\u4e03\u3001\u4f7f\u7528\u9759\u6001\u4ee3\u7801\u5757\u5b9e\u73b0\u8d4b\u503c\u9759\u6001\u6210\u5458\u53d8\u91cf<\/strong><\/div>\n
\u5bf9\u4e8e\u96c6\u5408\u7c7b\u578b\u7684\u9759\u6001\u6210\u5458\u53d8\u91cf\uff0c\u5e94\u8be5\u4f7f\u7528\u9759\u6001\u4ee3\u7801\u5757\u8d4b\u503c\uff0c\u800c\u4e0d\u662f\u4f7f\u7528\u96c6\u5408\u5b9e\u73b0\u6765\u8d4b\u503c\u3002<\/p>\n
\u53cd\u4f8b\uff1a<\/p>\n
\r\n \/\/\u8d4b\u503c\u9759\u6001\u6210\u5458\u53d8\u91cf\u53cd\u4f8b \r\n private static Map map = new HashMap(){ \r\n { \r\n map.put(\"Leo\",1); \r\n map.put(\"Family-loving\",2); \r\n map.put(\"Cold on the out side passionate on the inside\",3); \r\n } \r\n }; \r\n private static List list = new ArrayList<>(){ \r\n { \r\n list.add(\"Sagittarius\"); \r\n list.add(\"Charming\"); \r\n list.add(\"Perfectionist\"); \r\n } \r\n }; \r\n<\/string><\/pre>\n
\u6b63\u4f8b\uff1a<\/p>\n
\r\n \/\/\u8d4b\u503c\u9759\u6001\u6210\u5458\u53d8\u91cf\u6b63\u4f8b \r\n private static Map map = new HashMap(); \r\n static { \r\n map.put(\"Leo\",1); \r\n map.put(\"Family-loving\",2); \r\n map.put(\"Cold on the out side passionate on the inside\",3); \r\n } \r\n private static List list = new ArrayList<>(); \r\n static { \r\n list.add(\"Sagittarius\"); \r\n list.add(\"Charming\"); \r\n list.add(\"Perfectionist\"); \r\n } \r\n<\/string><\/pre>\n
\u516b\u3001\u5220\u9664\u672a\u4f7f\u7528\u7684\u5c40\u90e8\u53d8\u91cf\u3001\u65b9\u6cd5\u53c2\u6570\u3001\u79c1\u6709\u65b9\u6cd5\u3001\u5b57\u6bb5\u548c\u591a\u4f59\u7684\u62ec\u53f7\u3002<\/strong><\/div>\n
\u4e5d\u3001\u5de5\u5177\u7c7b\u4e2d\u5c4f\u853d\u6784\u9020\u51fd\u6570<\/strong><\/div>\n
\u5de5\u5177\u7c7b\u662f\u4e00\u5806\u9759\u6001\u5b57\u6bb5\u548c\u51fd\u6570\u7684\u96c6\u5408\uff0c\u5176\u4e0d\u5e94\u8be5\u88ab\u5b9e\u4f8b\u5316\uff1b\u4f46\u662f\uff0cJava \u4e3a\u6bcf\u4e2a\u6ca1\u6709\u660e\u786e\u5b9a\u4e49\u6784\u9020\u51fd\u6570\u7684\u7c7b\u6dfb\u52a0\u4e86\u4e00\u4e2a\u9690\u5f0f\u516c\u6709\u6784\u9020\u51fd\u6570\uff0c\u4e3a\u4e86\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u5b9e\u4f8b\u5316\uff0c\u5e94\u8be5\u663e\u5f0f\u5b9a\u4e49\u79c1\u6709\u6784\u9020\u51fd\u6570\u6765\u5c4f\u853d\u8fd9\u4e2a\u9690\u5f0f\u516c\u6709\u6784\u9020\u51fd\u6570\u3002<\/p>\n
\u53cd\u4f8b\uff1a<\/p>\n
\r\n public class PasswordUtils { \r\n \/\/\u5de5\u5177\u7c7b\u6784\u9020\u51fd\u6570\u53cd\u4f8b \r\n private static final Logger LOG = LoggerFactory.getLogger(PasswordUtils.class); \r\n public static final String DEFAULT_CRYPT_ALGO = \"PBEWithMD5AndDES\"; \r\n public static String encryptPassword(String aPassword) throws IOException { \r\n return new PasswordUtils(aPassword).encrypt(); \r\n } \r\n<\/pre>\n
