http:\/\/java.ccidnet.com\/art\/3759\/20060404\/496977_1.html<\/p>\n
\u524d\u6bb5\u65f6\u95f4\u56e0\u4e3a\u8981\u53c2\u52a0\u4e00\u4e2a\u7b14\u8bd5\uff0c\u5728\u51c6\u5907\u671f\u95f4\u5728\u7f51\u4e0a\u627e\u5230\u4e86\u4e24\u6761\u5173\u4e8e\u7b14\u8bd5\u9898\u76ee\u7684\u6587\u7ae0\uff0c\u5176\u4e2d\u4e00\u7bc7\u4e3a<<\u6709\u611f:\u5e94\u8058Java\u7b14\u8bd5\u65f6\u53ef\u80fd\u51fa\u73b0\u95ee\u9898>>\uff0c\u8fd8\u6709\u4e00\u7bc7\u5fd8\u4e86\u540d\u5b57\uff0c\u8bfb\u540e\u6df1\u53d7\u542f\u53d1\u3002
\n\u5728\u5bfb\u627e\u8fd9\u4e9b\u7b54\u6848\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6211\u5c06\u76f8\u5173\u7b54\u6848\u8bb0\u5f55\u4e0b\u6765\uff0c\u5c31\u5f62\u6210\u4e86\u4ee5\u4e0b\u8fd9\u4e9b\u4e1c\u897f\u3002\u9700\u8981\u8bf4\u660e\u7684\u662f\u4ee5\u4e0b\u7b54\u6848\u80af\u5b9a\u6709\u5f88\u591a\u4e0d\u5b8c\u6574\u751a\u81f3\u9519\u8bef\u7684\u5730\u65b9\uff0c\u9700\u8981\u5404\u4f4d\u6765\u66f4\u6b63\u4e0e\u5b8c\u5584\u5b83\uff0c\u5343\u4e07\u4e0d\u8981\u6254\u6211\u7684\u9e21\u86cb\u554a\u3002
\n\u5e0c\u671b\u672c\u6587\u80fd\u591f\u7ed9\u5373\u5c06\u5954\u8d74\u7b14\u8bd5\u8003\u573a\u7684\u540c\u4ec1\u4e9b\u8bb8\u5e2e\u52a9\uff0c\u66f4\u5e0c\u671b\u66f4\u591a\u7684\u4eba\u52a0\u5165\u5230\u6536\u96c6\u6574\u7406\u7b14\u8bd5\u9898\u4e0e\u5b8c\u5584\u7b54\u6848\u7684\u8fd9\u4e9b\u5de5\u4f5c\u4e2d\u6765\uff0c\u4e3a\u5927\u5bb6\u66f4\u597d\u7684\u83b7\u5f97\u5de5\u4f5c\u673a\u4f1a\u505a\u4e00\u70b9\u8d21\u732e\u3002
\n\u5728\u6b64\u611f\u8c22\u524d\u9762\u4e24\u6587\u7684\u4f5c\u8005\u7684\u5bf9\u7b14\u8bd5\u9898\u76ee\u7684\u6536\u96c6\u4e0e\u6574\u7406\u3002
\n\u5982\u6709\u4efb\u4f55\u610f\u89c1\u4e0e\u5efa\u8bae\u8bf7\u901a\u8fc7QQ:6045306,Mail:huijunzi@21cn.com\u4e0e\u6211\u8054\u7cfb\u3002
\nJava\u57fa\u7840\u65b9\u9762:<\/p>\n
1\u3001\u4f5c\u7528\u57dfpublic,private,protected,\u4ee5\u53ca\u4e0d\u5199\u65f6\u7684\u533a\u522b
\n\u7b54\uff1a\u533a\u522b\u5982\u4e0b\uff1a
\n\u4f5c\u7528\u57df \u5f53\u524d\u7c7b \u540c\u4e00package \u5b50\u5b59\u7c7b \u5176\u4ed6package
\npublic \u221a \u221a \u221a \u221a
\nprotected \u221a \u221a \u221a \u00d7
\nfriendly \u221a \u221a \u00d7 \u00d7
\nprivate \u221a \u00d7 \u00d7 \u00d7
\n\u4e0d\u5199\u65f6\u9ed8\u8ba4\u4e3afriendly<\/p>\n
2\u3001ArrayList\u548cVector\u7684\u533a\u522b,HashMap\u548cHashtable\u7684\u533a\u522b
\n\u7b54\uff1a\u5c31ArrayList\u4e0eVector\u4e3b\u8981\u4ece\u4e8c\u65b9\u9762\u6765\u8bf4.
