"date":"2021-08-25T16:07:05","date_gmt":"2021-08-25T08:07:05","guid":{"rendered":"https:\/\/www.52dixiaowo.com\/javav2\/?p=80"},"modified":"2021-08-25T16:07:05","modified_gmt":"2021-08-25T08:07:05","slug":"java-lang-string","status":"publish","type":"post","link":"https:\/\/www.52dixiaowo.com\/javav2\/post-80.html","title":{"rendered":"java.lang.String"},"content":{"rendered":"\n

String \u7c7b\u662f\u57fa\u672c\u6570\u636e\u7c7b\u578b\u4e4b\u4e00\uff0c\u5b98\u65b9\u6587\u6863\u4f20\u9001\u95e8\uff1ajava.lang.String<\/a><\/p>\n\n\n\n

String \u662f\u4e00\u79cd\u5e38\u91cf\uff0c\u6548\u679c\u4e0a\u76f8\u5f53\u4e8e\u5b57\u7b26\u6570\u7ec4\uff0c\u5e95\u5c42\u539f\u7406\u662f\u5b57\u8282\u6570\u7ec4<\/p>\n\n\n\n

\u6784\u9020\u65b9\u6cd5<\/h2>\n\n\n\n

\u6709 3\u79cd\u6784\u9020\u65b9\u6cd5\uff0c1\u79cd\u76f4\u63a5\u521b\u5efa<\/p>\n\n\n\n