\u6b63\u4f8b\uff1a<\/p>\n
\r\n public class PasswordUtils { \r\n \/\/\u5de5\u5177\u7c7b\u6784\u9020\u51fd\u6570\u6b63\u4f8b \r\n private static final Logger LOG = LoggerFactory.getLogger(PasswordUtils.class); \r\n \/\/\u5b9a\u4e49\u79c1\u6709\u6784\u9020\u51fd\u6570\u6765\u5c4f\u853d\u8fd9\u4e2a\u9690\u5f0f\u516c\u6709\u6784\u9020\u51fd\u6570 \r\n private PasswordUtils(){} \r\n public static final String DEFAULT_CRYPT_ALGO = \"PBEWithMD5AndDES\"; \r\n public static String encryptPassword(String aPassword) throws IOException { \r\n return new PasswordUtils(aPassword).encrypt(); \r\n } \r\n<\/pre>\n
\u5341\u3001\u5220\u9664\u591a\u4f59\u7684\u5f02\u5e38\u6355\u83b7\u5e76\u8dd1\u51fa<\/strong><\/div>\n
\u7528catch \u8bed\u53e5\u6355\u83b7\u5f02\u5e38\u540e\uff0c\u82e5\u4ec0\u4e48\u4e5f\u4e0d\u8fdb\u884c\u5904\u7406\uff0c\u5c31\u53ea\u662f\u8ba9\u5f02\u5e38\u91cd\u65b0\u629b\u51fa\uff0c\u8fd9\u8ddf\u4e0d\u6355\u83b7\u5f02\u5e38\u7684\u6548\u679c\u4e00\u6837\uff0c\u53ef\u4ee5\u5220\u9664\u8fd9\u5757\u4ee3\u7801\u6216\u6dfb\u52a0\u522b\u7684\u5904\u7406\u3002<\/p>\n
\u53cd\u4f8b\uff1a<\/p>\n
\r\n \/\/\u591a\u4f59\u5f02\u5e38\u53cd\u4f8b \r\n private static String fileReader(String fileName)throws IOException{ \r\n try (BufferedReader reader = new BufferedReader(new FileReader(fileName))) { \r\n String line; \r\n StringBuilder builder = new StringBuilder(); \r\n while ((line = reader.readLine()) != null) { \r\n builder.append(line); \r\n } \r\n return builder.toString(); \r\n } catch (Exception e) { \r\n \/\/\u4ec5\u4ec5\u662f\u91cd\u590d\u629b\u5f02\u5e38 \u672a\u4f5c\u4efb\u4f55\u5904\u7406 \r\n throw e; \r\n } \r\n } \r\n<\/pre>\n
\u6b63\u4f8b\uff1a<\/p>\n
\r\n \/\/\u591a\u4f59\u5f02\u5e38\u6b63\u4f8b \r\n private static String fileReader(String fileName)throws IOException{ \r\n try (BufferedReader reader = new BufferedReader(new FileReader(fileName))) { \r\n String line; \r\n StringBuilder builder = new StringBuilder(); \r\n while ((line = reader.readLine()) != null) { \r\n builder.append(line); \r\n } \r\n return builder.toString(); \r\n \/\/\u5220\u9664\u591a\u4f59\u7684\u629b\u5f02\u5e38\uff0c\u6216\u589e\u52a0\u5176\u4ed6\u5904\u7406\uff1a \r\n \/*catch (Exception e) { \r\n return \"fileReader exception\"; \r\n }*\/ \r\n } \r\n } \r\n<\/pre>\n
\u5341\u4e00\u3001\u5b57\u7b26\u4e32\u8f6c\u5316\u4f7f\u7528String.valueOf(value) \u4ee3\u66ff \" \" + value<\/strong><\/div>\n
\u628a\u5176\u5b83\u5bf9\u8c61\u6216\u7c7b\u578b\u8f6c\u5316\u4e3a\u5b57\u7b26\u4e32\u65f6\uff0c\u4f7f\u7528String.valueOf(value) \u6bd4 \"\"+value \u7684\u6548\u7387\u66f4\u9ad8\u3002<\/p>\n
\u53cd\u4f8b\uff1a<\/p>\n
