\u4f01\u696d\u5185\u3067\u3042\u308c\u3070\u3001\u9577\u671f\u7684\u5c55\u671b\u3092\u3082\u3063\u3066\u3001\u6574\u5099\u3057\u3066\u3044\u304f\u3079\u304d<\/ul>\n\u8bb2\u89e3<\/p>\n\u53d8\u91cf\u548c\u5e38\u91cf<\/p>\n\u5e03\u5c14\u7c7b\u578b(Boolean)\u4e0d\u5e94\u8be5\u4f5c\u4e3a\u53c2\u6570\u4f7f\u7528\uff0c\u5e94\u8be5\u4f7f\u7528\u679a\u4e3e(enum)\u3002\u5f53\u5c06boolean\u7528\u4f5c\u65b9\u6cd5\u7684\u53c2\u6570\u65f6\uff0c\u5f88\u96be\u7406\u89e3\u3002
\n\u9700\u8981\u786e\u8ba4\u65b9\u6cd5\u7684\u89c4\u683c\u624d\u80fd\u7406\u89e3\u3002
\n\u5982\u679c\u4f7f\u7528enum\uff0c\u610f\u4e49\u5c31\u66f4\u52a0\u6e05\u6670\u4e86\u3002
\n\u5728\u65b9\u6cd5\u5185\u90e8\u8fdb\u884c\u5c40\u90e8\u4f7f\u7528\u6216\u4f5c\u4e3a\u65b9\u6cd5\u7684\u8fd4\u56de\u503c\uff0c\u6ca1\u6709\u4ec0\u4e48\u95ee\u9898\u3002<\/p>\n\u5728\u4e2d\u6587\u4e2d\u91cd\u65b0\u5b9a\u7fa9\u548c\u4f7f\u7528boolean(Boolean)\u3002
\nisActive\u7684\u5e03\u5c14\u503c\u4e3atrue\u3002<\/p>\n
\u4e0b\u8ff0\u7684\u6bd4\u4e0a\u8ff0\u7684\u66f4\u5bb9\u6613\u7406\u89e3\u3002<\/p>\n
boolean ACTIVE = true;
\nboolean IN_ACTIVE = false;
\nboolean status = IN_ACTIVE;<\/p>\n
\u5e03\u5c14\u7c7b\u578b ACTIVE = true;
\n\u5e03\u5c14\u7c7b\u578b IN_ACTIVE = false;
\n\u5e03\u5c14\u7c7b\u578b status = IN_ACTIVE;<\/p>\n
\u5982\u679c\u5c06\u5176\u4f5c\u4e3a\u65b9\u6cd5\u53c2\u6570\uff0c\u4e5f\u80fd\u7406\u89e3\u5176\u610f\u4e49\uff0c\u4f46\u5373\u4f7f\u4f20\u9012\u4e0d\u540c\u542b\u4e49\u7684boolean\uff0c\u4e5f\u4e0d\u4f1a\u7f16\u8bd1\u9519\u8bef\u3002\u5b9e\u9645\u4e0a\uff0c\u4f7f\u7528enum\u4f1a\u66f4\u597d\u3002<\/p>\n
boolean\uff08\u5e03\u5c14\uff09\u4e0d\u4f7f\u7528\u5426\u5b9a\u5f62\u5f0f\u7684\u540d\u79f0\u8fd9\u4e2a\u7406\u7531\u5f88\u96be\u7406\u89e3\uff0c\u5f53\u5728\u5426\u5b9a\u6761\u4ef6\u4e0b\u66f4\u96be\u7406\u89e3\uff0c\u518d\u52a0\u4e0a\u5176\u4ed6\u6761\u4ef6\u4e00\u8d77\u66f4\u96be\u7406\u89e3\u3002<\/p>\n
boolean notFound = true;
\nif (! notFound) {
\n\/\/ \u898b\u3064\u304b\u3063\u305f\u6642\u306e\u51e6\u7406.
\n}<\/p>\n
\u5e03\u5c14\u503c\u672a\u627e\u5230 = true;
\n\u5982\u679c (!\u5e03\u5c14\u503c\u672a\u627e\u5230) {
\n\/\/ \u88ab\u627e\u5230\u65f6\u7684\u5904\u7406.
\n}<\/p>\n
\u5c3d\u91cf\u907f\u514d\u4f7f\u7528String\u21d2\u6539\u4e3a\u4f7f\u7528\u5b57\u7b26\u4e32\u5305\u88c5\u7c7b\u7406\u7531\u662f\u56e0\u4e3a\u4ee5String\u7684\u5f62\u5f0f\u4e0d\u5bb9\u6613\u7406\u89e3\u3002
\n\u540d\u5b57\u662fString\uff0c\u4f4f\u5740\u662fString\uff0c\u516c\u53f8\u540d\u662fString\uff0c\u90e8\u95e8\u540d\u4e5f\u662fString\u90fd\u65e0\u6cd5\u4e86\u89e3\u3002
\n\u65e0\u8bba\u8fdb\u884c\u602a\u5f02\u7684\u8d4b\u503c\u8fd8\u662f\u4f20\u5165\u9519\u8bef\u7684\u53c2\u6570\u90fd\u4e0d\u4f1a\u5bfc\u81f4\u7f16\u8bd1\u9519\u8bef\u3002
\n\u5176\u5b9e\u6211\u5f88\u60f3\u5b9a\u4e49\u4e00\u4e2a\u7c7bCompanyName\u7ee7\u627fString\uff0c\u4f46\u662f\u4e0d\u53ef\u4ee5\uff0c\u56e0\u4e3aString\u662ffinal\u7c7b\u578b\u3002
\n\u56e0\u6b64\u6211\u4f1a\u5b9a\u4e49\u4e00\u4e2a\u7c7bCompanyName\uff0c\u5176\u4e2d\u5305\u542b\u4e00\u4e2a\u79c1\u6709String\u6210\u5458\u53d8\u91cf\u3002<\/p>\n
\u7136\u800c\uff0c\u5728\u4efb\u4f55\u60c5\u51b5\u4e0b\u90fd\u8981\u5c1d\u8bd5\u8fd9\u6837\u505a\u53ef\u80fd\u4f1a\u76f8\u5f53\u9ebb\u70e6\u3002
\n\u9700\u8981\u91cd\u65b0\u5b9a\u4e49String\u7c7b\u7684\u65b9\u6cd5\uff08\u53ea\u9700\u5fc5\u8981\u7684\u90e8\u5206\uff09\u3002
\n\u5728\u4f7f\u7528\u5916\u90e8\u5e93\u65f6\uff0c\u603b\u662f\u9700\u8981\u8fdb\u884c\u8f6c\u6362\u548c\u9006\u8f6c\u6362\u3002<\/p>\n
\u56e0\u6b64\uff0c\u5c06\u5c01\u95ed\u5728\u81ea\u5df1\u7684\u7cfb\u7edf\u4e2d\u7684\u5185\u5bb9\u521b\u5efa\u4e3aString\u5185\u5305\u7c7b\u3002
\n\u5c06\u9700\u8981\u4e0e\u5916\u90e8\u5e93\u8fdb\u884c\u4f20\u9012\u7684\u5185\u5bb9\u575a\u6301\u4f7f\u7528String\u3002<\/p>\n
\u5c06null\u8fdb\u884c\u91cd\u65b0\u5b9a\u4e49\u5e76\u4f7f\u7528 \u21d2 \u7c7b\u540d+IS_NULL\u5f53\u5c06null\u8d4b\u503c\u6216\u4f20\u9012\u7ed9\u65b9\u6cd5\u65f6\uff0c\u5176\u542b\u4e49\u4e0d\u660e\u786e\uff0c\u5c24\u5176\u662f\u5728\u4f20\u9012\u7ed9\u65b9\u6cd5\u65f6\u3002<\/p>\n
\u5730\u5740\u7c7b\uff1a
\n\/\/ \u7701\u7565\u5904\u7406<\/p>\n
\u6211\u7684\u7c7b\uff1a
\npublic void \u65b9\u6cd5(\u5730\u5740 addr)\uff1a
\n\/\/ \u7701\u7565\u5904\u7406<\/p>\n
\u8fd9\u6837\u7684\u8bdd\uff0c\u4e0d\u6e05\u695a\u4f20\u9012\u4e86\u4ec0\u4e48\u6837\u7684null\u3002
\nMyClass myObj = new MyClass();
\nmyObj.method(null); \/\/ \u21d2 \u4e0d\u6e05\u695a\u529e\u6cd5<\/p>\n
\u5982\u679c\u6309\u7167\u4ee5\u4e0b\u65b9\u5f0f\u8fdb\u884c:
\nAddress Address_IS_NULL = (Address)null;
\nmyObj.method(Address_IS_NULL); \/\/ \u21d2 \u66f4\u5bb9\u6613\u7406\u89e3<\/p>\n
\u5982\u679c\u4ee5\u4ee5\u4e0b\u65b9\u5f0f\u8fdb\u884c\uff1a<\/p>\n
\u6ce8\uff1a\u5728\u5b9a\u4e49null\u65f6\uff0c\u6700\u597d\u662f\u5728\u7c7b\uff08\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\u662fAddress\u7c7b\uff09\u5185\u90e8\u8fdb\u884c\u5b9a\u4e49\u3002
\n\u5f15\u7528Address.IS_NULL\u3002
\n\u7136\u800c\uff0c\u5f53\u4e0d\u662f\u81ea\u5df1\u8d1f\u8d23\u65f6\uff0c\u53ef\u4ee5\u91c7\u7528\u4e0a\u8ff0\u7684\u65b9\u5f0f\u3002<\/p>\n