String str1 = new String(\"\"); \/\/\u91cc\u9762\u6ca1\u6709\u53cc\u5f15\u53f7\u65f6\uff0c\u4e5f\u662f\u7a7a\u5b57\u7b26\u4e32\n\nchar[] charArray = {'A','B','C'};\nString str2 = new String(charArray); \/\/\u6839\u636e\u5b57\u7b26\u6570\u7ec4\u521b\u5efa\n\nbyte[] byteArray = {97,98,99};\nString str3 = new String(byteArray); \/\/\u6839\u636e\u5b57\u8282\u6570\u7ec4\u521b\u5efa\n\nString str4 = \"hehe\";  \/\/\u6839\u636e\u53cc\u5f15\u53f7\u76f4\u63a5\u521b\u5efa<\/code><\/pre>\n\n\n\n
\u76f4\u63a5\u521b\u5efa\u7684\u5b57\u7b26\u4e32\uff0c\u4f1a\u8fdb\u5165\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\uff0c\u53ef\u4ee5\u4f7f\u7528 == \u5224\u65ad<\/p>\n\n\n\n
\u65b9\u6cd5<\/h2>\n\n\n\n
1.\u6bd4\u8f83\u5185\u5bb9\u662f\u5426\u76f8\u540c<\/p>\n\n\n\n
String str1 = new String(\"hehe\");\nString str2 = new String(\"hehe\");\nSystem.out.println(str1 == str2); \/\/false\nSystem.out.println(str1.equals(str2));\/\/true\n\n\/\/\u6bd4\u8f83\u5185\u5bb9\u662f\u5426\u76f8\u540c\uff0c\u5ffd\u7565\u5b57\u6bcd\u5927\u5c0f\u5199\nString str3 = new String(\"hehe\");\nString str4 = new String(\"HeHe\");\nSystem.out.println(str3.equals(str4)); \/\/false\nSystem.out.println(str3.equalsIgnoreCase(str4)); \/\/true<\/code><\/pre>\n\n\n\n
\uff08\u5982\u679c\u524d\u9762\u7684\u5b57\u7b26\u4e32\u503c\u662fnull\uff0c\u90a3\u4e48\u4f1a\u62a5\u7a7a\u6307\u9488\u5f02\u5e38\uff09<\/p>\n\n\n\n
2.\u5b57\u7b26\u4e32\u83b7\u53d6\u957f\u5ea6\uff0c\u5355\u4e2a\u5b57\u7b26\uff0c\u5b50\u4e32\u4f4d\u7f6e<\/p>\n\n\n\n
int length = \"fdsaagweffdsvcv\".length();\nSystem.out.println(\"\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u662f\uff1a\"+length);\n\n\/\/\u83b7\u53d6\u6307\u5b9a\u7d22\u5f15\u7684\u5355\u4e2a\u5b57\u7b26\nchar ch = \"Hello\".charAt(1);\nSystem.out.println(ch); \/\/e\n\n\/\/\u83b7\u53d6\u5b50\u4e32\u5728\u9996\u6b21\u4f4d\u7f6e\nString old = \"HelloWorld\";\nint index1 = old.indexOf(\"l\");   \/\/\u4ece\u5de6\u8fb9\u5f00\u59cb\nint index2 = old.lastIndexOf(\"l\"); \/\/\u4ece\u53f3\u8fb9\u5f00\u59cb\nSystem.out.println(index1); \/\/2\nSystem.out.println(index2); \/\/8<\/code><\/pre>\n\n\n\n
3.\u62fc\u63a5\u5b57\u7b26\u4e32<\/p>\n\n\n\n
String str1 = \"Hello\";\nString str2 = \"World\";\nString str3 =  str1.concat(str2);\nSystem.out.println(str3);  \/\/ HelloWorld\n\n\/\/\u7b80\u5316\u5199\u6cd5\uff0c\u4f7f\u7528 str3 = str1 + str2;<\/code><\/pre>\n\n\n\n
4.\u5b57\u7b26\u4e32\u7684\u622a\u53d6<\/p>\n\n\n\n
String str1 = \"HelloWorld\";\nString str2 = str1.substring(5); \/\/\u4ece\u5f00\u59cb\u4f4d\u7f6e\u5230\u7ed3\u675f\nString str3 = str1.substring(0,5); \/\/\u7ed9\u5b9a\u5f00\u59cb\u4f4d\u7f6e\u548c\u7ed3\u675f\u4f4d\u7f6e\nSystem.out.println(str2); \/\/ World\nSystem.out.println(str3); \/\/ Hello<\/code><\/pre>\n\n\n\n
5.\u5b57\u7b26\u4e32\u7684\u8f6c\u6362<\/p>\n\n\n\n
char[] chars = \"Hello\".toCharArray(); \/\/\u8f6c\u6362\u4e3a\u5b57\u7b26\u6570\u7ec4\nSystem.out.println(Arrays.toString(chars));\n\nbyte[] bytes = \"Hello\".getBytes();  \/\/\u8f6c\u6362\u4e3a\u5b57\u8282\u6570\u7ec4\nSystem.out.println(Arrays.toString(bytes));\n\nString str1 = \"How old are you?\";\nString str2 = str1.replace(\"o\",\"*\"); \/\/\u5b57\u7b26\u4e32\u5185\u5bb9\u7684\u66ff\u6362\nSystem.out.println(str2);\/\/H*w *ld are y*u?<\/code><\/pre>\n\n\n\n
6.\u5b57\u7b26\u4e32\u7684\u5206\u5272<\/p>\n\n\n\n
String str1 = \"aaa,bbb,ccc\";\nString[] array1 = str1.split(\",\");  \n\/\/\u53c2\u6570\u662f\u4e2a\u6b63\u5219\u8868\u8fbe\u5f0f\uff0c\u62a5\u9519\u540e\u65e0\u6cd5\u5206\u5272\uff0c\u5982\u679c\u662f\".\"\u4e0d\u80fd\u8fd9\u4e48\u5199\uff0c\u800c\u662f\"\\\\.\"\nSystem.out.println(Arrays.toString(array1));<\/code><\/pre>\n\n\n\n
7.\u5224\u65ad\u6b64\u5b57\u7b26\u4e32\u7684\u5f00\u5934\u548c\u7ed3\u5c3e<\/p>\n\n\n\n
String s = \"Hello,Java.txt\";\nboolean b1 = s.startsWith(\"He\");\n  \/\/\u662f\u5426\u4ee5He\u5f00\u5934\nSystem.out.println(b1);     \/\/true\nboolean b2 = s.endsWith(\".txt\"); \n \/\/\u662f\u5426\u4ee5.txt\u7ed3\u5c3e\nSystem.out.println(b2);     \/\/true<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
String \u7c7b\u662f\u57fa\u672c\u6570\u636e\u7c7b\u578b\u4e4b\u4e00\uff0c\u5b98\u65b9\u6587\u6863\u4f20\u9001\u95e8\uff1ajava.lang.String String \u662f\u4e00\u79cd\u5e38\u91cf… \u7ee7\u7eed\u9605\u8bfb java.lang.String<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[5],"tags":[],"_links":{"self":[{"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/posts\/80"}],"collection":[{"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/comments?post=80"}],"version-history":[{"count":0,"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/posts\/80\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/media?parent=80"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/categories?post=80"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/tags?post=80"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}