{"id":846,"date":"2022-12-08T02:45:20","date_gmt":"2022-12-15T22:58:25","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/java%e5%ad%97%e7%ac%a6%e4%b8%b2%e6%b5%8b%e9%aa%8c\/"},"modified":"2025-08-03T12:33:55","modified_gmt":"2025-08-03T04:33:55","slug":"java%e5%ad%97%e7%ac%a6%e4%b8%b2%e6%b5%8b%e9%aa%8c","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e5%ad%97%e7%ac%a6%e4%b8%b2%e6%b5%8b%e9%aa%8c\/","title":{"rendered":"Java\u5b57\u7b26\u4e32\u5168\u9762\u6d4b\u9a8c\uff1a\u6d4b\u8bd5\u4f60\u7684\u7f16\u7a0b\u6280\u80fd\u4e0e\u77e5\u8bc6\u638c\u63e1\u7a0b\u5ea6"},"content":{"rendered":"

\u6b22\u8fce\u53c2\u52a0Java\u5b57\u7b26\u4e32\u6d4b\u9a8c\u3002\u5b57\u7b26\u4e32\u662fJava\u4e2d\u6700\u91cd\u8981\u7684\u7c7b\u4e4b\u4e00\u3002\u5982\u679c\u4f60\u6709\u5728Java\u4e2d\u505a\u8fc7\u4efb\u4f55\u7f16\u7a0b\uff0c\u4f60\u80af\u5b9a\u4f1a\u7528\u5230\u5b83\u3002<\/p>\n

\u5b57\u7b26\u4e32\u662fJava\u9762\u8bd5\u95ee\u9898\u6216\u6d4b\u9a8c\u4e2d\u975e\u5e38\u6d41\u884c\u7684\u8bdd\u9898\uff0c\u6240\u4ee5\u6211\u6536\u96c6\u4e86\u4e00\u4e9b\u7cbe\u5f69\u4e14\u6709\u8ff7\u60d1\u6027\u7684Java\u5b57\u7b26\u4e32\u6d4b\u9a8c\u95ee\u9898\uff0c\u4f60\u53ef\u4ee5\u5c1d\u8bd5\u4e00\u4e0b\u3002<\/p>\n

Java\u5b57\u7b26\u4e32\u6d4b\u9a8c<\/h2>\n

\u8fd9\u4e2a\u6d4b\u9a8c\u5171\u670921\u4e2a\u95ee\u9898\u3002\u5982\u679c\u4f60\u80fd\u6b63\u786e\u56de\u7b5415\u4e2a\u6216\u66f4\u591a\uff0c\u90a3\u4e48\u4f60\u53ef\u4ee5\u8ba4\u4e3a\u81ea\u5df1\u5728\u5b57\u7b26\u4e32\u6982\u5ff5\u4e0a\u975e\u5e38\u64c5\u957f\u3002\u4f60\u53ef\u4ee5\u901a\u8fc7\u70b9\u51fb\u6bcf\u4e2a\u95ee\u9898\u540e\u9762\u7684\u201c\u63ed\u793a\u7b54\u6848\u201d\u6309\u94ae\u6765\u67e5\u770b\u7b54\u6848\u548c\u8be6\u7ec6\u89e3\u91ca\u3002<\/p>\n

\u8ba9\u6211\u4eec\u5f00\u59cb\u5f26\u4e50\u6d4b\u9a8c\uff0c\u795d\u4f60\u597d\u8fd0\uff01<\/p>\n

\u4e0b\u9762\u7684\u8bed\u53e5\u5c06\u4f1a\u6709\u4ec0\u4e48\u8f93\u51fa\uff1f<\/h4>\n
String s = \"Java String Quiz\";\r\nSystem.out.println(s.charAt(s.toUpperCase().length()));\r\n<\/code><\/pre>\n
A. \u5c06\u201cZ\u201d\u8f6c\u6362\u4e3a\u6574\u657090\uff0c\u5e76\u6253\u5370\u201c90\u201d
\nB. \u8fd0\u884c\u65f6\u5f02\u5e38
\nC. \u6253\u5370\u201cz\u201d
\nD. \u6253\u5370\u201cZ\u201d<\/p>\n
\u70b9\u51fb\u663e\u793a\u7b54\u6848
\n**\u6b63\u786e\u7b54\u6848\uff1aB
\n**\u8fd0\u884c\u65f6\u4f1a\u629b\u51fa\u5f02\u5e38\u3002\u7ebf\u7a0b”main”\u4e2d\u7684\u5f02\u5e38java.lang.StringIndexOutOfBoundsException: String index out of range: 16\u3002\u8fd9\u662f\u56e0\u4e3a\u7d22\u5f15\u503c\u4ece0\u5f00\u59cb\u3002<\/details>\n
\u4ee5\u4e0b\u8bed\u53e5\u7684\u8f93\u51fa\u5c06\u4f1a\u662f\u4ec0\u4e48\uff1f<\/h4>\n