\u4e0d\u4f7f\u7528int\u5e38\u6570\uff0c\u800c\u662f\u4f7f\u7528enum\u3002\u5982\u679c\u4f7f\u7528 int\uff0c\u5373\u4f7f\u8d4b\u4e88\u4e86\u975e\u6cd5\u503c\u4e5f\u4e0d\u4f1a\u88ab\u68c0\u67e5\u3002\u4f46\u662f\u5728\u73b0\u6709\u7cfb\u7edf\u4e2d\u5982\u679c\u4f7f\u7528\u4e86 int \u5e38\u91cf\uff0c\u5219\u4f7f\u7528 int \u5e38\u91cf\u662f\u4e0d\u53ef\u907f\u514d\u7684\u3002<\/p>\n
\/\/ \u4f7f\u7528int\u5b9a\u4e49\u6027\u522b
\nfinal int GENDER_MALE = 1;
\nfinal int GENDER_FEMALE = 2;
\nint intGender = GENDER_MALE;
\nintGender = 100; \/\/ \u4e0d\u4f1a\u5bfc\u81f4\u7f16\u8bd1\u9519\u8bef<\/p>\n
\u7528\u679a\u4e3e\u6765\u8868\u793a\u53ef\u80fd\u6bd4\u4e0a\u8ff0\u65b9\u6cd5\u66f4\u597d\u3002
\nGender enumGender = Gender.MALE;<\/p>\n
\u4e3a\u4e86\u907f\u514d\u76f8\u7b49\u5224\u65ad\u7684Bug\uff0c\u4e0d\u8981\u4f7f\u7528int\u5e38\u91cf\u7b49\u540c\u4e8eInteger\u53d8\u91cf\u3002\u8fd9\u5c06\u88ab\u5224\u5b9a\u4e3a\u5047\u3002
\n\u5982\u679c\u51fa\u73b0\u9519\u8bef\uff0c\u5219\u65e0\u6cd5\u786e\u5b9a\u3002<\/p>\n\u4e0d\u8981\u4f7f\u7528\u8868\u793a\u79bb\u6563\u72b6\u6001\u7684\u5b57\u7b26\u4e32\u5e38\u91cf\u21d2\u4f7f\u7528\u679a\u4e3e\u5982\u679c\u6ca1\u6709\u4f7f\u7528int\u5e38\u91cf\uff0c\u90a3\u4e48\u8fd9\u4e5f\u548c\u4e0d\u4f7f\u7528\u5b83\u4e00\u6837\u3002\u65e0\u6548\u7684\u503c\u5c06\u4e0d\u4f1a\u88ab\u68c0\u67e5\u3002
\n\u4f46\u662f\u5982\u679c\u5728\u73b0\u6709\u7cfb\u7edf\u4e2d\u4f7f\u7528\u4e86String\u5e38\u91cf\uff0c\u90a3\u662f\u65e0\u53ef\u5948\u4f55\u7684\u3002<\/p>\n
\u6700\u540e\u4e00\u4e2a\u5b57\u7b26\u4e32\u53d8\u91cf\u4e0d\u4f1a\u5bfc\u81f4\u7f16\u8bd1\u9519\u8bef\u3002<\/p>\n
\u5c06\u4e0a\u8ff0\u5185\u5bb9\u6539\u4e3a\u679a\u4e3e\u7c7b\u578b\u3002
\n\u6027\u522b\u679a\u4e3e\u7c7b\u578b enumGender = Gender.FEMALE\u3002<\/p>\n
\u5982\u679c\u5728\u6570\u636e\u5e93\u4e0a\u662f\u4ee5\u6570\u5b57\u6216\u6587\u672c\u5f62\u5f0f\uff0c\u800c\u5728\u5185\u5b58\u4e2d\u662f\u679a\u4e3e\u7c7b\u578b\uff0c\u5219\u517c\u5bb9\u6027\u4e0d\u4f73\uff0c\u9700\u8981\u8fdb\u884c\u76f8\u4e92\u8f6c\u6362\u3002\u901a\u8fc7\u5728\u8be5\u679a\u4e3e\u7c7b\u578b\u4e2d\u5b9e\u73b0\u9759\u6001\u7684fromInt\uff08fromString\uff09\u65b9\u6cd5\u548ctoInt\uff08toString\uff09\u65b9\u6cd5\uff0c\u5c31\u80fd\u521b\u5efa\u4e00\u4e2a\u901a\u7528\u7c7b\u6765\u8fdb\u884c\u8f6c\u6362\u3002<\/p>\n
\u5982\u679c\u5728\u6267\u884c\u65f6\u4e0d\u53d1\u751f\u53d8\u5316\u7684\u4e8b\u9879\uff0c\u5e94\u8be5\u4f7f\u7528\u6570\u7ec4\u800c\u4e0d\u662f\u5217\u8868\u6765\u5b9a\u4e49\u3002\u800c\u9700\u8981\u5728\u903b\u8f91\u4e2d\u751f\u6210\u7684\u4e8b\u9879\uff0c\u5219\u5e94\u8be5\u4f7f\u7528\u5217\u8868\u800c\u4e0d\u662f\u6570\u7ec4\u3002\u5728\u51b3\u5b9a\u4f7f\u7528\u6570\u7ec4\u8fd8\u662f\u5217\u8868\u65f6\u53ef\u80fd\u4f1a\u611f\u5230\u56f0\u60d1\uff0c\u4f46\u8bbe\u5b9a\u8fd9\u6837\u7684\u539f\u5219\u4f1a\u5f88\u6709\u5e2e\u52a9\u3002<\/p>\n\u4e0d\u8981\u5bf9\u56fa\u5b9a\u6570\u8fdb\u884c\u786c\u7f16\u7801\u3002\u5982\u679c\u53ea\u5199\u4e0b\u4e00\u4e2a\u5e38\u6570\uff0c\u90a3\u5c31\u65e0\u6cd5\u7406\u89e3\u5176\u542b\u4e49\u3002
\n\u5728\u8fdb\u884c\u4fee\u6b63\u65f6\uff0c\u53ef\u80fd\u4f1a\u9519\u8bef\u5730\u4fee\u6b63\u5176\u4ed6\u90e8\u5206\u5904\u4e8e\u76f8\u540c\u503c\u7684\u5730\u65b9\u3002<\/p>\n
\/\/ \u5f53\u628astatus\u7684\u503c\u6539\u4e3a\u5176\u4ed6\u503c\u65f6\uff0c\u53ef\u80fd\u4f1a\u8bef\u6539gender\u7684\u503c\uff0c\u8fd9\u6837\u5c31\u65e0\u6cd5\u7406\u89e3\u5176\u610f\u4e49\u3002
\nint status = 1; \/\/ \u65e0\u6cd5\u7406\u89e3\u5176\u610f\u4e49
\nint gender = 1; \/\/ \u65e0\u6cd5\u7406\u89e3\u5176\u610f\u4e49<\/p>\n
\u5c06\u4ee5\u4e0b\u5185\u5bb9\u8fdb\u884c\u91cd\u8ff0\uff0c\u4ee5\u4f7f\u5176\u66f4\u6613\u7406\u89e3\uff0c\u4e14\u65e0\u9700\u8fdb\u884c\u66f4\u6539\u3002
\n\u72b6\u6001\u5e38\u91cfSTATUS_ACTIVE\u7684\u503c\u4e3a1\uff1b
\n\u72b6\u6001\u5e38\u91cfSTATUS_INACTIVE\u7684\u503c\u4e3a2\uff1b
\n\u6027\u522b\u5e38\u91cfGENDER_MALE\u7684\u503c\u4e3a1\uff1b
\n\u6027\u522b\u5e38\u91cfGENDER_FEMALE\u7684\u503c\u4e3a2\uff1b
\nstatus\u53d8\u91cf\u7684\u503c\u4e3aSTATUS_ACTIVE\uff0c\u5bb9\u6613\u7406\u89e3\uff1b
\ngender\u53d8\u91cf\u7684\u503c\u4e3aGENDER_MALE\uff0c\u5bb9\u6613\u7406\u89e3\u3002<\/p>\n
\u6ce8\u610f\uff0c\u5bf9\u4e8e\u8fd9\u4e2a\u4f8b\u5b50\u6765\u8bf4\uff0c\u6700\u597d\u6539\u6210\u679a\u4e3e\u5f62\u5f0f\u3002<\/p>\n
\u907f\u514d\u91cd\u590d\u4f7f\u7528\u53d8\u91cf\u4e00\u4e2a\u53d8\u91cf\u5e94\u8be5\u53ea\u7528\u4e8e\u4e00\u4e2a\u610f\u4e49\u3002<\/p>\n
\u867d\u7136\u6211\u77e5\u9053\u8fd9\u4e00\u70b9\uff0c\u4f46\u5728\u5fd9\u788c\u7684\u65f6\u5019\u8fd8\u662f\u53ef\u80fd\u51fa\u9519\uff0c\u6240\u4ee5\u8981\u6ce8\u610f\u3002<\/p>\n
\u5c3d\u91cf\u907f\u514d\u5bf9\u53d8\u91cf\u8fdb\u884c\u91cd\u65b0\u8d4b\u503c\u3002\u591a\u6b21\u5bf9\u53d8\u91cf\u8fdb\u884c\u8d4b\u503c\u65f6\uff0c\u5f53\u4f7f\u7528\u8be5\u53d8\u91cf\u8fdb\u884c\u5904\u7406\u65f6\uff0c\u5176\u503c\u4f1a\u53d8\u5f97\u96be\u4ee5\u7406\u89e3\u3002
\n\u4ec0\u4e48\u60c5\u51b5\u624d\u88ab\u89c6\u4e3a”\u518d\u8d4b\u503c”\u662f\u5fae\u5999\u7684\u3002
\n\u4f8b\u5982\u4ee5\u4e0b\u60c5\u51b5\u5e94\u8be5\u6ca1\u6709\u95ee\u9898\u3002
\n\u5728\u5faa\u73af\u4e2d\u9010\u4e2a\u5904\u7406\u5b9e\u4f8b\u65f6\uff0c\u5c06\u503c\u8d4b\u7ed9\u5b9e\u4f8b\u53d8\u91cf\u6216\u76f8\u5173\u53d8\u91cf\u3002