\n\u4e00.\u540c\u6b65\u6027:Vector\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\u662f\u540c\u6b65\u7684\uff0c\u800cArrayList\u662f\u7ebf\u7a0b\u5e8f\u4e0d\u5b89\u5168\u7684\uff0c\u4e0d\u662f\u540c\u6b65\u7684
\n\u4e8c.\u6570\u636e\u589e\u957f:\u5f53\u9700\u8981\u589e\u957f\u65f6,Vector\u9ed8\u8ba4\u589e\u957f\u4e3a\u539f\u6765\u4e00\u57f9\uff0c\u800cArrayList\u5374\u662f\u539f\u6765\u7684\u4e00\u534a
\n\u5c31HashMap\u4e0eHashTable\u4e3b\u8981\u4ece\u4e09\u65b9\u9762\u6765\u8bf4\u3002
\n\u4e00.\u5386\u53f2\u539f\u56e0:Hashtable\u662f\u57fa\u4e8e\u9648\u65e7\u7684Dictionary\u7c7b\u7684\uff0cHashMap\u662fJava 1.2\u5f15\u8fdb\u7684Map\u63a5\u53e3\u7684\u4e00\u4e2a\u5b9e\u73b0
\n\u4e8c.\u540c\u6b65\u6027:Hashtable\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\u662f\u540c\u6b65\u7684\uff0c\u800cHashMap\u662f\u7ebf\u7a0b\u5e8f\u4e0d\u5b89\u5168\u7684\uff0c\u4e0d\u662f\u540c\u6b65\u7684
\n\u4e09.\u503c\uff1a\u53ea\u6709HashMap\u53ef\u4ee5\u8ba9\u4f60\u5c06\u7a7a\u503c\u4f5c\u4e3a\u4e00\u4e2a\u8868\u7684\u6761\u76ee\u7684key\u6216value<\/p>\n
3\u3001char\u578b\u53d8\u91cf\u4e2d\u80fd\u4e0d\u80fd\u5b58\u8d2e\u4e00\u4e2a\u4e2d\u6587\u6c49\u5b57?\u4e3a\u4ec0\u4e48?
\n\u7b54\uff1a\u662f\u80fd\u591f\u5b9a\u4e49\u6210\u4e3a\u4e00\u4e2a\u4e2d\u6587\u7684\uff0c\u56e0\u4e3ajava\u4e2d\u4ee5unicode\u7f16\u7801\uff0c\u4e00\u4e2achar\u536016\u4e2a\u5b57\u8282\uff0c\u6240\u4ee5\u653e\u4e00\u4e2a\u4e2d\u6587\u662f\u6ca1\u95ee\u9898\u7684<\/p>\n
4\u3001\u591a\u7ebf\u7a0b\u6709\u51e0\u79cd\u5b9e\u73b0\u65b9\u6cd5,\u90fd\u662f\u4ec0\u4e48?\u540c\u6b65\u6709\u51e0\u79cd\u5b9e\u73b0\u65b9\u6cd5,\u90fd\u662f\u4ec0\u4e48?
\n\u7b54\uff1a\u591a\u7ebf\u7a0b\u6709\u4e24\u79cd\u5b9e\u73b0\u65b9\u6cd5\uff0c\u5206\u522b\u662f\u7ee7\u627fThread\u7c7b\u4e0e\u5b9e\u73b0Runnable\u63a5\u53e3
\n\u540c\u6b65\u7684\u5b9e\u73b0\u65b9\u9762\u6709\u4e24\u79cd\uff0c\u5206\u522b\u662fsynchronized,wait\u4e0enotify<\/p>\n
5\u3001\u7ee7\u627f\u65f6\u5019\u7c7b\u7684\u6267\u884c\u987a\u5e8f\u95ee\u9898,\u4e00\u822c\u90fd\u662f\u9009\u62e9\u9898,\u95ee\u4f60\u5c06\u4f1a\u6253\u5370\u51fa\u4ec0\u4e48?
\n\u7b54:\u7236\u7c7b\uff1a
\npackage test;
\npublic class FatherClass
\n{
\npublic FatherClass()
\n{
\nSystem.out.println(“FatherClass Create”);
\n}
\n}
\n\u5b50\u7c7b:
\npackage test;
\nimport test.FatherClass;
\npublic class ChildClass extends FatherClass
\n{
\npublic ChildClass()
\n{
\nSystem.out.println(“ChildClass Create”);
\n}
\npublic static void main(String[] args)
\n{
\nFatherClass fc = new FatherClass();
\nChildClass cc = new ChildClass();
\n}
\n}
\n\u8f93\u51fa\u7ed3\u679c\uff1a
\nC:\\>java test.ChildClass
\nFatherClass Create
\nFatherClass Create
\nChildClass Create<\/p>\n
6\u3001\u5185\u90e8\u7c7b\u7684\u5b9e\u73b0\u65b9\u5f0f?