String s = \"Java String Quiz\";\r\nSystem.out.println(s.substring(5,3));\r\n<\/code><\/pre>\n
A. \u6253\u5370\u201cStr\u201d
\nB. \u8fd0\u884c\u65f6\u5f02\u5e38
\nC. \u7d22\u5f15\u8d8a\u754c\u8fd0\u884c\u65f6\u5f02\u5e38
\nD. \u5b57\u7b26\u4e32\u7d22\u5f15\u8d8a\u754c\u7f16\u8bd1\u65f6\u9519\u8bef<\/p>\n
\u70b9\u51fb\u89e3\u7b54\u4f1a\u629b\u51fa\u4e00\u4e2a\u8fd0\u884c\u65f6\u5f02\u5e38\uff0c\u9519\u8bef\u4fe1\u606f\u4e3a”Exception in thread “main” java.lang.StringIndexOutOfBoundsException: begin 5, end 3, length 16″\u3002\u8fd9\u662f\u56e0\u4e3a\u7ed3\u675f\u7d22\u5f15\u5c0f\u4e8e\u5f00\u59cb\u7d22\u5f15\u3002<\/details>\n
\u9009\u62e9\u6240\u6709\u6709\u6548\u7684String\u7c7b\u65b9\u6cd5\u3002<\/h4>\n
A. \u526a\u88c1
\nB. \u5185\u90e8\u5316
\nC. \u8f6c\u6362\u4e3a\u5c0f\u5199
\nD. \u5206\u5272<\/p>\n
\u70b9\u51fb\u4ee5\u5c55\u793a\u7b54\u6848
\n\u6b63\u786e\u7b54\u6848\uff1aA\u548cB
\nString\u7c7b\u7684\u6709\u6548\u65b9\u6cd5\u6709- trim()\u3001intern()\u3001toLowerCase()\u548csplit(String regex)\u3002<\/details>\n
4. \u4ee5\u4e0b\u8bed\u53e5\u7684\u8f93\u51fa\u5c06\u4f1a\u662f\u4ec0\u4e48\uff1f<\/h4>\n
String s1 = \"Cat\";\r\nString s2 = \"Cat\";\r\nString s3 = new String(\"Cat\");\r\nSystem.out.print(s1 == s2);\r\nSystem.out.print(s1 == s3);\r\n<\/code><\/pre>\n
A. \u771f\u5047
\nB. \u771f\u771f
\nC. \u5047\u5047
\nD. \u5047\u771f<\/p>\n
\u5f53\u6211\u4eec\u4f7f\u7528\u53cc\u5f15\u53f7\u6765\u521b\u5efa\u5b57\u7b26\u4e32\u65f6\uff0c\u5b83\u9996\u5148\u5728\u5b57\u7b26\u4e32\u6c60\u4e2d\u5bfb\u627e\u5177\u6709\u76f8\u540c\u503c\u7684\u5b57\u7b26\u4e32\u3002\u5982\u679c\u627e\u5230\u4e86\uff0c\u5219\u8fd4\u56de\u8be5\u5f15\u7528\uff0c\u5426\u5219\u5b83\u4f1a\u5728\u5b57\u7b26\u4e32\u6c60\u4e2d\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5b57\u7b26\u4e32\uff0c\u7136\u540e\u8fd4\u56de\u8be5\u5f15\u7528\u3002
\n\u7136\u800c\uff0c\u4f7f\u7528new\u64cd\u4f5c\u7b26\uff0c\u6211\u4eec\u5f3a\u5236String\u7c7b\u5728\u5806\u7a7a\u95f4\u4e2d\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5b57\u7b26\u4e32\u5bf9\u8c61\u3002\u56e0\u6b64s1\u548cs2\u5c06\u5f15\u7528\u6c60\u4e2d\u7684\u540c\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u800cs3\u5c06\u662f\u6c60\u5916\u7684\u53e6\u4e00\u4e2a\u5bf9\u8c61\uff0c\u56e0\u6b64\u4ea7\u751f\u4e86\u8fd9\u4e2a\u8f93\u51fa\u3002<\/details>\n
\u4ee5\u4e0b\u54ea\u4e9b\u9648\u8ff0\u5bf9\u4e8eswitch case\u4e2d\u7684\u5b57\u7b26\u4e32\u662f\u6b63\u786e\u7684\uff1f<\/h4>\n
A. \u4eceJava 1.5\u6216\u66f4\u9ad8\u7248\u672c\u5f00\u59cb\uff0cswitch case\u8bed\u53e5\u4e2d\u5141\u8bb8\u4f7f\u7528\u5b57\u7b26\u4e32\u3002