\n\u8bbe\u7f6e\u521d\u59cb\u503c\uff0c\u5728\u67d0\u4e9b\u6761\u4ef6\u4e0b\u66f4\u65b0\u8be5\u503c\uff0c\u7136\u540e\u4f7f\u7528\u8be5\u53d8\u91cf\u8fdb\u884c\u5904\u7406\u3002
\n\u4e0d\u597d\u7684\u60c5\u51b5\u7684\u793a\u4f8b\u3002
\n\u5728\u5bf9\u53d8\u91cf\u8d4b\u503c\u540e\u4f7f\u7528\u8be5\u53d8\u91cf\u8fdb\u884c\u5904\u7406\uff0c\u7136\u540e\u518d\u6b21\u5c06\u5176\u503c\u8d4b\u7ed9\u8be5\u53d8\u91cf\uff0c\u518d\u6b21\u4f7f\u7528\u8be5\u53d8\u91cf\u8fdb\u884c\u5904\u7406\u3002
\n\u53c2\u8003”\u5c06\u4e00\u7cfb\u5217\u7684\u5904\u7406\u653e\u5165\u4ee3\u7801\u5757\u4e2d”\u3002<\/p>\n\u5728\u4e2d\u6587\u4e2d\uff0c\u7c7b\u578b\u53c2\u6570\u5728\u524d\u9762\u52a0\u4e0a$\u7b26\u53f7\u3002\u4e3a\u4e86\u6e05\u6670\u5730\u8bf4\u660e\u610f\u56fe\u662f\u901a\u8fc7\u7c7b\u578b\u53c2\u6570\u5b9e\u73b0\u7684\uff0c
\n\u5982\u679c\u4e0a\u8ff0\u610f\u56fe\u80fd\u591f\u5b9e\u73b0\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u5176\u4ed6\u65b9\u6cd5\uff0c\u4f46\u6700\u597d\u4e0d\u8981\u8fdd\u53cd\u5176\u4ed6\u89c4\u5219\u7684\u8303\u56f4\u3002<\/p>\n\u5982\u679c\u4e0d\u9700\u8981\u4e3a\u53d8\u91cf\u8d77\u7279\u5b9a\u4e8e\u4e1a\u52a1\u7684\u540d\u79f0\uff0c\u53ef\u4ee5\u5c06\u53d8\u91cf\u547d\u540d\u4e3a\u80fd\u591f\u8054\u60f3\u5230\u5176\u7c7b\u578b\u7684\u540d\u79f0\u3002\u5982\u679c\u662fString\u7c7b\u578b\uff0c\u53ef\u4ee5\u4f7f\u7528str\u7b49\u7b49\u3002
\n\u7279\u522b\u662f\u5728\u5171\u4eab\u7c7b\u4e2d\uff0c\u8fd9\u6837\u505a\u4f1a\u66f4\u597d\u3002<\/p>\n\u7c7b\u5b9a\u4e49<\/p>\n\u5b9e\u4f8b\u7c7b\uff08\u6682\u79f0\u4e3a\u6570\u636e\u5b58\u653e\u7c7b\uff09\u5c06\u5b57\u6bb5\u6574\u7406\u5728\u5f00\u5934\uff0c\u5e76\u5c06\u5b57\u6bb5\u6ce8\u91ca\u653e\u5728\u4e00\u884c\u4e2d\u3002\u4e3a\u4e86\u5feb\u901f\u4e86\u89e3\u5b57\u6bb5\u5217\u8868\uff0c\u539f\u56e0\u662f\u5e0c\u671b\u5728\u67e5\u770b\u6e90\u4ee3\u7801\u65f6\uff0c\u53ef\u4ee5\u4e00\u773c\u770b\u5230\u5f00\u5934\u90e8\u5206\u4ee5\u4fbf\u5feb\u901f\u7406\u89e3\u6709\u54ea\u4e9b\u5b57\u6bb5\u3002\u56e0\u6b64\uff0c\u53ea\u9700\u5728\u5f00\u5934\u90e8\u5206\u5b9a\u4e49\u5b57\u6bb5\u5e76\u5c06\u5b57\u6bb5\u6ce8\u91ca\u5199\u5165\u4e00\u884c\u800c\u4e0d\u6362\u884c\u3002<\/p>\n\u903b\u8f91\u7c7b\uff08\u6682\u5b9a\u540d\u79f0\uff1a\u903b\u8f91\u4e2d\u5fc3\u7c7b\uff09\u7684\u5b57\u6bb5\u5e94\u5728\u6700\u540e\u8fdb\u884c\u8bb0\u5f55\u3002\u5728\u903b\u8f91\u7c7b\u4e2d\uff0c\u6211\u4eec\u60f3\u8981\u4e86\u89e3\u516c\u5f00\u7684\u65b9\u6cd5\u3002
\n\u4f5c\u4e3a\u4f7f\u7528\u7c7b\u7684\u7acb\u573a\uff0c\u6211\u4eec\u5e76\u4e0d\u9700\u8981\u4e86\u89e3\u5185\u90e8\u5904\u7406\u4f7f\u7528\u7684\u5b57\u6bb5\uff0c\u56e0\u6b64\u5e94\u8be5\u5728\u6700\u540e\u8fdb\u884c\u63cf\u8ff0\u3002
\n\u516c\u5f00\u7684\u53d8\u91cf\u548c\u5e38\u91cf\u5e94\u8be5\u5728\u5f00\u5934\u8fdb\u884c\u63cf\u8ff0\uff0c\u4f46\u79c1\u6709\u7684\u5e38\u91cf\u6700\u597d\u5728\u6700\u540e\u8fdb\u884c\u63cf\u8ff0\u3002<\/p>\n\u53ea\u5728\u9700\u8981\u7684\u65f6\u5019\u7ed9\u7c7b\u52a0\u4e0apublic\u3002\u660e\u663e\u5728\u81ea\u5df1\u7684\u5305\u5916\u88ab\u5f15\u7528\u7684\u4e1c\u897f\u5e94\u8be5\u8bbe\u4e3apublic\u3002
\n\u5176\u4ed6\u7684\u7c7b\u4e0d\u5e94\u8be5\uff08\u6682\u65f6\uff09\u8bbe\u4e3apublic\u3002
\n\u5982\u679c\u9700\u8981\u7684\u8bdd\uff0c\u53ef\u4ee5\u5728\u90a3\u4e2a\u65f6\u5019\u8bbe\u4e3apublic\uff0c\u4f46\u8fd9\u65f6\u5019\u4f1a\u51fa\u73b0\u201c\u8fd9\u4e2a\u5e94\u8be5\u8bbe\u4e3apublic\u5417\uff1f\u201d\u7684\u601d\u8003\u65f6\u673a\u3002
\n\u95ee\u9898\u5728\u4e8e\uff0c\u5176\u4ed6\u5305\u7684\u8d23\u4efb\u4eba\u53ef\u80fd\u4f1a\u5728\u4e0d\u77e5\u9053\u53ef\u7528\u7684\u7c7b\u7684\u60c5\u51b5\u4e0b\u521b\u5efa\u7c7b\u4f3c\u7684\u7c7b\u3002<\/p>\n\u5728\u6784\u9020\u51fd\u6570\u4e2d\uff0c\u4ec5\u8fdb\u884c\u5b57\u6bb5\u521d\u59cb\u5316\uff0c\u800c\u4e0d\u6267\u884c\u5b9e\u8d28\u6027\u7684\u5904\u7406\u3002\u6216\u8bb8\u4e0d\u662f\u5fc5\u987b\u7684\uff0c\u4f46\u5e94\u8be5\u662f\u5e38\u8bc6\u3002
\n\u666e\u901a\u6784\u9020\u51fd\u6570\u901a\u5e38\u4e0d\u4f1a\u6dfb\u52a0\u592a\u591a\u5904\u7406\uff0c\u5982\u679c\u6dfb\u52a0\u4e86\u5176\u4ed6\u5904\u7406\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u4ed6\u4eba\u8bef\u89e3\u3002<\/p>\n\u5c06\u5b57\u6bb5\u521d\u59cb\u5316\u7684\u65b9\u6cd5\u8bbe\u4e3afinal\u3002\u9886\u57df\u4e0d\u5728\u58f0\u660e\u884c\u4e2d\u521d\u59cb\u5316\uff0c\u800c\u662f\u5728\u521d\u59cb\u5316\u65b9\u6cd5\u4e2d\u8fdb\u884c\u3002
\n\u8fd9\u6837\u80fd\u66f4\u6e05\u695a\u5730\u77e5\u9053\u6b63\u5728\u521d\u59cb\u5316\u4ec0\u4e48\u3002
\n\u5f53\u9700\u8981\u91cd\u65b0\u521d\u59cb\u5316\u65f6\u5f88\u65b9\u4fbf\u3002
\n\u5c06\u5176\u8bbe\u7f6e\u4e3afinal\u662f\u4e3a\u4e86\u9632\u6b62\u91cd\u5199\u3002\u5728\u6784\u9020\u51fd\u6570\u4e2d\u8c03\u7528\u7684\u65b9\u6cd5\u88ab\u91cd\u5199\u4f1a\u51fa\u95ee\u9898\u3002\u8be6\u7ec6\u7701\u7565\u3002
\n\u6ce8\u610f\uff0c\u9700\u8981\u53e6\u5916\u8003\u8651\u7ee7\u627f\u7c7b\u7684\u521d\u59cb\u5316\u65b9\u6cd5\u7684\u540d\u79f0\u3002<\/p>\n\u5728\u7cfb\u7edf\u4e2d\u7edf\u4e00\u547d\u540d\u5b57\u6bb5\u7684\u521d\u59cb\u5316\u65b9\u6cd5\uff08\u4f8b\u5982init\u7b49\uff09\u4e3a\u4e86\u907f\u514d\u8bef\u89e3\uff0c\u5f53\u7136\u8981\u907f\u514d\u7ed9\u5176\u4ed6\u76ee\u7684\u7684\u65b9\u6cd5\u8d77\u4e0e\u521d\u59cb\u5316\u65b9\u6cd5\u76f8\u540c\u7684\u540d\u5b57\u3002<\/p>\n\u5f53\u5728\u6784\u9020\u51fd\u6570\u6216\u65b9\u6cd5\u4e2d\u6ca1\u6709\u5904\u7406\u65f6\uff0c\u53ef\u4ee5\u5199\u4e0a”\u65e0\u64cd\u4f5c”\u3002\u6784\u9020\u51fd\u6570