\r\n \/\/\u628a\u5176\u5b83\u5bf9\u8c61\u6216\u7c7b\u578b\u8f6c\u5316\u4e3a\u5b57\u7b26\u4e32\u53cd\u4f8b\uff1a \r\n int num = 520; \r\n \/\/ \"\" + value \r\n String strLove = \"\" + num; \r\n<\/pre>\n
\u6b63\u4f8b\uff1a<\/p>\n
\r\n \/\/\u628a\u5176\u5b83\u5bf9\u8c61\u6216\u7c7b\u578b\u8f6c\u5316\u4e3a\u5b57\u7b26\u4e32\u6b63\u4f8b\uff1a \r\n int num = 520; \r\n \/\/ String.valueOf() \u6548\u7387\u66f4\u9ad8 \r\n String strLove = String.valueOf(num); \r\n<\/pre>\n
\u5341\u4e8c\u3001\u907f\u514d\u4f7f\u7528BigDecimal(double)<\/strong><\/div>\n
BigDecimal(double) \u5b58\u5728\u7cbe\u5ea6\u635f\u5931\u98ce\u9669\uff0c\u5728\u7cbe\u786e\u8ba1\u7b97\u6216\u503c\u6bd4\u8f83\u7684\u573a\u666f\u4e2d\u53ef\u80fd\u4f1a\u5bfc\u81f4\u4e1a\u52a1\u903b\u8f91\u5f02\u5e38\u3002<\/p>\n
\u53cd\u4f8b\uff1a<\/p>\n
\r\n \/\/ BigDecimal \u53cd\u4f8b \r\n BigDecimal bigDecimal = new BigDecimal(0.11D); \r\n<\/pre>\n
\u6b63\u4f8b\uff1a<\/p>\n
\r\n \/\/ BigDecimal \u6b63\u4f8b \r\n BigDecimal bigDecimalbigDecimal1 = bigDecimal.valueOf(0.11D); \r\n<\/pre>\n
\u5341\u4e09\u3001\u8fd4\u56de\u7a7a\u6570\u7ec4\u548c\u96c6\u5408\u800c\u975e null<\/strong><\/div>\n
\u82e5\u7a0b\u5e8f\u8fd0\u884c\u8fd4\u56denull\uff0c\u9700\u8981\u8c03\u7528\u65b9\u5f3a\u5236\u68c0\u6d4bnull\uff0c\u5426\u5219\u5c31\u4f1a\u629b\u51fa\u7a7a\u6307\u9488\u5f02\u5e38\uff1b\u8fd4\u56de\u7a7a\u6570\u7ec4\u6216\u7a7a\u96c6\u5408\uff0c\u6709\u6548\u5730\u907f\u514d\u4e86\u8c03\u7528\u65b9\u56e0\u4e3a\u672a\u68c0\u6d4bnull \u800c\u629b\u51fa\u7a7a\u6307\u9488\u5f02\u5e38\u7684\u60c5\u51b5\uff0c\u8fd8\u53ef\u4ee5\u5220\u9664\u8c03\u7528\u65b9\u68c0\u6d4bnull \u7684\u8bed\u53e5\u4f7f\u4ee3\u7801\u66f4\u7b80\u6d01\u3002<\/p>\n
\u53cd\u4f8b\uff1a<\/p>\n
\r\n \/\/\u8fd4\u56denull \u53cd\u4f8b \r\n public static Result[] getResults() { \r\n return null; \r\n } \r\n public static List getResultList() { \r\n return null; \r\n } \r\n public static Map getResultMap() { \r\n return null; \r\n } \r\n<\/result><\/pre>\n
\u6b63\u4f8b\uff1a<\/p>\n
\r\n \/\/\u8fd4\u56de\u7a7a\u6570\u7ec4\u548c\u7a7a\u96c6\u6b63\u4f8b \r\n public static Result[] getResults() { \r\n return new Result[0]; \r\n } \r\n public static List getResultList() { \r\n return Collections.emptyList(); \r\n } \r\n public static Map getResultMap() { \r\n return Collections.emptyMap(); \r\n } \r\n<\/result><\/pre>\n
\u5341\u56db\u3001\u4f18\u5148\u4f7f\u7528\u5e38\u91cf\u6216\u786e\u5b9a\u503c\u8c03\u7528equals \u65b9\u6cd5<\/strong><\/div>\n
\u5bf9\u8c61\u7684equals \u65b9\u6cd5\u5bb9\u6613\u629b\u7a7a\u6307\u9488\u5f02\u5e38\uff0c\u5e94\u4f7f\u7528\u5e38\u91cf\u6216\u786e\u5b9a\u6709\u503c\u7684\u5bf9\u8c61\u6765\u8c03\u7528equals \u65b9\u6cd5\u3002<\/p>\n