\nB. \u4eceJava 1.7\u6216\u66f4\u9ad8\u7248\u672c\u5f00\u59cb\uff0cswitch case\u8bed\u53e5\u4e2d\u5141\u8bb8\u4f7f\u7528\u5b57\u7b26\u4e32\u3002
\nC. switch-case\u5b9e\u73b0\u4e2d\u4f7f\u7528\u4e86equals()\u65b9\u6cd5\uff0c\u56e0\u6b64\u6dfb\u52a0null\u68c0\u67e5\u4ee5\u907f\u514d\u7a7a\u6307\u9488\u5f02\u5e38\u3002<\/p>\n
\u70b9\u51fb\u67e5\u770b\u7b54\u6848
\n\u6b63\u786e\u7b54\u6848\uff1aB\uff0cC
\n\u9605\u8bfb\u66f4\u591a\u5173\u4e8eJava switch case\u5b57\u7b26\u4e32\u7684\u5185\u5bb9<\/details>\n
6. \u4ee5\u4e0b\u54ea\u4e9b\u9648\u8ff0\u5bf9\u4e8eStringBuffer\u548cStringBuilder\u662f\u6b63\u786e\u7684\uff1f<\/h4>\n
A. StringBuilder \u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u3002
\nB. StringBuffer \u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u56e0\u4e3a\u5b83\u7684\u65b9\u6cd5\u662f\u540c\u6b65\u7684\u3002
\nC. StringBuilder \u5728 Java 1.4 \u7248\u672c\u4e2d\u88ab\u5f15\u5165\u3002
\nD. StringBuffer \u548c StringBuilder \u90fd\u662f\u4e0d\u53ef\u53d8\u7684\u3002<\/p>\n
\u70b9\u51fb\u4ee5\u663e\u793a\u7b54\u6848
\n\u6b63\u786e\u7b54\u6848\uff1aA\u3001B
\nStringBuffer\u5bf9\u8c61\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u56e0\u4e3a\u5b83\u7684\u65b9\u6cd5\u662f\u540c\u6b65\u7684\u3002\u4f46\u662f\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u8fd9\u662f\u4e00\u79cd\u5f00\u9500\uff0c\u56e0\u6b64\u5728Java 1.5\u4e2d\u5f15\u5165\u4e86StringBuilder\u3002StringBuilder\u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u3002StringBuffer\u548cStringBuilder\u90fd\u662f\u53ef\u53d8\u7684\u7c7b\u3002\u8bf7\u5728String vs StringBuffer vs StringBuilder\u4e2d\u4e86\u89e3\u66f4\u591a\u4fe1\u606f\u3002<\/details>\n
7. \u5b57\u7b26\u4e32\u7684\u5b9e\u73b0\u9075\u5faa\u4ee5\u4e0b\u54ea\u79cd\u8bbe\u8ba1\u6a21\u5f0f\uff1f<\/h4>\n
A. \u4eab\u5143\u8bbe\u8ba1\u6a21\u5f0f
\nB. \u5de5\u5382\u6a21\u5f0f
\nC. \u5355\u4f8b\u6a21\u5f0f
\nD. \u4ee5\u4e0a\u90fd\u4e0d\u662f<\/p>\n
\u70b9\u51fb\u63ed\u793a\u7b54\u6848
\n\u6b63\u786e\u7b54\u6848\uff1aA
\n\u5b57\u7b26\u4e32\u6c60\u5b9e\u73b0\u9075\u5faa\u4eab\u5143\u8bbe\u8ba1\u6a21\u5f0f\u3002<\/details>\n
\u4ee5\u4e0b\u8bed\u53e5\u7684\u8f93\u51fa\u5c06\u662f\u4ec0\u4e48\uff1f<\/h4>\n
String s1 = \"abc\";\r\nString s2 = \"def\";\r\nSystem.out.println(s1.compareTo(s2));\r\n<\/code><\/pre>\n
A. \u96f6
\nB. \u771f
\nC. \u8d1f\u4e09
\nD. \u5047<\/p>\n