\n\u5f53\u6ca1\u6709\u5904\u7406\u65f6\uff0c\u660e\u786e\u8868\u793a\u8fd9\u4e00\u70b9\u662f\u6b63\u786e\u7684\u3002
\n\u7136\u800c\uff0c\u5982\u679c\u5b57\u6bb5\u7684\u521d\u59cb\u5316\u5df2\u88ab\u65b9\u6cd5\u5316\uff0c\u90a3\u4e48\u5e94\u8be5\u6709\u4e00\u4e9b\u5904\u7406\u3002
\n\u7ee7\u627f\u7684\u7c7b\u7684\u6784\u9020\u51fd\u6570\u53ef\u80fd\u6ca1\u6709\u5904\u7406\u3002
\n\u53ef\u4ee5\u770b\u51fa\uff0c\u201c\u5728\u8003\u8651\u662f\u5426\u9700\u8981\u5904\u7406\u4e4b\u540e\uff0c\u5224\u65ad\u662f\u4e0d\u9700\u8981\u5904\u7406\u7684\u201d\u3002<\/p>\n
\u65b9\u6cd5
\n\u53ef\u80fd\u5b58\u5728\u6ca1\u6709\u5904\u7406\u7684\u65b9\u6cd5\u5417\uff1f\u21d2\u5728\u91cd\u5199\u65b9\u6cd5\u7684\u60c5\u51b5\u4e0b\u662f\u53ef\u80fd\u5b58\u5728\u7684\u3002
\n\u5c06\u5176\u6807\u6ce8\u4e3a\u201c\u6ca1\u6709\u5904\u7406\u201d\u21d2\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5c06\u5176\u63cf\u8ff0\u51fa\u6765\u662f\u5f88\u91cd\u8981\u7684\u3002
\n\u53ef\u4ee5\u77e5\u9053\u662f\u5728\u8003\u8651\u4e86\u662f\u5426\u9700\u8981\u5904\u7406\u4e4b\u540e\uff0c\u5224\u65ad\u4e0d\u9700\u8981\u5904\u7406\u3002<\/p>\n
\u521b\u5efa\u4e00\u4e2aComparator\u7684\u5b9e\u4f8b\u7c7b\u3002\u867d\u7136\u5f88\u591a\u60c5\u51b5\u4e0b\u5e76\u4e0d\u9700\u8981\uff0c\u4f46\u603b\u4e4b\u8fd8\u662f\u539f\u5219\u4e0a”\u8fdb\u884c\u521b\u5efa”\u3002
\n\u5982\u679c\u4e2a\u522b\u5224\u65ad\u8ba4\u4e3a”\u5728\u8fd9\u4e2a\u7c7b\u4e2d\u662f\u4e0d\u5fc5\u8981\u7684”\uff0c\u4e5f\u53ef\u4ee5\u3002<\/p>\n\u5728\u591a\u4e2a\u903b\u8f91\u7c7b\u4e2d\u4f7f\u7528\u7684\u5b9e\u4f8b\u7c7b\u4e5f\u53ef\u4ee5\u8003\u8651\u5c06\u63a5\u53e3\u5206\u79bb\u3002\u8003\u8651\u5c06\u64cd\u4f5c\u903b\u8f91\u7c7b\u901a\u8fc7\u63a5\u53e3\u4f20\u9012\u7ed9\u5176\u4ed6\u7c7b\u3002
\n\u4e0d\u8ba9\u4f20\u9012\u7684\u7c7b\u505a\u4efb\u4f55\u81ea\u4e3b\u51b3\u7b56\u3002
\n\u660e\u786e\u4f20\u9012\u7684\u7c7b\u5e94\u8be5\u505a\u4e9b\u4ec0\u4e48\u3002
\n\u4e3a\u4e86\u8fd9\u4e2a\u76ee\u7684\uff0c\u521b\u5efa\u4e00\u4e2a\u63a5\u53e3\u53ef\u80fd\u662f\u4e00\u4e2a\u597d\u9009\u62e9\u3002<\/p>\n\u4e0d\u8981\u521b\u5efa\u53ea\u5305\u542b\u5e38\u91cf\u7684\u63a5\u53e3\u21d2\u6539\u4e3a\u7c7b\u21d2\u4e0d\u53ef\u77e5\u662f\u5426implements\u539f\u56e0\u5982\u4e0a\u6240\u8ff0\u3002\u5982\u679c\u662f\u5728\u7c7b\u4e2d\uff0c\u5219\u5199\u51fa\u7c7b\u540d\u79f0\uff0c\u8fd9\u6837\u53ef\u4ee5\u6e05\u695a\u5730\u4e86\u89e3\u662f\u54ea\u4e2a\u5e38\u91cf\uff0c\u4ee5\u53ca\u5728\u54ea\u91cc\u5b9a\u4e49\u3002<\/p>\n\u5982\u679c\u5728\u9759\u6001\u4ee3\u7801\u5757\u4e2d\u4e0d\u5f97\u4e0d\u5f15\u53d1\u5f02\u5e38\u21d2\u8bb0\u5f55\u65e5\u5fd7\u548c\u629b\u51fa\u8fd0\u884c\u65f6\u5f02\u5e38\u3002\u8bf7\u6ce8\u610f\uff0c\u8fd9\u662f\u4e00\u4e2a\u76f8\u5f53\u7279\u6b8a\u7684\u60c5\u51b5\u3002
\n\u5728\u5171\u901a\u7c7b\u4e2d\u6709\u4e00\u4e2a\u9759\u6001\u5e38\u91cf\uff0c\u4f7f\u7528\u9759\u6001\u4ee3\u7801\u5757\u6765\u521d\u59cb\u5316\u5b83\u4f1a\u5f88\u65b9\u4fbf\u3002
\n\u56e0\u4e3a\u5b83\u4f1a\u5728\u7b2c\u4e00\u6b21\u4f7f\u7528\u65f6\u6267\u884c\uff0c\u6240\u4ee5\u4e0d\u9700\u8981\u8003\u8651\u6267\u884c\u65f6\u673a\u7684\u95ee\u9898\u3002
\n\u7136\u800c\uff0c\u9759\u6001\u4ee3\u7801\u5757\u4e0d\u80fd\u629b\u51fa\u5f02\u5e38\uff08\u4f1a\u5bfc\u81f4\u7f16\u8bd1\u9519\u8bef\uff09\u3002
\n\u5982\u679c\u5728\u9759\u6001\u4ee3\u7801\u5757\u4e2d\u786e\u5b9e\u5b58\u5728\u5f02\u5e38\uff0c\u53ef\u4ee5\u5728\u5185\u90e8\u8fdb\u884c\u6355\u83b7\uff0c\u7136\u540e\u8f93\u51fa\u65e5\u5fd7\u5e76\u629b\u51fa RuntimeException\uff0c\u8fd9\u6837\u5c31\u80fd\u901a\u8fc7\u7f16\u8bd1\u4e86\u3002<\/p>\n\u6839\u636e\u9700\u8981\uff0c\u5728\u7c7b\u5185\u521b\u5efa\u5c40\u90e8\u7c7b\u3002\u90a3\u4e9b\u5728\u5176\u4ed6\u5730\u65b9\u4e0d\u4f1a\u88ab\u4f7f\u7528\u7684\u8bfe\u7a0b\u5e94\u8be5\u5728\u672c\u5730\u5b9a\u4e49\u3002
\n\u5c06\u5176\u66b4\u9732\u5728\u5916\u4f1a\u8ba9\u4eba\u8ba8\u538c\uff0c\u5bb9\u6613\u5f15\u8d77\u8bef\u89e3\u3002
\n\u5c06\u53d8\u91cf\u5c3d\u53ef\u80fd\u5730\u9650\u5236\u5728\u4e00\u4e2a\u5c0f\u8303\u56f4\u5185\u540c\u6837\u9002\u7528\u3002<\/p>\n\u5b9e\u73b0\u548c\u7ee7\u627f<\/p>\n\u521b\u5efa\u4e00\u4e2a\u540d\u4e3a\u201cDummy\u201d\u7684\u865a\u62df\u5e93\u63a5\u53e3\uff08\u5982Comparator\u3001Iterator\u7b49\uff09\uff0c\u7136\u540e\u4f7f\u7528\u5b83\u3002\u539f\u56e0\u5728\u4e8e\uff0c\u901a\u8fc7JavaDoc\u53ef\u4ee5\u7acb\u5373\u4e86\u89e3Comparator\u7684\u5217\u8868\u3002<\/p>\n
\/\/ \u8fd9\u6837\u505a\u3002
\ninterface \u6211\u4eec\u7684\u6bd4\u8f83\u5668 extends Comparator {}
\nclass \u6211\u4eec\u7684\u7c7b implements \u6211\u4eec\u7684\u6bd4\u8f83\u5668 { …. }<\/p>\n
\u5728\u5b9e\u73b0\u548c\u7ee7\u627f\u4e2d\uff0c\u5c06\u539f\u59cb\u540d\u79f0\u524d\u52a0\u4e0a\u524d\u7f00\u7684\u540d\u79f0\u3002\u4ee5\u4e0b\u662f\u7406\u7531:
\n\u53ef\u4ee5\u7acb\u5373\u77e5\u9053\u540d\u5b57\u4ee3\u8868\u4ec0\u4e48\u5b9e\u73b0\u548c\u7ee7\u627f
\n\u5728Eclipse\u4e2d\u4f1a\u663e\u793a\u5728\u65c1\u8fb9\u3002<\/p>\n