\u53cd\u4f8b\uff1a<\/p>\n
\r\n \/\/\u8c03\u7528 equals \u65b9\u6cd5\u53cd\u4f8b \r\n private static boolean fileReader(String fileName)throws IOException{ \r\n \/\/ \u53ef\u80fd\u629b\u7a7a\u6307\u9488\u5f02\u5e38 \r\n return fileName.equals(\"Charming\"); \r\n } \r\n<\/pre>\n
\u6b63\u4f8b\uff1a<\/p>\n
\r\n \/\/\u8c03\u7528 equals \u65b9\u6cd5\u6b63\u4f8b \r\n private static boolean fileReader(String fileName)throws IOException{ \r\n \/\/ \u4f7f\u7528\u5e38\u91cf\u6216\u786e\u5b9a\u6709\u503c\u7684\u5bf9\u8c61\u6765\u8c03\u7528 equals \u65b9\u6cd5 \r\n return \"Charming\".equals(fileName); \r\n \/\/\u6216\u4f7f\u7528\uff1ajava.util.Objects.equals() \u65b9\u6cd5 \r\n return Objects.equals(\"Charming\",fileName); \r\n } \r\n<\/pre>\n
\u5341\u4e94\u3001\u679a\u4e3e\u7684\u5c5e\u6027\u5b57\u6bb5\u5fc5\u987b\u662f\u79c1\u6709\u4e14\u4e0d\u53ef\u53d8<\/strong><\/div>\n
\u679a\u4e3e\u901a\u5e38\u88ab\u5f53\u505a\u5e38\u91cf\u4f7f\u7528\uff0c\u5982\u679c\u679a\u4e3e\u4e2d\u5b58\u5728\u516c\u5171\u5c5e\u6027\u5b57\u6bb5\u6216\u8bbe\u7f6e\u5b57\u6bb5\u65b9\u6cd5\uff0c\u90a3\u4e48\u8fd9\u4e9b\u679a\u4e3e\u5e38\u91cf\u7684\u5c5e\u6027\u5f88\u5bb9\u6613\u88ab\u4fee\u6539\uff1b\u7406\u60f3\u60c5\u51b5\u4e0b\uff0c\u679a\u4e3e\u4e2d\u7684\u5c5e\u6027\u5b57\u6bb5\u662f\u79c1\u6709\u7684\uff0c\u5e76\u5728\u79c1\u6709\u6784\u9020\u51fd\u6570\u4e2d\u8d4b\u503c\uff0c\u6ca1\u6709\u5bf9\u5e94\u7684Setter \u65b9\u6cd5\uff0c\u6700\u597d\u52a0\u4e0afinal \u4fee\u9970\u7b26\u3002<\/p>\n
\u53cd\u4f8b\uff1a<\/p>\n
\r\n public enum SwitchStatus { \r\n \/\/ \u679a\u4e3e\u7684\u5c5e\u6027\u5b57\u6bb5\u53cd\u4f8b \r\n DISABLED(0, \"\u7981\u7528\"), \r\n ENABLED(1, \"\u542f\u7528\"); \r\n public int value; \r\n private String description; \r\n private SwitchStatus(int value, String description) { \r\n this.value = value; \r\n this.description = description; \r\n } \r\n public String getDescription() { \r\n return description; \r\n } \r\n public void setDescription(String description) { \r\n this.description = description; \r\n } \r\n } \r\n<\/pre>\n
\u6b63\u4f8b\uff1a<\/p>\n
\r\n public enum SwitchStatus { \r\n \/\/ \u679a\u4e3e\u7684\u5c5e\u6027\u5b57\u6bb5\u6b63\u4f8b \r\n DISABLED(0, \"\u7981\u7528\"), \r\n ENABLED(1, \"\u542f\u7528\"); \r\n \/\/ final \u4fee\u9970 \r\n private final int value; \r\n private final String description; \r\n private SwitchStatus(int value, String description) { \r\n this.value = value; \r\n this.description = description; \r\n } \r\n \/\/ \u6ca1\u6709Setter \u65b9\u6cd5 \r\n public int getValue() { \r\n return value; \r\n } \r\n public String getDescription() { \r\n return description; \r\n } \r\n } \r\n<\/pre>\n