\u4eceString compareTo()\u65b9\u6cd5\u7684\u6587\u6863\u4e2d\u53ef\u4ee5\u5f97\u77e5\uff0ccompareTo\u65b9\u6cd5\u662f\u7528\u6765\u6bd4\u8f83\u4e24\u4e2a\u5b57\u7b26\u4e32\u7684\u5b57\u5178\u987a\u5e8f\u7684\u3002\u6bd4\u8f83\u662f\u57fa\u4e8e\u5b57\u7b26\u4e32\u4e2d\u6bcf\u4e2a\u5b57\u7b26\u7684Unicode\u503c\u8fdb\u884c\u7684\u3002\u5c06\u8be5String\u5bf9\u8c61\u8868\u793a\u7684\u5b57\u7b26\u5e8f\u5217\u4e0e\u53c2\u6570\u5b57\u7b26\u4e32\u8868\u793a\u7684\u5b57\u7b26\u5e8f\u5217\u8fdb\u884c\u5b57\u5178\u987a\u5e8f\u6bd4\u8f83\u3002\u5982\u679c\u8be5String\u5bf9\u8c61\u6309\u5b57\u5178\u987a\u5e8f\u4f4d\u4e8e\u53c2\u6570\u5b57\u7b26\u4e32\u4e4b\u524d\uff0c\u5219\u7ed3\u679c\u662f\u4e00\u4e2a\u8d1f\u6574\u6570\u3002\u5982\u679c\u8be5String\u5bf9\u8c61\u6309\u5b57\u5178\u987a\u5e8f\u4f4d\u4e8e\u53c2\u6570\u5b57\u7b26\u4e32\u4e4b\u540e\uff0c\u5219\u7ed3\u679c\u662f\u4e00\u4e2a\u6b63\u6574\u6570\u3002\u5982\u679c\u4e24\u4e2a\u5b57\u7b26\u4e32\u76f8\u7b49\uff0c\u5219\u7ed3\u679c\u4e3a\u96f6\uff1b\u5f53equals(Object)\u65b9\u6cd5\u8fd4\u56detrue\u65f6\uff0ccompareTo\u8fd4\u56de0\u3002\u8fd9\u5c31\u662f\u5b57\u5178\u987a\u5e8f\u7684\u5b9a\u4e49\u3002\u5982\u679c\u4e24\u4e2a\u5b57\u7b26\u4e32\u4e0d\u540c\uff0c\u90a3\u4e48\u5b83\u4eec\u53ef\u80fd\u5728\u67d0\u4e9b\u7d22\u5f15\u4f4d\u7f6e\u4e0a\u5177\u6709\u4e0d\u540c\u7684\u5b57\u7b26\uff0c\u6216\u8005\u5b83\u4eec\u7684\u957f\u5ea6\u4e0d\u540c\uff0c\u6216\u8005\u4e8c\u8005\u90fd\u6709\u3002\u5982\u679c\u5b83\u4eec\u5728\u4e00\u4e2a\u6216\u591a\u4e2a\u7d22\u5f15\u4f4d\u7f6e\u4e0a\u5177\u6709\u4e0d\u540c\u7684\u5b57\u7b26\uff0c\u5047\u8bbek\u662f\u6700\u5c0f\u7684\u8fd9\u6837\u7684\u7d22\u5f15\uff1b\u90a3\u4e48\u5728\u4f4d\u7f6ek\u4e0a\u7684\u5b57\u7b26\u503c\u8f83\u5c0f\u7684\u5b57\u7b26\u4e32\uff0c\u6309\u7167\u4f7f\u7528<\u8fd0\u7b97\u7b26\u7684\u5b57\u5178\u987a\u5e8f\u5148\u4e8e\u53e6\u4e00\u4e2a\u5b57\u7b26\u4e32\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0ccompareTo\u8fd4\u56de\u4e24\u4e2a\u5b57\u7b26\u4e32\u5728\u4f4d\u7f6ek\u4e0a\u7684\u5b57\u7b26\u503c\u7684\u5dee\u503c\uff1a
\nthis.charAt(k)-anotherString.charAt(k)<\/p>\n
\u5728\u6211\u4eec\u7684\u4f8b\u5b50\u4e2d\uff0c\u201cabc\u201d\u5728\u201cdef\u201d\u4e4b\u524d\uff0c\u56e0\u6b64\u8fd4\u56de\u4e00\u4e2a\u8d1f\u6574\u6570\u3002\u7136\u540e\u627e\u5230\u7b2c\u4e00\u4e2a\u4e0d\u540c\u5b57\u7b26\u7684\u6700\u5c0f\u7d22\u5f15\uff0c\u53730\uff0c\u540c\u65f6a\u548cd\u76f8\u5dee-3\u3002<\/p>\n<\/details>\n
9. \u4ee5\u4e0b\u7a0b\u5e8f\u7684\u8f93\u51fa\u7ed3\u679c\u4f1a\u662f\u4ec0\u4e48\uff1f<\/h4>\n
public class Test {\r\n\tpublic static void main(String[] args) {\r\n\t\tString x = \"abc\";\r\n\t\tString y = \"abc\";\r\n\t\tx.concat(y);\r\n\t\tSystem.out.print(x);\r\n\t}\r\n}\r\n<\/code><\/pre>\n
A. abc – \u4e16\u754c<\/p>\n
B. abcabc – \u679c\u56ed\u679c\u56ed<\/p>\n
C. null – \u672a\u5b9a\u4e49<\/p>\n