\u4f8b\u5982\uff0c\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u65b9\u5f0f\u6765\u5b9e\u73b0\u3002
\n\/** \u5458\u5de5\u7c7b *\/
\nclass \u5458\u5de5 {}
\n\/* \u7ba1\u7406\u804c\u4f4d\u7c7b *\/
\nclass \u7ba1\u7406\u804c\u4f4d extends \u5458\u5de5 {}<\/p>\n
\u554f\u984c\u9ede
\n\u9019\u500b\u540d\u7a31\u5728\u82f1\u6587\u4e2d\u4e0d\u592a\u5408\u9069\u3002
\n\u7576\u5b58\u5728\u591a\u500b\u5be6\u73fe\u548c\u7e7c\u627f\u6642\uff0c\u9700\u8981\u9650\u5b9a\u4e00\u500b\u3002
\n\u5982\u679c\u5c64\u6b21\u8b8a\u6210\u591a\u500b\uff0c\u540d\u7a31\u5c07\u9010\u6f38\u8b8a\u9577\u3002<\/p>\n
\u5f53\u4e0d\u5e0c\u671b\u4f7f\u7528\u57fa\u7c7b\u65b9\u6cd5\u65f6\uff0c\u5c06\u5176\u8bbe\u4e3aRuntimeException\u3002\u521b\u5efa\u6d3e\u751f\u7c7b\u65f6\uff0c\u53ef\u80fd\u4f1a\u51fa\u73b0\u57fa\u7c7b\u65b9\u6cd5\u4e0d\u518d\u9700\u8981\u7684\u60c5\u51b5\u3002\u901a\u8fc7\u8986\u76d6\u8fd9\u4e2a\u65b9\u6cd5\u5e76\u5f15\u53d1RuntimeException\uff0c\u53ef\u4ee5\u9632\u6b62\u9519\u8bef\u7684\u8c03\u7528\u3002<\/p>\n\u5728\u7c7b\u5b9a\u4e49\u548c\u65b9\u6cd5\u4e2d\uff0c\u6839\u636e\u9700\u8981\uff0c\u53ef\u4ee5\u4f7f\u7528final\u5173\u952e\u5b57\u3002\u8fd9\u662f\u5e38\u8bc6\uff0c\u4f46\u4f3c\u4e4e\u5f88\u5c11\u6709\u4eba\u5b9e\u8df5\u3002\u6211\u4e5f\u662f\u8fd9\u6837\u3002
\n\u6240\u4ee5\u6700\u597d\u5c06\u5176\u5236\u5b9a\u4e3a\u89c4\u5219\uff0c\u4ee5\u514d\u5fd8\u8bb0\u3002<\/p>\n\u5b9e\u4f8b\u7c7b\u8981\u5b9e\u73b0toString\u65b9\u6cd5\u3002\u7531\u4e8e\u5bf9\u8c03\u8bd5\u7b49\u5de5\u4f5c\u975e\u5e38\u6709\u7528\uff0c\u6240\u4ee5\u4e00\u5b9a\u8981\u5b9e\u73b0\u3002
\n\u53ea\u9700\u5c06\u6240\u9700\u5b57\u6bb5toString\u5e76\u8fde\u63a5\u8d77\u6765\uff0c\u5c31\u80fd\u521b\u5efa\u901a\u7528\u7684\u8f85\u52a9\u5de5\u5177\u3002<\/p>\n\u5b9e\u4f8b\u7c7b\u9700\u8981\u5b9e\u73b0equals\u3001hashCode\u3001Comparable\u548cclone\u3002\u5728\u8fd9\u4e9b\u4e2d\u6709\u5f88\u591a\u662f\u4e0d\u5fc5\u8981\u7684\u3002
\n\u5c06\u5176\u89c4\u5b9a\u4e3a\u5b9e\u73b0\u7684\u89c4\u5219\uff0c\u7136\u540e\u9488\u5bf9\u201c\u8fd9\u4e2a\u7c7b\u4e0d\u9700\u8981\u5b9e\u73b0\u201d\u7684\u60c5\u51b5\u8fdb\u884c\u4e2a\u522b\u5224\u65ad\u3002<\/p>\n
## \u65b9\u6cd5<\/p>\n
\u5728\u65b9\u6cd5\u7684\u540d\u79f0\u4e2d\u4e0d\u4f7f\u7528\u5426\u5b9a\u5f62\u7279\u522b\u662f\u5bf9\u4e8e\u8fd4\u56de\u503c\u4e3a\u5e03\u5c14\u7c7b\u578b\u7684\u60c5\u51b5\u3002
\n\u4f7f\u7528\u4e0e\u5e03\u5c14\u53d8\u91cf\u540c\u540d\u7684\u53d8\u91cf\u540d\u53ef\u80fd\u4f1a\u8ba9\u4eba\u96be\u4ee5\u7406\u89e3\u3002
\n\u867d\u7136\u6709\u65f6\u5e76\u4e0d\u96be\u4ee5\u7406\u89e3\uff0c\u4f46\u4ecd\u9700\u8981\u4e2a\u522b\u5224\u65ad\u6765\u786e\u5b9a\u3002<\/p>\n\u8fd4\u56de\u503c\u4e3aList\u7b49\u65f6\uff0c\u82e5\u65e0\u503c\uff0c\u5219\u8fd4\u56denull\u6bd4\u8fd4\u56de\u7a7a\uff08\u5927\u5c0f\u4e3a\u96f6\uff09\u66f4\u4e3a\u5e38\u89c1\u3002
\n\u5982\u679c\u4e3a\u7a7a\uff0c\u53ef\u4ee5\u5c06\u6570\u636e\u53ef\u53d6\u4e0e\u6570\u636e\u4e0d\u53ef\u53d6\u65f6\u7684\u5904\u7406\u65b9\u5f0f\u76f8\u540c\u3002\u8fd9\u662f\u5b83\u7684\u4f18\u70b9\u3002<\/p>\n
\u7136\u800c\uff0c\u4e5f\u53ef\u4ee5\u8bf4\u9700\u8981\u660e\u786e\u5224\u65ad\u624d\u66f4\u597d\u3002
\n\u5173\u4e8e\u9009\u62e9\u54ea\u4e00\u4e2a\uff0c\u6211\u4eec\u53ef\u4ee5\u7edf\u4e00\u901a\u8fc7\u7cfb\u7edf\u6765\u51b3\u5b9a\u3002
\n\u8bf7\u53c2\u9605”\u5728\u539f\u6765\u7684\u7c7b\u4e2d\u521b\u5efa\u4e00\u4e2a\u5224\u65ad\u8fd4\u56de\u503c\u662f\u5426\u6b63\u5e38\u7684\u9759\u6001\u65b9\u6cd5”\u3002<\/p>\n
\u5728\u539f\u59cb\u7c7b\u4e2d\u521b\u5efa\u4e00\u4e2a\u9759\u6001\u65b9\u6cd5\u6765\u5224\u65ad\u8fd4\u56de\u503c\u662f\u5426\u6b63\u5e38\u3002\u5f53\u8fd4\u56de\u503c\u88ab\u8fd4\u56de\u540e\uff0c\u63a5\u4e0b\u6765\u7684\u5904\u7406\u5c06\u7531\u8c03\u7528\u65b9\u81ea\u884c\u51b3\u5b9a\u3002
\n\u65e0\u6cd5\u786e\u5b9a\u662f\u5426\u4f1a\u6309\u7167\u65b9\u6cd5\u7684\u672c\u610f\u8fdb\u884c\u89e3\u91ca\u3002<\/p>\n
\u4e3a\u4e86\u5c3d\u53ef\u80fd\u6539\u5584\uff0c\u8bf7\u6309\u4ee5\u4e0b\u65b9\u5f0f\u8fdb\u884c\uff1a
\n\u7c7b\u540d\u4e3aMyClass\u7684\u7c7b\uff1a
\n\/** \u8c03\u7528\u65b9\u6cd5 **\/
\npublic String method(String str) {
\n\/\/ \u5177\u4f53\u64cd\u4f5c
\nreturn null; \/\/ \u53d1\u751f\u9519\u8bef
\n}<\/p>\n
\/* \u5224\u65ad\u8fd4\u56de\u503c\u7684\u65b9\u6cd5 *\/
\npublic static boolean errorHappened(String value) {
\nreturn (value == null);
\n}<\/p>\n
MyClass myObj = new MyClass();
\nString returnValue = myObj.method(“aaaa”);
\nif (MyClass.errorHappened(returnValue)) {
\n\/\/ \u9519\u8bef\u5904\u7406
\n}<\/p>\n
\u6211\u77e5\u9053\u6709\u4eba\u6279\u8bc4\u8bf4\u300c\u8fc7\u706b\u300d\u3002<\/p>\n
\u628a\u8fd4\u56de\u503c\u4e3a\u5e03\u5c14\u7c7b\u578b\u7684\u65b9\u6cd5\u547d\u540d\u4e3a\u9002\u5e94if\u8bed\u53e5\u7684\u540d\u79f0\u3002\u7c7b MyClass {
\npublic boolean check(String str) {
\n\/\/ \u8fdb\u884c\u67d0\u4e9b\u64cd\u4f5c
\nreturn true;
\n}
\npublic boolean checkNormalEnded(String str) {
\n\/\/ \u8fdb\u884c\u67d0\u4e9b\u64cd\u4f5c
\nreturn true;
\n}
\n}<\/p>\n
MyClass myObj = new MyClass();
\n\/\/ \u8fd9\u6837\u7684\u8bdd\uff0c\u6211\u4e0d\u592a\u660e\u767d if \u8bed\u53e5\u7684\u610f\u601d
\nif (myObj.check(“aaaa”)) {