\n\u7b54\uff1a\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a
\npackage test;
\npublic class OuterClass
\n{
\nprivate class InterClass
\n{
\npublic InterClass()
\n{
\nSystem.out.println(“InterClass Create”);
\n}
\n}
\npublic OuterClass()
\n{
\nInterClass ic = new InterClass();
\nSystem.out.println(“OuterClass Create”);
\n}
\npublic static void main(String[] args)
\n{
\nOuterClass oc = new OuterClass();
\n}
\n}
\n\u8f93\u51fa\u7ed3\u679c:
\nC:\\>java test\/OuterClass
\nInterClass Create
\nOuterClass Create
\n\u518d\u4e00\u4e2a\u4f8b\u9898\uff1a
\npublic class OuterClass {
\nprivate double d1 = 1.0;
\n\/\/insert code here
\n}
\nYou need to insert an inner class declaration at line 3. Which two inner class declarations are<\/p>\n
valid?(Choose two.)
\nA. class InnerOne{
\npublic static double methoda() {return d1;}
\n}
\nB. public class InnerOne{
\nstatic double methoda() {return d1;}
\n}
\nC. private class InnerOne{
\ndouble methoda() {return d1;}
\n}
\nD. static class InnerOne{
\nprotected double methoda() {return d1;}
\n}
\nE. abstract class InnerOne{
\npublic abstract double methoda();
\n}
\n\u8bf4\u660e\u5982\u4e0b\uff1a
\n\u4e00.\u9759\u6001\u5185\u90e8\u7c7b\u53ef\u4ee5\u6709\u9759\u6001\u6210\u5458\uff0c\u800c\u975e\u9759\u6001\u5185\u90e8\u7c7b\u5219\u4e0d\u80fd\u6709\u9759\u6001\u6210\u5458\u3002 \u6545 A\u3001B \u9519
\n\u4e8c.\u9759\u6001\u5185\u90e8\u7c7b\u7684\u975e\u9759\u6001\u6210\u5458\u53ef\u4ee5\u8bbf\u95ee\u5916\u90e8\u7c7b\u7684\u9759\u6001\u53d8\u91cf\uff0c\u800c\u4e0d\u53ef\u8bbf\u95ee\u5916\u90e8\u7c7b\u7684\u975e\u9759\u6001\u53d8\u91cf\uff1breturn d1 \u51fa\u9519\u3002<\/p>\n
\u6545 D \u9519
\n\u4e09.\u975e\u9759\u6001\u5185\u90e8\u7c7b\u7684\u975e\u9759\u6001\u6210\u5458\u53ef\u4ee5\u8bbf\u95ee\u5916\u90e8\u7c7b\u7684\u975e\u9759\u6001\u53d8\u91cf\u3002 \u6545 C \u6b63\u786e
\n\u56db.\u7b54\u6848\u4e3aC\u3001E<\/p>\n
7\u3001\u5783\u573e\u56de\u6536\u673a\u5236,\u5982\u4f55\u4f18\u5316\u7a0b\u5e8f?
\n\u5e0c\u671b\u5927\u5bb6\u8865\u4e0a\uff0c\u8c22\u8c22<\/p>\n
8\u3001float\u578bfloat f=3.4\u662f\u5426\u6b63\u786e?
\n\u7b54:\u4e0d\u6b63\u786e\u3002\u7cbe\u5ea6\u4e0d\u51c6\u786e,\u5e94\u8be5\u7528\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\uff0c\u5982\u4e0b\u6240\u793a\uff1afloat f=(float)3.4<\/p>\n","protected":false},"excerpt":{"rendered":"
http:\/\/java.ccidnet.com\/art\/3759\/20060404\/496977_1.html \u524d\u6bb5\u65f6\u95f4\u56e0\u4e3a\u8981\u53c2\u52a0\u4e00\u4e2a\u7b14\u8bd5\uff0c\u5728\u51c6\u5907\u671f\u95f4\u5728\u7f51\u4e0a\u627e\u5230\u4e86\u4e24\u6761\u5173\u4e8e\u7b14\u8bd5\u9898\u76ee\u7684\u6587\u7ae0\uff0c\u5176\u4e2d\u4e00\u7bc7\u4e3a\uff0c\u8fd8… <\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[28],"tags":[],"class_list":["post-16","post","type-post","status-publish","format-standard","hentry","category-computer"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/opgogo.com\/blog2\/index.php?rest_route=\/wp\/v2\/posts\/16","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/opgogo.com\/blog2\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/opgogo.com\/blog2\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/opgogo.com\/blog2\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/opgogo.com\/blog2\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=16"}],"version-history":[{"count":0,"href":"https:\/\/opgogo.com\/blog2\/index.php?rest_route=\/wp\/v2\/posts\/16\/revisions"}],"wp:attachment":[{"href":"https:\/\/opgogo.com\/blog2\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=16"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/opgogo.com\/blog2\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=16"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/opgogo.com\/blog2\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=16"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}