\u70b9\u51fb\u63ed\u793a\u7b54\u6848
\n\u6b63\u786e\u7b54\u6848\uff1aA
\nx.concat(y) \u5c06\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5b57\u7b26\u4e32\uff0c\u4f46\u5b83\u6ca1\u6709\u5206\u914d\u7ed9 x\uff0c\u6240\u4ee5 x \u7684\u503c\u5e76\u672a\u6539\u53d8\u3002<\/details>\n
\u4ee5\u4e0b\u7a0b\u5e8f\u5c06\u8f93\u51fa\u4ec0\u4e48\uff1f<\/h4>\n
public class Test {\r\n\tpublic static void main(String[] args) {\r\n\t\tString s1 = \"abc\";\r\n\t\tString s2 = \"abc\";\r\n\t\tSystem.out.println(\"s1 == s2 is:\" + s1 == s2);\r\n\t}\r\n}\r\n<\/code><\/pre>\n
A. \u9519\u8bef
\nB. s1 == s2 \u662f\u771f\u7684
\nC. s1 == s2 \u662f\u5047\u7684
\nD. \u771f\u7684<\/p>\n
\u70b9\u51fb\u663e\u793a\u7b54\u6848
\n\u6b63\u786e\u7b54\u6848\uff1aA
\n\u7ed9\u5b9a\u7684\u8bed\u53e5\u7684\u8f93\u51fa\u7ed3\u679c\u5c06\u662f\u201cfalse\u201d\uff0c\u56e0\u4e3a\u5728Java\u4e2d\uff0c”+”\u8fd0\u7b97\u7b26\u7684\u4f18\u5148\u7ea7\u9ad8\u4e8e”==”\u8fd0\u7b97\u7b26\u3002\u56e0\u6b64\uff0c\u7ed9\u5b9a\u7684\u8868\u8fbe\u5f0f\u5c06\u88ab\u8ba1\u7b97\u4e3a\u201cs1 == s2 is:abc\u201d == “abc”\uff0c\u5373\u4e3afalse\u3002<\/details>\n
11. \u4ee5\u4e0b\u8bed\u53e5\u7684\u8f93\u51fa\u5c06\u662f\u4ec0\u4e48\uff1f<\/h4>\n
String s = \"Java\"+1+2+\"Quiz\"+\"\"+(3+4);\r\nSystem.out.println(s);\r\n<\/code><\/pre>\n
A. Java3Quiz7 –
\n\u7b54\u6848\uff1aA. Java3\u6d4b\u9a8c7
\nB. Java12\u6d4b\u9a8c7
\nC. Java12\u6d4b\u9a8c34
\nD. Java3\u6d4b\u9a8c34<\/p>\n
\u9996\u5148\uff0c\u6267\u884c\u62ec\u53f7\u4e2d\u7684\u8868\u8fbe\u5f0f\u3002\u7136\u540e\u662f\u6240\u6709\u7684\u52a0\u53f7\u8fd0\u7b97\u7b26\uff0c\u6240\u4ee5\u5b83\u4eec\u4ece\u5de6\u5230\u53f3\u4f9d\u6b21\u6267\u884c\u3002\u6211\u4eec\u901a\u8fc7\u6bcf\u4e2a\u62fc\u63a5\u64cd\u4f5c\u5f97\u5230\u4e00\u4e2aString\uff0c\u56e0\u6b64\u8f93\u51fa\u7ed3\u679c\u5982\u4e0b\u6240\u793a\u3002
\n\u201cJava\u201d+1+2+\u201cQuiz\u201d+\u201c\u201d+(3+4)
\n= \u201cJava\u201d+1+2+\u201cQuiz\u201d+\u201c\u201d+7
\n= \u201cJava1\u201d+2+\u201cQuiz\u201d+\u201c\u201d+7
\n= \u201cJava12\u201d+\u201cQuiz\u201d+\u201c\u201d+7
\n= \u201cJava12Quiz\u201d+\u201c\u201d+7
\n= \u201cJava12Quiz\u201d+7
\n= \u201cJava12Quiz7\u201d<\/p>\n<\/details>\n
12. \u5728\u4e0b\u9762\u7684\u8bed\u53e5\u4e2d\u521b\u5efa\u4e86\u591a\u5c11\u4e2aString\u5bf9\u8c61\uff1f<\/h4>\n
String s = \"abc\"; \/\/ statement 1\r\nString s1 = new String(\"abcd\"); \/\/ statement 2\r\n<\/code><\/pre>\n
A. \u4e00
\nB. \u4e8c
\nC. \u4e09
\nD. \u56db<\/p>\n
\u70b9\u51fb\u663e\u793a\u7b54\u6848
\n\u6b63\u786e\u7b54\u6848\uff1aC
\n\u5728\u8bed\u53e51\u4e2d\uff0c\u201cabc\u201d\u88ab\u521b\u5efa\u5728\u5b57\u7b26\u4e32\u6c60\u4e2d\u3002