\n\/\/ \u8fdb\u884c\u67d0\u4e9b\u5904\u7406<\/p>\n
\u5982\u679c\u6211\u7684\u5bf9\u8c61\u68c0\u67e5\u6b63\u5e38\u7ed3\u675f\uff0c\u5e76\u4e14\u7406\u89e3\u4e86\u8fd9\u4e00\u70b9\uff0c
\nif (myObj.checkNormalEnded(“aaaa”)) {
\n\/\/ \u8fdb\u884c\u4e00\u4e9b\u5904\u7406
\n}<\/p>\n
\u5728\u8fd4\u56de\u503c\u4e2d\u4e0d\u8981\u4f7f\u7528\u5185\u90e8\u5bf9\u8c61\u7684List, Set, Map\u7b49\uff0c\u5982\u679c\u9700\u8981\u7684\u8bdd\uff0c\u5e94\u8fd4\u56de\u5176\u526f\u672c\u3002\u5982\u679c\u8fd4\u56de\u5185\u90e8\u7684List\u7b49\uff0c\u6709\u53ef\u80fd\u4f1a\u88ab\u4efb\u610f\u4fee\u6539\uff0c\u6240\u4ee5\u9009\u62e9\u590d\u5236\u5e76\u8fd4\u56de\u4e00\u4e2a\u526f\u672c\u3002\u987a\u4fbf\u63d0\u4e00\u4e0b\uff0cArrayList\u53ef\u4ee5\u514b\u9686\uff0c\u4f46\u662fList\u4e0d\u53ef\u4ee5\u514b\u9686\u3002<\/p>\n\u60f3\u8981\u8fd4\u56de\u591a\u4e2a\u503c\u65f6\u8be5\u600e\u4e48\u505a\uff1f\u21d2\u521b\u5efa\u4e00\u4e2a\u7c7b\u521b\u5efa\u4e00\u4e2a\u7528\u4e8e\u8fd4\u56de\u503c\u7684\u7c7b\u3002
\n\u4f46\u662f\u5982\u679c\u8fd9\u4e2a\u7c7b\u5728\u5176\u4ed6\u5730\u65b9\u65e0\u6cd5\u4f7f\u7528\uff0c\u90a3\u5c06\u975e\u5e38\u4ee4\u4eba\u61ca\u6094\u3002
\n\u4e0d\u8fc7\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u4f1a\u5fcd\u53d7\u61ca\u6094\uff0c\u5e76\u91c7\u53d6\u8fd9\u79cd\u505a\u6cd5\u3002<\/p>\n\u5f53\u60f3\u8981\u8fd4\u56de\u591a\u4e2a\u8fd4\u56de\u503c\u65f6\u5e94\u8be5\u600e\u4e48\u505a\uff1f\u2013 \u8fd4\u56de\u5bf9\u8c61\u6570\u7ec4 \u2013 \u521b\u5efa\u4e00\u4e2a\u7528\u4e8e\u63d0\u53d6\u503c\u7684\u9759\u6001\u65b9\u6cd5\u3002\/\/ \u5982\u679c\u4f60\u7edd\u5bf9\u4e0d\u559c\u6b22\u524d\u8ff0\u60c5\u51b5\uff0c\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u65b9\u5f0f\u8fdb\u884c\u64cd\u4f5c
\nclass Box {
\npublic Object[] getSize() {
\n\/\/ \u7b2c\u4e00\u4e2a\u5143\u7d20\u4ee3\u8868\u9ad8\u5ea6\uff0c\u7b2c\u4e8c\u4e2a\u5143\u7d20\u4ee3\u8868\u5bbd\u5ea6
\nreturn new Integer[]{5, 10};
\n}
\npublic static Integer getHeight(Object[] values) {
\nreturn (Integer)values[0];
\n}
\npublic static Integer getWidth(Object[] values) {
\nreturn (Integer)values[1];
\n}
\n}<\/p>\n
Box box = new Box();
\nObject[] values = box.getSize();
\nint width = Box.getWidth(values);
\nint height = Box.getHeight(values);<\/p>\n
\u7bb1\u5b50 box = new \u7bb1\u5b50();
\n\u7269\u4f53[] values = box.\u5927\u5c0f();
\nint \u5bbd\u5ea6 = \u7bb1\u5b50.\u5bbd\u5ea6(values);
\nint \u9ad8\u5ea6 = \u7bb1\u5b50.\u9ad8\u5ea6(values);<\/p>\n
\u4e0d\u9700\u8981\u7684\u5185\u90e8\u6570\u636e\u7684\u65b9\u6cd5\u5e94\u8be5\u8bbe\u4e3a\u9759\u6001\u3002\u4e0d\u9700\u8981\u8fdb\u884cnew\u64cd\u4f5c\uff0c\u53ea\u9700\u5199\u51fa\u7c7b\u540d\u5c31\u80fd\u6e05\u6670\u7406\u89e3\u5176\u610f\u601d\u3002
\n\u6211\u8ba4\u4e3a\u8fd9\u6837\u505a\u5f88\u5e38\u89c1\uff0c\u4f46\u6709\u65f6\u4f1a\u770b\u5230\u5c06\u5176\u8bbe\u4e3a\u5b9e\u4f8b\u65b9\u6cd5\u3002<\/p>\n\u5c3d\u91cf\u907f\u514d\u8fc7\u8f7d\uff0c\u4ee5\u4fbf\u4f7f\u4ee3\u7801\u66f4\u52a0\u6613\u61c2\u3002, sh\u01d0 y\u00ec .)<\/p>\n
\u5982\u679c\u68c0\u67e5\u53c2\u6570\u5c31\u80fd\u533a\u5206\uff0c\u4f46\u5f88\u9ebb\u70e6\uff0c\u5e94\u8be5\u901a\u8fc7\u65b9\u6cd5\u540d\u79f0\u8fdb\u884c\u533a\u5206<\/p>\n
\u903b\u8f91<\/p>\n\u5728\u7f16\u7a0b\u65f6\uff0c\u6ce8\u91cd\u6613\u7406\u89e3\u6027\u800c\u4e0d\u662f\u5904\u7406\u901f\u5ea6\u3002\u5982\u679c\u9700\u8981\u901f\u5ea6\uff0c\u5c31\u8fd9\u6837\u505a\u3002\u73b0\u5728\u8fd9\u4e00\u8ba4\u8bc6\u88ab\u89c6\u4e3a\u7406\u6240\u5f53\u7136\u3002<\/p>\n\u5982\u679c\u4f60\u89c9\u5f97\u903b\u8f91\u5f88\u201c\u96be\u3001\u590d\u6742\u201d\uff0c\u5c31\u8981\u91cd\u65b0\u601d\u8003\u4e00\u6b21\u3002 n\u01d0 “, “, .)\u8003\u8651\u4ee5\u4e0b\u4e8b\u9879\uff1a
\n\u6709\u6ca1\u6709\u66f4\u7b80\u5355\u7684\u903b\u8f91\uff1f
\n\u601d\u8003\u65b9\u5f0f\u662f\u5426\u6b63\u786e\uff1f
\n\u672c\u6765\u9700\u8981\u7684\u903b\u8f91\u5417\uff1f
\n\u5982\u679c\u4ecd\u7136\u9700\u8981\uff0c\u90a3\u5c31\u575a\u6301\u53bb\u505a\uff01<\/p>\n\u8fdb\u884c\u6574\u7406\u7684\u5904\u7406\u88ab\u5206\u7ec4\u4e3a\u4e00\u4e2a\u5757\u4e3a\u4e86\u5b9e\u73b0\u4e00\u4e2a\u64cd\u4f5c\uff0c\u6709\u65f6\u9700\u8981\u7f16\u5199\u591a\u884c\u4ee3\u7801\u3002\u4f8b\u5982\uff0c\u5c06\u503c\u8d4b\u7ed9\u4e00\u4e9b\u53d8\u91cf\u5e76\u8c03\u7528\u65b9\u6cd5\u7b49\u3002
\n\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u5c06\u8fd9\u4e9b\u4e00\u7cfb\u5217\u7684\u4ee3\u7801\u884c\u7ec4\u5408\u6210\u4e00\u4e2a\u4ee3\u7801\u5757\uff0c\u5e76\u5c06\u7f29\u8fdb\u51cf\u5c11\u4e00\u7ea7\u3002
\n\u901a\u8fc7\u5c06\u5176\u53d8\u4e3a\u4ee3\u7801\u5757\uff0c\u53ef\u4ee5\u770b\u51fa\u8fd9\u4e9b\u884c\u662f\u4e00\u7cfb\u5217\u76f8\u5173\u7684\u64cd\u4f5c\u3002
\n\u53ef\u4ee5\u7ed9\u6574\u4e2a\u4ee3\u7801\u5757\u6dfb\u52a0\u6ce8\u91ca\u3002
\n\u7531\u4e8e\u53ef\u4ee5\u5728\u4ee3\u7801\u5757\u5185\u90e8\u5b9a\u4e49\u53d8\u91cf\uff0c\u53ef\u4ee5\u9632\u6b62\u53d8\u91cf\u7684\u8bef\u64cd\u4f5c\u3002<\/p>\n
\u8fd9\u662f\u4e00\u4e2a\u5173\u4e8e\u6574\u4e2a\u4ee3\u7801\u5757\u7684\u6ce8\u91ca\uff0c\u5728\u4ee3\u7801\u5757\u5185\u90e8\u5199\u4e0b\u4e00\u7cfb\u5217\u7684\u64cd\u4f5c\uff1a
\n{
\nint a = 0;
\nString str = “abc”;
\n\/\/ \u63a5\u4e0b\u6765\u662f\u5176\u4ed6\u64cd\u4f5c.