\u5341\u516d\u3001tring.split(String regex)\u90e8\u5206\u5173\u952e\u5b57\u9700\u8981\u8f6c\u8bd1<\/strong><\/div>\n
\u4f7f\u7528\u5b57\u7b26\u4e32String \u7684plit \u65b9\u6cd5\u65f6\uff0c\u4f20\u5165\u7684\u5206\u9694\u5b57\u7b26\u4e32\u662f\u6b63\u5219\u8868\u8fbe\u5f0f\uff0c\u5219\u90e8\u5206\u5173\u952e\u5b57\uff08\u6bd4\u5982 .[]()| \u7b49\uff09\u9700\u8981\u8f6c\u4e49\u3002<\/p>\n
\u53cd\u4f8b\uff1a<\/p>\n
\r\n \/\/ String.split(String regex) \u53cd\u4f8b \r\n String[] split = \"a.ab.abc\".split(\".\"); \r\n System.out.println(Arrays.toString(split)); \/\/ \u7ed3\u679c\u4e3a[] \r\n String[] split1 = \"a|ab|abc\".split(\"|\"); \r\n System.out.println(Arrays.toString(split1)); \/\/ \u7ed3\u679c\u4e3a[\"a\", \"|\", \"a\", \"b\", \"|\", \"a\", \"b\", \"c\"] \r\n<\/pre>\n
\u6b63\u4f8b\uff1a<\/p>\n
\r\n \/\/ String.split(String regex) \u6b63\u4f8b \r\n \/\/ . \u9700\u8981\u8f6c\u8bd1 \r\n String[] split2 = \"a.ab.abc\".split(\"\\\\.\"); \r\n System.out.println(Arrays.toString(split2)); \/\/ \u7ed3\u679c\u4e3a[\"a\", \"ab\", \"abc\"] \r\n \/\/ | \u9700\u8981\u8f6c\u8bd1 \r\n String[] split3 = \"a|ab|abc\".split(\"\\\\|\"); \r\n System.out.println(Arrays.toString(split3)); \/\/ \u7ed3\u679c\u4e3a[\"a\", \"ab\", \"abc\"] \r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"
\u5f53\u9047\u5230\u591a\u4e2a\u67e5\u8be2\u6761\u4ef6\uff0c\u4f7f\u7528where 1=1 \u53ef\u4ee5\u5f88\u65b9\u4fbf\u7684\u89e3\u51b3\u6211\u4eec\u7684\u95ee\u9898\uff0c\u4f46\u662f\u8fd9\u6837\u5f88\u53ef\u80fd\u4f1a\u9020\u6210\u975e\u5e38\u5927\u7684\u6027\u80fd\u635f\u5931\uff0c […]<\/p>\n","protected":false},"author":1898,"featured_media":202209,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[55],"tags":[606],"class_list":["post-202206","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-thread","tag-606"],"acf":[],"_links":{"self":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/202206","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/users\/1898"}],"replies":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/comments?post=202206"}],"version-history":[{"count":5,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/202206\/revisions"}],"predecessor-version":[{"id":202215,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/202206\/revisions\/202215"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/media\/202209"}],"wp:attachment":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/media?parent=202206"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/categories?post=202206"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/tags?post=202206"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}