\n\u5728\u8bed\u53e52\u4e2d\uff0c\u9996\u5148\u5728\u5b57\u7b26\u4e32\u6c60\u4e2d\u521b\u5efa\u4e86\u201cabcd\u201d\u3002\u7136\u540e\u5b83\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9String\u7684new\u8fd0\u7b97\u7b26\uff0c\u53e6\u4e00\u4e2a\u5b57\u7b26\u4e32\u5728\u5806\u5185\u5b58\u4e2d\u88ab\u521b\u5efa\u3002
\n\u56e0\u6b64\u603b\u5171\u521b\u5efa\u4e863\u4e2a\u5b57\u7b26\u4e32\u5bf9\u8c61\u3002<\/details>\n
\u4ee5\u4e0b\u8bed\u53e5\u5c06\u8f93\u51fa\u4ec0\u4e48\u5185\u5bb9\uff1f<\/h4>\n
String s1 = \"abc\";\r\nString s2 = new String(\"abc\");\r\nSystem.out.print(s1==s2);\r\nSystem.out.println(s1==s2.intern());\r\n<\/code><\/pre>\n
A. \u771f\u5047
\nB. \u5047\u5047
\nC. \u771f\u771f
\nD. \u771f\u5047<\/p>\n
\u70b9\u51fb\u201c\u663e\u793a\u7b54\u6848\u201d
\n\u6b63\u786e\u7b54\u6848\uff1aA
\n\u5b57\u7b26\u4e32s1\u5728\u5b57\u7b26\u4e32\u6c60\u4e2d\uff0c\u800cs2\u5728\u5806\u5185\u5b58\u4e2d\u521b\u5efa\u3002
\n\u56e0\u6b64s1==s2\u5c06\u8fd4\u56defalse\u3002
\n\u5f53\u8c03\u7528s2.intern()\u65b9\u6cd5\u65f6\uff0c\u5b83\u4f1a\u68c0\u67e5\u5b57\u7b26\u4e32\u6c60\u4e2d\u662f\u5426\u6709\u201cabc\u201d\u503c\u7684\u5b57\u7b26\u4e32\u3002\u56e0\u6b64\u5b83\u8fd4\u56des1\u7684\u5f15\u7528\u3002\u73b0\u5728s1\u548cs2\u90fd\u6307\u5411\u540c\u4e00\u4e2a\u5b57\u7b26\u4e32\u5b9e\u4f8b\u3002
\n\u56e0\u6b64s1==s2.intern()\u5c06\u8fd4\u56detrue\u3002<\/details>\n
\u9009\u62e9\u6240\u6709\u7531String\u7c7b\u5b9e\u73b0\u7684\u63a5\u53e3\u3002<\/h4>\n
A. \u53ef\u5e8f\u5217\u5316\u7684
\nB. \u53ef\u6bd4\u8f83\u7684
\nC. \u8b66\u5b98
\nD. \u53ef\u514b\u9686\u7684<\/p>\n
\u70b9\u51fb\u67e5\u770b\u7b54\u6848
\n\u6b63\u786e\u7b54\u6848\uff1aA, B, C
\nString\u662f\u53ef\u5e8f\u5217\u5316\u548c\u53ef\u6bd4\u8f83\u7684\u3002Constable\u662fJava 12\u53d1\u5e03\u7684\u4e00\u4e2a\u65b0\u63a5\u53e3\u3002<\/details>\n
\u9009\u62e9\u6240\u6709\u4f7fString\u6210\u4e3aMap\u952e\u7684\u7406\u7531\u3002<\/h4>\n
A. \u5b57\u7b26\u4e32\u662f\u4e0d\u53ef\u53d8\u7684
\nB. \u5b57\u7b26\u4e32\u662f\u6700\u7ec8\u7684
\nC. \u5b57\u7b26\u4e32\u6b63\u786e\u5b9e\u73b0\u4e86hashCode() \u548c equals() \u65b9\u6cd5
\nC. \u5b57\u7b26\u4e32\u7684hashCode\u88ab\u7f13\u5b58<\/p>\n
\u70b9\u51fb\u663e\u793a\u7b54\u6848
\n**\u6b63\u786e\u7b54\u6848\uff1aA\uff0cB\uff0cC
\n**
\n\u5bf9\u4e8e Map \u7684\u952e\uff0c\u6b63\u786e\u5b9e\u73b0 hashCode() \u548c equals() \u65b9\u6cd5\u662f\u5fc5\u987b\u7684\u3002\u7531\u4e8e\u8be5\u5b57\u7b26\u4e32\u662f final \u548c\u4e0d\u53ef\u53d8\u7684\uff0c\u6240\u4ee5\u4e0d\u5b58\u5728\u952e\u6570\u636e\u635f\u574f\u7684\u53ef\u80fd\u3002<\/details>\n
