\u8bbe\u8ba1\u6a21\u5f0f4:\u5355\u4f8b\u6a21\u5f0f
\n\u5355\u4f8b\u6a21\u5f0f\uff1a\u786e\u4fdd\u67d0\u4e00\u4e2a\u7c7b\u53ea\u6709\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u800c\u4e14\u81ea\u884c\u5b9e\u4f8b\u5316\u5e76\u5411\u6574\u4e2a\u7cfb\u7edf\u63d0\u4f9b\u8fd9\u4e2a\u5b9e\u4f8b\u3002
\n\u5176\u8be6\u7ec6\u5185\u5bb9\u53ef\u4ee5\u7b80\u5355\u7684\u5206\u4e3a\u4e24\u79cd\uff1a
\n1\uff09\u997f\u6c49\u5f0f\u5355\u5229\u6a21\u5f0f\uff08java\u7f16\u7a0b\u4e2d\u63a8\u8350\u4f7f\u7528\u6b64\u6a21\u5f0f\uff09\uff0c\u7279\u5f81\uff1a
\na.\u5728\u4e00\u4e2a\u79c1\u6709\u7684\u9759\u6001\u53d8\u91cf\u4e2d\u8fdb\u884c\u5b9e\u4f8b\u5316
\nb.\u6784\u9020\u51fd\u6570\u662f\u79c1\u6709\u7684
\nc.\u5728\u4e00\u4e2a\u9759\u6001\u65b9\u6cd5\u4e2d\u8fd4\u56de\u8be5\u7c7b\u7684\u5b9e\u4f8b\uff08\u5373\u524d\u9762\u58f0\u660e\u7684\u9759\u6001\u53d8\u91cf\uff09\uff0c\u5916\u90e8\u7c7b\u901a\u8fc7\u8fd9\u4e2a\u9759\u6001\u7684\u65b9\u6cd5\u5f97\u5230\u8be5\u7c7b\u7684\u5b9e\u4f8b
\nd.\u56e0\u4e3a\u5728\u7cfb\u7edf\u4e2d\u59cb\u7ec8\u6709\u4e00\u4e2a\u81ea\u5df1\u7684\u5f15\u7528\uff0c\u6240\u4ee5\u5b9e\u4f8b\u5bf9\u8c61\u4e0d\u4f1a\u88ab\u5783\u573e\u6536\u96c6\u5668\u6536\u56de\uff0c\u5c06\u5728\u7cfb\u7edf\u4e2d\u4e00\u76f4\u5b58\u5728\u76f4\u5230\u7cfb\u7edf\u91cd\u542f\u3002
\n\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
[code lang=”java”]
\npublic class EargerSingleton {
\n\/\/ \u79c1\u6709\u9759\u6001\u5c5e\u6027
\nprivate static final EargerSingleton eargerSingleton = new EargerSingleton();
\n private EargerSingleton() {
\n }
\n public static EargerSingleton getInstance() {
\n return eargerSingleton;
\n }
\n}
\n[\/code]<\/p>\n
2.\u61d2\u6c49\u5f0f\u5355\u4f8b\u6a21\u5f0f\uff0c\u7279\u5f81\uff1a\u4e0e\u997f\u6c49\u5f0f\u5355\u4f8b\u6a21\u5f0f\u57fa\u672c\u76f8\u540c\uff0c\u4e0d\u540c\u7684\u662f\u5b9e\u4f8b\u7684\u83b7\u5f97\u662f\u5728\u8be5\u7c7b\u88ab\u7b2c\u4e00\u6b21\u5f15\u7528\u65f6\u3002
\n\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
[code lang=”java”]
\npublic class LazySigleton {
\n private static LazySigleton lazySigleton = null;<\/p>\n
private LazySigleton() {
\n }<\/p>\n
synchronized public static LazySigleton getInstance() {
\n if (lazySigleton == null) {
\n lazySigleton = new LazySigleton();
\n }
\n return lazySigleton;
\n }
\n}
\n[\/code]<\/p>\n