\n}<\/p>\n
\u5728else\u8bed\u53e5\u4e2d\u8fdb\u884c\u6362\u884c\u3002\u5f88\u591a\u4eba\u4f1a\u50cf\u8fd9\u6837\u7f16\u5199if-else\u8bed\u53e5\uff1a
\nint a = 1;
\nif (a == 1) {
\n\/\/ \u9700\u8981\u6267\u884c\u7684\u64cd\u4f5c
\n} else {
\n\/\/ \u53e6\u4e00\u79cd\u64cd\u4f5c
\n}<\/p>\n
\u5c06\u5176\u63cf\u8ff0\u4e3a\u4e0b\u9762\u8fd9\u6837\u7684\u539f\u56e0\u662f\u53ef\u4ee5\u5728\u6574\u4e2aelse\u90e8\u5206\u6dfb\u52a0\u6ce8\u91ca\u3002\u8bf7\u53c2\u8003\u4e0a\u9762\u7684”\u5c06\u91cd\u590d\u7684\u5904\u7406\u653e\u5165\u5757\u4e2d”\u3002<\/p>\n
\u5982\u679c (a == 1) {
\n\/\/ \u9700\u8981\u6267\u884c\u7684\u64cd\u4f5c
\n}
\n\/\/ \u5982\u679c\u4e0d\u6ee1\u8db3\u6761\u4ef6\u65f6\u7684\u64cd\u4f5c\u21d2\u8fd9\u662felse\u7684\u6574\u4e2a\u6ce8\u91ca
\n\u5426\u5219 {
\n\/\/ \u53e6\u4e00\u79cd\u64cd\u4f5c
\n}<\/p>\n
\u4f7f\u7528\u4e09\u4e2a\u8fd0\u7b97\u7b26\u8fd9\u662f\u7406\u6240\u5f53\u7136\u7684\uff0c\u6211\u4eec\u7ecf\u5e38\u4f1a\u89c1\u5230\u672a\u4f7f\u7528\u7684\u7a0b\u5e8f\u3002\u884c\u6570\u589e\u591a\uff0c\u5197\u957f\uff0c\u96be\u4ee5\u9605\u8bfb\uff0c\u4ee4\u4eba\u70e6\u8e81\u3002\u4f46\u662f\u4e0d\u4f7f\u7528\u5d4c\u5957\u7684\u4e09\u5143\u8fd0\u7b97\u7b26\u3002<\/p>\n
\u5982\u679c\u6ca1\u6709else\u65f6\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u4e09\u5143\u8fd0\u7b97\u7b26\u6765\u51cf\u5c11\u4ee3\u7801\u884c\u6570\u3002\u4f8b\u5b50\uff1aa = (logic expression) ? a = (algebraic expression) : a;<\/p>\n
\u5982\u679cif\u8bed\u53e5\u7684\u5185\u5bb9\u53ea\u5305\u542b\u4e86break\u3001continue\u3001return\u3001throw\u8fd9\u4e9b\u5173\u952e\u5b57\uff0c\u90a3\u4e48\u53ef\u4ee5\u5c06\u5b83\u4eec\u4e0eif\u8bed\u53e5\u653e\u5728\u540c\u4e00\u884c\u4e0a\u8fdb\u884c\u7f16\u5199\u3002\u5982\u679c\uff08\u6761\u4ef6\uff09{ \u9000\u51fa\u5faa\u73af; }<\/p>\n
\u4e3a\u4e86\u51cf\u5c11\u884c\u6570\uff0c\u5c3d\u91cf\u5728\u5c4f\u5e55\u4e0a\u663e\u793a\u66f4\u591a\u5185\u5bb9\u7684\u539f\u56e0\u3002
\n\u5176\u4ed6\u60c5\u51b5\u4e0b\uff0c\u7531\u4e8e\u903b\u8f91\u4f1a\u6df7\u4e71\u5728\u4e0b\u65b9\u6d41\u52a8\uff0c\u6240\u4ee5\u88ab\u7981\u6b62\u3002<\/p>\n
\u5728\u4e2d\u6587\u4e2d\uff0c\u5224\u65adString\u7684\u76f8\u7b49\u6027\u53ef\u4ee5\u4f7f\u7528equals\u65b9\u6cd5\u3002\u6709\u65f6\u5019\u4f1a\u5076\u5c14\u770b\u5230\u4e00\u4e9b\u4ee5\u201c==\u201d\u8fdb\u884c\u5224\u65ad\u7684\u7a0b\u5e8f\u3002\u5982\u679c\u4ed4\u7ec6\u89c2\u5bdf\u5b83\u4eec\uff0c\u53ef\u80fd\u4f1a\u611f\u5230\u5934\u6655\u3002\u800c\u4e14\u6709\u65f6\u8fd9\u4e9b\u7a0b\u5e8f\u8fd8\u80fd\u901a\u8fc7\u6d4b\u8bd5\u3002\u80fd\u901a\u8fc7\u6d4b\u8bd5\u7684\u539f\u56e0\u662f\u56e0\u4e3a\u5b83\u4eec\u5faa\u73af\u590d\u5236\uff0c\u5e76\u4e14\u7ed3\u679c\u76f8\u7b49\u3002<\/p>\n\u5c06\u5b57\u7b26\u4e32\u7684\u7b49\u503c\u5224\u65ad\u4ee5\u5e38\u6570\u4f5c\u4e3a\u4e3b\u8bed\u3002\u4e3a\u4e86\u9632\u6b62\u51fa\u73b0null\u9519\u8bef\uff0c\u9700\u8981\u8fdb\u884c\u9002\u5f53\u7684null\u68c0\u67e5\u3002\u5f53\u786e\u5b9e\u9700\u8981\u8fdb\u884cnull\u68c0\u67e5\u65f6\uff0c\u9700\u8981\u5728\u524d\u4e00\u884c\u8fdb\u884c\u68c0\u67e5\u3002<\/p>\n
\u5b57\u7b26\u4e32 str = “bbbb”;
\nif (“aaaa”.equals((str))) { \/\/ \u6ce8\u610f\uff1a\u5b9e\u9645\u4e0a\u5e94\u5c06 “aaaa” \u5b9a\u4e49\u4e3a\u5e38\u91cf
\n\/\/ \u5339\u914d\u65f6\u7684\u5904\u7406
\n}<\/p>\n
\u5728\u4e2d\u6587\u4e2d\uff0c\u6709\u4e0d\u9700\u8981\u521b\u5efa\u5e03\u5c14\u503c\u5bf9\u8c61\u5728\u4e2d\u56fd\u7684\u539f\u751f\u8bed\u8a00\u4e2d\u8fdb\u884c\u6539\u5199\uff0c\u4ec5\u9700\u7ed9\u51fa\u4e00\u4e2a\u9009\u9879\uff1a
\nBoolean\u53ea\u80fd\u662ftrue\u3001false\uff08\u548cnull\uff09\uff0c\u5e76\u4e14\u7531Boolean\u7c7b\u5b9a\u4e49\uff0c\u4e0d\u9700\u8981\u8fdb\u884c\u5b9e\u4f8b\u5316\u3002
\n\u6ce8\u610f\uff0c(new Boolean(true)) == (new Boolean(true))\u4f1a\u8fd4\u56defalse.<\/p>\n
\u5e03\u5c14\u503c boolValue = \u5e03\u5c14\u503c.\u771f\u3002<\/p>\n
null\u9700\u8981\u660e\u786e\u7c7b\u578b\u5f53\u5c06\u5176\u8d4b\u503c\u7ed9\u53d8\u91cf\u65f6\uff0c\u5c3d\u7ba1\u8fd8\u597d\uff0c\u4f46\u5f53\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u65f6\u5bb9\u6613\u51fa\u9519\u3002
\n\u8fd9\u4f1a\u5f15\u53d1\u4e0d\u5b89\uff0c\u5e76\u9700\u8981\u67e5\u770b\u5bf9\u65b9\u7684\u65b9\u6cd5\u4ee5\u8fdb\u884c\u786e\u8ba4\u3002<\/p>\n
\u7c7bMyClass{
\npublic void method(String str){
\n\/\/ \u6267\u884c\u67d0\u4e9b\u64cd\u4f5c
\n}
\n}<\/p>\n
\u6211\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u5b9e\u73b0\uff1a
\nMyClass myObj = new MyClass();
\nmyObj.method((String)null);<\/p>\n
\u5b9e\u9645\u4e0a\uff0c\u6700\u597d\u91cd\u65b0\u5b9a\u4e49null\u3002\u8bf7\u53c2\u8003\u201c\u91cd\u65b0\u5b9a\u4e49null\u5e76\u4f7f\u7528\u21d2\u7c7b\u540d+IS_NULL\u201d\u3002<\/p>\n
\u5982\u679c\u3001\u5bf9\u4e8e\u3001\u5f53\u88ab\u89c6\u4f5c\u4e00\u4e2a\u5757\uff0c\u5373\u4f7f\u53ea\u6709\u4e00\u53e5\u8bdd\u4e5f\u662f\u5982\u6b64\u3002\u7406\u7531\u662f\u56e0\u4e3a\u5f53\u8bd5\u56fe\u6dfb\u52a0\u53e5\u5b50\u65f6\u4f1a\u51fa\u73b0\u9519\u8bef\u3002<\/p>\n\u5728\u9700\u8981\u8003\u8651\u987a\u5e8f\u7684\u5faa\u73af\u4e2d\uff0c\u4e0d\u4f7f\u7528\u589e\u5f3a\u578bfor\u5faa\u73af\u3002\u867d\u7136\u7ed3\u679c\u662f\u76f8\u540c\u7684\uff0c\u4f46\u5728\u6e90\u4ee3\u7801\u4e0a\u770b\u4e0d\u51fa\u662f\u6309\u987a\u5e8f\u8fdb\u884c\u5904\u7406\u3002<\/p>\n
\u5982\u679c\u9700\u8981\u5904\u7406\u987a\u5e8f\u53f7\uff0c\u4e0d\u4f7f\u7528\u589e\u5f3a\u578bfor\u5faa\u73af\u662f\u5f88\u81ea\u7136\u7684\u3002\u4f46\u662f\uff0c\u4f8b\u5982\u5728”\u6309\u8f93\u5165\u987a\u5e8f\u5904\u7406”\u7684\u60c5\u51b5\u4e0b\uff0c\u5373\u4f7f\u4e0d\u4f7f\u7528\u987a\u5e8f\u53f7\uff0c\u4e5f\u4e0d\u4f7f\u7528\u589e\u5f3a\u578bfor\u5faa\u73af\u3002<\/p>\n