16. \u4ee5\u4e0b\u4ee3\u7801\u7247\u6bb5\u7684\u8f93\u51fa\u5c06\u662f\u4ec0\u4e48\uff1f<\/h4>\n
String s1 = new String(\"java\");\r\nString s2 = new String(\"JAVA\");\r\nSystem.out.println(s1 = s2);\r\n<\/code><\/pre>\n
A. Java
\nB. Java
\nC. \u771f
\nD. \u5047<\/p>\n
\u5f53\u5217\u5370\u65b9\u6cd5\u5185\u7684\u53c2\u6570\u4e3a\u8d4b\u503c\u8bed\u53e5\u65f6\uff0c\u5b83\u4f1a\u6253\u5370\u51fa”JAVA”\u3002\u56e0\u6b64\u5b83\u5c06\u88ab\u89c6\u4e3aSystem.out.println(“JAVA”)\u3002<\/details>\n
17. \u4ee5\u4e0b\u8bed\u53e5\u7684\u8f93\u51fa\u5c06\u662f\u4ec0\u4e48\uff1f<\/h4>\n
String s1 = \"abc\";\r\nStringBuffer s2 = new StringBuffer(s1);\r\nSystem.out.println(s1.equals(s2));\r\n<\/code><\/pre>\n
A. \u9519\u8bef
\nB. \u6b63\u786e
\nC. \u8fd0\u884c\u65f6\u7684ClassCastException
\nD. \u7f16\u8bd1\u65f6\u9519\u8bef<\/p>\n
\u70b9\u51fb\u663e\u793a\u7b54\u6848
\n\u6b63\u786e\u7b54\u6848\uff1aA
\n\u5b83\u4f1a\u6253\u5370\u51fafalse\uff0c\u56e0\u4e3as2\u4e0d\u662fString\u7c7b\u578b\u3002\u5982\u679c\u4f60\u770b\u4e00\u4e0bString\u7684equals()\u65b9\u6cd5\u7684\u5b9e\u73b0\uff0c\u4f60\u4f1a\u53d1\u73b0\u5b83\u4f7f\u7528instanceof\u8fd0\u7b97\u7b26\u8fdb\u884c\u68c0\u67e5\uff0c\u4ee5\u68c0\u67e5\u4f20\u5165\u7684\u5bf9\u8c61\u7684\u7c7b\u578b\u662f\u5426\u662fString\uff1f\u5982\u679c\u4e0d\u662f\uff0c\u5219\u8fd4\u56defalse\u3002<\/details>\n
18. \u4ee5\u4e0b\u4ee3\u7801\u7247\u6bb5\u7684\u8f93\u51fa\u7ed3\u679c\u5c06\u4f1a\u662f\u4ec0\u4e48\uff1f<\/h4>\n
String s1 = \"abc\";\r\nString s2 = new String(\"abc\");\r\ns2.intern();\r\nSystem.out.println(s1 == s2);\r\n<\/code><\/pre>\n
A. \u9519\u8bef
\nB. \u6b63\u786e
\nC. \u65e0\u503c<\/p>\n
\u70b9\u51fb\u663e\u793a\u7b54\u6848 \u6b63\u786e\u7b54\u6848\uff1aA \u8fd9\u662f\u4e00\u4e2a\u68d8\u624b\u7684\u95ee\u9898\uff0c\u8f93\u51fa\u7ed3\u679c\u5c06\u662ffalse\u3002\u6211\u4eec\u77e5\u9053intern()\u65b9\u6cd5\u4f1a\u4ece\u5b57\u7b26\u4e32\u6c60\u4e2d\u8fd4\u56deString\u5bf9\u8c61\u7684\u5f15\u7528\uff0c\u4f46\u7531\u4e8e\u6211\u4eec\u6ca1\u6709\u5c06\u5176\u8d4b\u503c\u7ed9s2\uff0c\u6240\u4ee5s2\u6ca1\u6709\u53d1\u751f\u53d8\u5316\u3002\u56e0\u6b64s1\u548cs2\u90fd\u5177\u6709\u4e0d\u540c\u7684\u5f15\u7528\u3002\u5982\u679c\u6211\u4eec\u5c06\u7b2c3\u884c\u7684\u4ee3\u7801\u6539\u4e3as2 = s2.intern();\uff0c\u5219\u8f93\u51fa\u7ed3\u679c\u5c06\u4e3atrue\u3002<\/details>\n
19. \u9009\u62e9\u6240\u6709\u7ee7\u627f\u4e86String\u7c7b\u7684\u7c7b\u3002 String de .)<\/h4>\n
A. StringBuffer – \u5b57\u7b26\u4e32\u7f13\u51b2\u5668
\nB. StringBuilder – \u5b57\u7b26\u4e32\u751f\u6210\u5668
\nC. StringWriter – \u5b57\u7b26\u4e32\u5199\u5165\u5668