\u6ce8\u610f\u4e0a\u9762\u7684\u61d2\u6c49\u6a21\u5f0f\u4e2d\u4f7f\u7528\u4e86\u540c\u6b65\u9501\uff08synchronized\uff09\uff0c\u662f\u4e3a\u4e86\u9632\u6b62\u5728\u591a\u7ebf\u7a0b\u4f7f\u7528\u65f6\u53ef\u80fd\u540c\u65f6\u521d\u59cb\u5316\u591a\u4e2a\u5b9e\u4f8b\u7684\u60c5\u51b5\u51fa\u73b0\u3002\u5728\u8d44\u6e90\u5229\u7528\u4e0a\u61d2\u6c49\u6a21\u5f0f\u6bd4\u997f\u6c49\u6a21\u5f0f\u8981\u597d\u4e00\u4e9b\uff0c\u4f46\u662f\u5728\u901f\u5ea6\u548c\u53cd\u5e94\u65f6\u95f4\u4e0a\u5219\u900a\u8272\u4e8e\u997f\u6c49\u6a21\u5f0f\u3002
\n\u7531\u4e8e\u8fd9\u4e24\u79cd\u6a21\u5f0f\u7684\u6784\u9020\u65b9\u6cd5\u90fd\u662f\u79c1\u6709\u7684\uff0c\u5bfc\u81f4\u8fd9\u4e24\u4e2a\u7c7b\u90fd\u662f\u4e0d\u80fd\u88ab\u7ee7\u627f\u7684\u3002
\n3.\u767b\u8bb0\u5f0f\u5355\u4f8b\u6a21\u5f0f\u3002\u4e3a\u4e86\u89e3\u51b3\u524d\u4e24\u8005\u7684\u7c7b\u4e0d\u80fd\u88ab\u7ee7\u627f\u800c\u8bbe\u8ba1\u3002
\n\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n
[code lang=”java”]
\npublic class RegSingleton {
\n static private HashMap<String, RegSingleton> regMap = new HashMap<String, RegSingleton>();
\n static {
\n RegSingleton regSingleton = new RegSingleton();
\n regMap.put(regSingleton.getClass().getName(), regSingleton);
\n }<\/p>\n
\/**
\n * \u53d7\u4fdd\u62a4\u7684\u9ed8\u8ba4\u6784\u9020\u51fd\u6570
\n *\/
\n protected RegSingleton() {<\/p>\n
}<\/p>\n
public static RegSingleton getInstance(String name) {
\n if ("".equals(name) || null == name) {
\n name = "gof.singleton.RegSingleton";<\/p>\n
}
\n if (regMap.get(name) == null) {<\/p>\n
try {
\n regMap.put(name, (RegSingleton) Class.forName(name).newInstance());
\n } catch (InstantiationException e) {
\n e.printStackTrace();
\n } catch (IllegalAccessException e) {
\n e.printStackTrace();
\n } catch (ClassNotFoundException e) {
\n e.printStackTrace();
\n }
\n }
\n return regMap.get(name);<\/p>\n
}
\n}
\n[\/code]<\/p>\n
\u4f7f\u7528\u5355\u4f8b\u6a21\u5f0f\u7684\u6761\u4ef6\uff1a\u4e00\u4e2a\u7cfb\u7edf\u8981\u6c42\u4e00\u4e2a\u7c7b\u53ea\u6709\u4e00\u4e2a\u5b9e\u4f8b\u7684\u65f6\u5019\u624d\u4f7f\u7528\u8be5\u6a21\u5f0f\u3002
\n\u5982\u679c\u4e00\u4e2a\u7cfb\u7edf\u4e2d\u5355\u4f8b\u7c7b\u5df2\u7ecf\u88ab\u4f7f\u7528\uff0c\u800c\u5728\u8fd9\u4e2a\u65f6\u5019\u53c8\u60f3\u5f97\u5230\u8fd9\u4e2a\u7c7b\u7684\u591a\u4e2a\u5b9e\u4f8b\u65f6\uff0c\u90a3\u4e48\u5c31\u53ef\u4ee5\u91c7\u7528\u591a\u4f8b\u6a21\u5f0f.<\/p>\n
\u591a\u4f8b\u6a21\u5f0f\uff0c\u662f\u5bf9\u5355\u4f8b\u6a21\u5f0f\u7684\u63a8\u5e7f\uff1a
\n\u7279\u5f81\uff1a