\u8003\u8651\u4f7f\u7528\u5e38\u91cf\u8868\u6765\u5212\u5206\uff0c\u800c\u65e0\u9700\u4f7f\u7528\u5206\u652f(if,switch)\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528if\u8bed\u53e5\u7684\u4f8b\u5b50
\nint a = 1;
\nString msg;
\nif (a == 0) {
\nmsg = “aaaa”;
\n}
\nelse if (a == 1) {
\nmsg = “bbbb”;
\n}
\n\/\/\u7ee7\u7eed\u8fdb\u884c\u4e0b\u53bb\u3002<\/p>\n
\u7528\u4ee5\u4e0b\u65b9\u5f0f\u8fdb\u884c\uff1a
\nString[] msgs = new String[] {“aaaa”,”bbbb”};
\nmsg = msgs[a];<\/p>\n
\u8fd9\u4e2a\u4f8b\u5b50\u6ca1\u6709\u4ef7\u503c\uff0c\u4f46\u662f\u5728\u5236\u4f5c\u72b6\u6001\u673a\u7b49\u65f6\uff0c\u5982\u679c\u4e0d\u8fd9\u6837\u505a\u5c31\u4f1a\u6df7\u4e71\u3002\u4f46\u8bf7\u6ce8\u610f\uff0c\u5982\u679c\u539f\u59cb\u503c\u4e0d\u662f\u4ece\u96f6\u5f00\u59cb\uff0c\u5c31\u9700\u8981\u5c06\u6570\u7ec4\u8bbe\u4e3a\u4e24\u5c42\u3002\u53ea\u6709\u5e38\u91cf\u8868\uff0c\u6240\u4ee5\u5b83\u4f1a\u53d8\u5f97\u66f4\u77ed\u3001\u66f4\u6613\u8bfb\u21d2\u9519\u8bef\u4f1a\u53d8\u5c11\u3002<\/p>\n
\u5728else\u6761\u4ef6\u4e0b\u6ca1\u6709\u5904\u7406\u65f6\uff0c\u6ce8\u91ca\u4e3a”\u65e0\u5904\u7406”\u3002int a = 0;
\nif (a == 0) {
\n\/\/ \u5199\u5165\u67d0\u4e9b\u5904\u7406
\n}
\nelse {
\n\/\/ \u4e0d\u8fdb\u884c\u5904\u7406
\n}<\/p>\n
\u5f53\u7136\u5730\uff0c\u5bf9\u4e8e\u6240\u6709\u7684if\u8bed\u53e5\uff0c\u4e0d\u4e00\u5b9a\u8981\u8fd9\u6837\u505a\uff0c\u53ea\u6709\u5f53\u6709\u7591\u95ee\u7684\u7a7a\u95f4\u65f6\u624d\u9700\u8981\u3002
\n\u8fd9\u53ef\u4ee5\u4f20\u8fbe\u51fa\u201c\u5728\u8003\u8651\u662f\u5426\u9700\u8981else\u5904\u7406\u540e\uff0c\u5224\u65ad\u5b83\u662f\u4e0d\u5fc5\u8981\u7684\u201d\u7684\u610f\u601d\u3002<\/p>\n
\u5c06\u590d\u5408\u6761\u4ef6\u5206\u89e3\u5e76\u5d4c\u5957\u5728if\u8bed\u53e5\u4e2d\u3002\u5728\u4f7f\u7528if\u8bed\u53e5\u65f6\uff0c\u6709\u65f6\u4f1a\u51fa\u73b0\u591a\u4e2a\u6761\u4ef6\u901a\u8fc7”and”\u8fde\u63a5\u800c\u53d8\u5f97\u96be\u4ee5\u7406\u89e3\u7684\u60c5\u51b5\u3002\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5e94\u5f53\u89e3\u6790\u6761\u4ef6\u5e76\u5c06if\u8bed\u53e5\u8fdb\u884c\u5d4c\u5957\u3002<\/p>\n
\u5373\u4f7f\u53d7\u5230”\u7d20\u4eba”\u7684\u6279\u8bc4\uff0c\u4e5f\u4e0d\u80fd\u52a8\u6447\u3002\u91cd\u8981\u7684\u662f\u907f\u514dbug\uff0c\u5e76\u4e14\u6ce8\u91cd\u4f7f\u4ee3\u7801\u66f4\u6613\u7406\u89e3\u3002<\/p>\n
\u5c06\u590d\u5408\u6761\u4ef6\u7528\u62ec\u53f7\u5206\u9694\u5e76\u660e\u786e\u8868\u793a\u3002\u5f53\u591a\u4e2a\u6761\u4ef6\u901a\u8fc7and\/or\u8fde\u63a5\u5728\u4e00\u8d77\u65f6\uff0c\u5982\u679c\u7528\u62ec\u53f7()\u5c06\u5b83\u4eec\u5206\u9694\u5f00\u6765\uff0c\u4f1a\u66f4\u5bb9\u6613\u9605\u8bfb\u3002<\/p>\n\u5c3d\u91cf\u91cd\u590d\u4f7f\u7528\u5bf9\u8c61\u7531\u4e8e\u521b\u5efa\u5bf9\u8c61\u7684\u6210\u672c\u5f88\u9ad8\uff0c\u5982\u679c\u91cd\u65b0\u4f7f\u7528\uff0c\u53ef\u80fd\u4f1a\u51fa\u9519\u3002\u4e0d\u7528\u62c5\u5fc3\uff0c\u6700\u597d\u8fd8\u662f\u521b\u5efa\u65b0\u5bf9\u8c61\u3002\u5f53\u7136\uff0c\u5728\u9700\u8981\u8003\u8651\u6027\u80fd\u7684\u60c5\u51b5\u4e0b\u53ef\u4ee5\u8fdb\u884c\u91cd\u7528\u3002<\/p>\n\u5728\u8c03\u7528\u9759\u6001\u65b9\u6cd5\u65f6\uff0c\u5fc5\u987b\u4f7f\u7528\u7c7b\u540d\u800c\u4e0d\u662f\u53d8\u91cf\u540d\u3002\u5373\u4f7f\u5728\u81ea\u5df1\u7684\u7c7b\u4e2d\uff0c\u4e5f\u8981\u5199\u4e0a\u7c7b\u540d\u3002\u8c03\u7528\u9759\u6001\u65b9\u6cd5\u7684\u884c\u4e3a\u66f4\u52a0\u660e\u786e\uff0c\u4f7f\u5f97\u6e90\u4ee3\u7801\u66f4\u6613\u4e8e\u9605\u8bfb\u3002<\/p>\n\u5c3d\u91cf\u4e0d\u8981\u4f7f\u7528StringBuilder\uff08StringBuffer\uff09\u3002\u5c3d\u7ba1\u8fd9\u53ef\u80fd\u4f1a\u53d7\u5230\u6279\u8bc4\uff0c\u4f46\u6e90\u4ee3\u7801\u7684\u6613\u8bfb\u6027\u66f4\u91cd\u8981\u3002
\n\u786e\u5b9e\uff0c\u6027\u80fd\u4f1a\u6709\u6240\u4e0d\u540c\u3002\u7136\u800c\uff0c\u5728\u8bb8\u591a\u60c5\u51b5\u4e0b\uff0c\u7edd\u5bf9\u65f6\u95f4\u672c\u6765\u5c31\u5f88\u5c11\u3002
\n\u9664\u975e\u8fdb\u884c\u975e\u5e38\u591a\u7684\u5faa\u73af\u7b49\u64cd\u4f5c\u65f6\uff0c\u4e0d\u5efa\u8bae\u4f7f\u7528StringBuilder\u3002
\n\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0c\u5728\u6211\u7684\u6d4b\u8bd5\u4e2d\uff0c\u5f53\u4e0d\u4f7f\u7528StringBuilder\uff08\u6216StringBuffer\uff09\u8fdb\u884c\u5b57\u7b26\u4e32\u62fc\u63a5\u65f6\uff0c\u6240\u9700\u65f6\u95f4\u5927\u7ea6\u662f\u5b83\u768410\u500d\u3002<\/p>\n\u4e3a\u4e86\u65b9\u4fbf\u8fdb\u884c\u5355\u5143\u6d4b\u8bd5\uff0c\u5c06\u5185\u5b58\u4e2d\u7684\u903b\u8f91\u8f6c\u79fb\u5230\u65b9\u6cd5\u4e2d\u3002\u8fd9\u4e5f\u662f\u60c5\u5883\u5224\u65ad\u7684\u4e00\u90e8\u5206\uff0c\u4e00\u5b9a\u7a0b\u5ea6\u653e\u5bbd\u5916\u51fa\u662f\u597d\u7684\u3002\u7136\u800c\uff0c\u5982\u679c\u505a\u5f97\u8fc7\u591a\uff0c\u65b9\u6cd5\u7684\u6570\u91cf\u5c31\u4f1a\u53d8\u591a\uff0c\u4f1a\u5f15\u8d77\u6df7\u4e71\u3002<\/p>\n\u5411List\u3001Set\u3001Map\u7b49\u5bf9\u8c61\u6dfb\u52a0\u5b50\u5bf9\u8c61\u65f6\uff0c\u5e94\u5728\u521b\u5efa\u5b50\u5bf9\u8c61\u4e4b\u540e\u7acb\u5373\u8fdb\u884c\u6dfb\u52a0\u3002\u4e3a\u4e86\u9632\u6b62\u5728\u65b0\u589e\u540e\u5fd8\u8bb0\u6dfb\u52a0\u5904\u7406\u7a0b\u5e8f\u8fd9\u79cd\u60c5\u51b5\uff0c\u9700\u8981\u5f62\u6210\u4e00\u4e2a\u4e60\u60ef\uff0c\u4ee5\u514d\u5fd8\u8bb0\u3002\u8fd9\u5c06\u6709\u52a9\u4e8e\u9632\u6b62\u51fa\u73b0\u96be\u4ee5\u7406\u89e3\u7684\u9519\u8bef\uff08\u6709\u65f6\uff09\u3002<\/p>\n
\u5f53\u5b58\u5728\u4e0a\u8ff0\u4f8b\u5916\u65f6\uff0c\u662f\u5728\u8bbe\u7f6e\u65b0\u521b\u5efa\u5bf9\u8c61\u7684\u503c\uff0c\u5e76\u4e14\u5728\u7279\u5b9a\u6761\u4ef6\u4e0b\u53ef\u80fd\u4e0d\u8fdb\u884c\u6dfb\u52a0\u3002<\/p>\n
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