\nD. None – \u65e0<\/p>\n
\u70b9\u51fb\u663e\u793a\u7b54\u6848
\n**\u6b63\u786e\u7b54\u6848\uff1aD**
\n\u8fd9\u662f\u4e00\u4e2a\u68d8\u624b\u7684\u95ee\u9898\u3002String\u7c7b\u662ffinal\u7c7b\uff0c\u6240\u4ee5\u65e0\u6cd5\u901a\u8fc7\u7ee7\u627f\u6765\u6269\u5c55\u5b83\u3002<\/details>\n
\u4ee5\u4e0b\u54ea\u4e9b\u5173\u4e8eJava\u4e2d\u7684String\u5b57\u7b26\u4e32\u7684\u9648\u8ff0\u662f\u6b63\u786e\u7684\uff1f<\/h4>\n
A. \u6211\u4eec\u53ef\u4ee5\u50cfStringBuffer\u4e00\u6837\u6269\u5c55String\u7c7b\u3002
\nB. String\u7c7b\u5728java.util\u5305\u4e2d\u5b9a\u4e49\u3002
\nC. \u5728Java\u4e2d\uff0cString\u662f\u4e0d\u53ef\u53d8\u7684\u3002
\nD. \u5728Java\u4e2d\uff0cString\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u3002
\nE. \u5728Java\u4e2d\uff0cString\u5bf9\u5927\u5c0f\u5199\u654f\u611f\u3002<\/p>\n
\u5b57\u7b26\u4e32\u7c7b\u65e0\u6cd5\u6269\u5c55\uff0c\u56e0\u4e3a\u5b83\u662ffinal\u7684\u3002StringBuffer\u7c7b\u6ca1\u6709\u7ee7\u627f\u5b83\u3002String\u7c7b\u5b9a\u4e49\u5728java.lang\u5305\u4e2d\u3002\u5b57\u7b26\u4e32\u5728Java\u4e2d\u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u56e0\u6b64\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u3002\u5b57\u7b26\u4e32\u662f\u533a\u5206\u5927\u5c0f\u5199\u7684\uff0c\u6240\u4ee5\u201cabc\u201d\u4e0d\u7b49\u4e8e\u201cABC\u201d\u3002<\/details>\n
21. \u4ee5\u4e0b\u8bed\u53e5\u7684\u8f93\u51fa\u5c06\u662f\u4ec0\u4e48\uff1f<\/h4>\n
String s1 = null;\r\nSystem.out.print(s1); \/\/ line 2\r\nSystem.out.print(s1.toString()); \/\/ line 3\r\n<\/code><\/pre>\n
A. \u7a7a\u503c\u7a7a\u503c
\nB. \u7a7a\u503c\u8ddf\u968fNullPointerException
\nC. NullPointerException<\/p>\n
\u70b9\u51fb\u663e\u793a\u7b54\u6848
\n\u6b63\u786e\u7b54\u6848\uff1aB
\n\u7b2c2\u884c\u4f1a\u6253\u5370\u51fanull\uff0c\u56e0\u4e3aprint\u65b9\u6cd5\u6709\u4e00\u4e2a\u7a7a\u503c\u68c0\u67e5\uff0c\u5982\u4e0b\u6240\u793a\uff1a
\n\u5982\u679c(s == null) { s = “null”; }
\n\u7b2c3\u884c\u5c06\u629b\u51faNullPointerException\uff0c\u56e0\u4e3a\u6211\u4eec\u8bd5\u56fe\u5728\u7a7a\u503c\u4e0a\u8c03\u7528toString()\u51fd\u6570\u3002<\/details>\n
\u7ed3\u8bba<\/h2>\n
\u6211\u5728\u8fd9\u4efd\u6d4b\u9a8c\u4e2d\u8bd5\u56fe\u6db5\u76d6\u5b57\u7b26\u4e32\u7684\u5927\u90e8\u5206\u91cd\u8981\u5185\u5bb9\u3002\u5982\u679c\u4f60\u8ba4\u4e3a\u6709\u4e00\u4e9b\u6709\u8da3\u7684\u6982\u5ff5\u88ab\u9057\u6f0f\u4e86\uff0c\u8bf7\u901a\u8fc7\u8bc4\u8bba\u544a\u8bc9\u6211\u3002\u5982\u679c\u4f60\u559c\u6b22\u8fd9\u4efd\u6d4b\u9a8c\uff0c\u4e5f\u8bf7\u4e0e\u4ed6\u4eba\u5206\u4eab\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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