\n1\uff09\u3002\u591a\u4f8b\u7c7b\u53ef\u4ee5\u6709\u591a\u4e2a\u5b9e\u4f8b
\n2\uff09\u591a\u4f8b\u7c7b\u5fc5\u987b\u81ea\u5df1\u521b\u5efa\uff0c\u81ea\u5df1\u7ba1\u7406\u81ea\u5df1\u7684\u5b9e\u4f8b\uff0c\u5e76\u5411\u5916\u754c\u63d0\u4f9b\u81ea\u5df1\u7684\u5b9e\u4f8b
\n\u4e3e\u4f8b\u5982\uff1a\u6253\u9ebb\u5c06\u6bcf\u4e00\u5c40\u90fd\u9700\u8981\u4e24\u4e2a\u9ab0\u5b50\uff0c\u56e0\u4e3a\u9ab0\u5b50\u662f\u76f8\u540c\u7684\uff0c\u4f46\u662f\u53ea\u9700\u8981\u4e24\u4e2a\u5b9e\u4f8b\uff0c\u90a3\u4e48\u9ab0\u5b50\u7684\u5b9e\u73b0\u7c7b\u4e2d\u5c31\u53ef\u4ee5\u6709\u4e24\u4e2a\u5b9e\u4f8b\u51fa\u73b0\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
[code lang=”java”]
\npublic class Die{
\n\tprivate static Die die1 = new Die();
\n\tprivate static Die die2 = new Die();
\n\/\/\u4e0b\u9762\u8fdb\u884c\u7c7b\u4f3c\u997f\u6c49\u5355\u4f8b\u6a21\u5f0f\u7684\u5b9e\u73b0
\n}
\n[\/code]<\/p>\n
\u5f53\u591a\u4f8b\u6a21\u5f0f\u91cc\u9700\u8981\u7ba1\u7406\u7684\u5b9e\u4f8b\u8f83\u591a\u65f6\u53ef\u4ee5\u53c2\u8003\u4e0b\u9762\u7684\u7c7b\u8fdb\u884c\u7ba1\u7406\uff1a<\/p>\n
[code lang=”java”]
\npublic class LingualResource {
\n\t\/\/ \u5c5e\u6027\u58f0\u660e
\n\tprivate String language = "en";
\n\tprivate String region = "US";
\n\tprivate String localeCode = "en_US";
\n\tprivate static HashMap instances = new HashMap(19);
\n\tprivate static String FILE_NAME = "res";
\n\tprivate Locale locale = null;
\n\tprivate ResourceBundle resourceBundle = null;
\n\tprivate LingualResource lnkLingualResource;<\/p>\n
\t\/\/ \u79c1\u6709\u6784\u9020\u65b9\u6cd5
\n\tprivate LingualResource() {
\n\t}<\/p>\n
\t\/**
\n\t * @param language
\n\t * @param region2
\n\t *\/
\n\tprivate LingualResource(String language, String region2) {
\n\t\tthis.localeCode = language;
\n\t\tthis.region = region2;
\n\t\tlocaleCode = makeLocaleResource(language, region2);
\n\t\tlocale = new Locale(language, region2);
\n\t\tresourceBundle = ResourceBundle.getBundle(FILE_NAME, locale);
\n\t\tinstances.put(makeLocaleResource(language, region2), resourceBundle);
\n\t}<\/p>\n
\tpublic static synchronized LingualResource getInstance(String language,
\n\t\t\tString region) {
\n\t\tString localeCode = makeLocaleResource(language, region);
\n\t\tif (instances.get(localeCode) != null) {
\n\t\t\treturn (LingualResource) instances.get(localeCode);
\n\t\t} else {
\n\t\t\treturn new LingualResource(language, region);
\n\t\t}<\/p>\n