{"id":189,"date":"2024-02-19T06:01:11","date_gmt":"2023-02-04T18:28:33","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/%e5%9c%a8java%e4%b8%ad%e7%bc%96%e5%86%99%e5%ad%97%e7%ac%a6%e4%b8%b2%e7%a8%8b%e5%ba%8f\/"},"modified":"2025-08-01T02:08:13","modified_gmt":"2025-07-31T18:08:13","slug":"%e5%9c%a8java%e4%b8%ad%e7%bc%96%e5%86%99%e5%ad%97%e7%ac%a6%e4%b8%b2%e7%a8%8b%e5%ba%8f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8java%e4%b8%ad%e7%bc%96%e5%86%99%e5%ad%97%e7%ac%a6%e4%b8%b2%e7%a8%8b%e5%ba%8f\/","title":{"rendered":"Java\u5b57\u7b26\u4e32\u7f16\u7a0b\uff1a\u4ece\u57fa\u7840\u5230\u9ad8\u6548\u5b9e\u8df5"},"content":{"rendered":"

\u5728Java\u7f16\u7a0b\u4e2d\uff0cString<\/code> \u662f\u6700\u5e38\u7528\u7684\u7c7b\u3002\u56e0\u6b64\uff0c\u5728Java\u9762\u8bd5\u4e2d\uff0c\u7ecf\u5e38\u4f1a\u901a\u8fc7\u8003\u5bdf\u5b57\u7b26\u4e32\u7a0b\u5e8f\u6765\u8bc4\u4f30\u5019\u9009\u4eba\u7684\u7f16\u7801\u80fd\u529b\u3002<\/p>\n

\u4f7f\u7528Java\u7f16\u5199\u5b57\u7b26\u4e32\u7a0b\u5e8f<\/h2>\n

\u5728\u8fd9\u91cc\uff0c\u6211\u5c06\u63d0\u4f9b\u4e00\u4e9bJava\u5b57\u7b26\u4e32\u7f16\u7a0b\u793a\u4f8b\uff0c\u5e2e\u52a9\u60a8\u63d0\u5347\u7f16\u7801\u6280\u80fd\u3002\u5728\u67e5\u770b\u7b54\u6848\u4e4b\u524d\uff0c\u8bf7\u5c1d\u8bd5\u81ea\u5df1\u89e3\u51b3\u8fd9\u4e9b\u95ee\u9898\uff0c\u4ee5\u83b7\u5f97\u66f4\u597d\u7684\u5b66\u4e60\u6548\u679c\u3002\u6211\u5df2\u5c3d\u529b\u4f7f\u7528Java\u4e2d\u5f15\u5165\u7684\u6240\u6709\u6700\u65b0\u529f\u80fd\uff0c\u5982\u6d41\uff08Stream\uff09\u3001Lambda\u8868\u8fbe\u5f0f\u548c\u51fd\u6570\u5f0f\u63a5\u53e3\u7b49\u3002<\/p>\n

\u5982\u4f55\u5728\u4e00\u4e2a\u5b57\u7b26\u4e32\u4e2d\u83b7\u53d6\u4e0d\u540c\u5b57\u7b26\u53ca\u5176\u6570\u91cf\uff1f<\/h3>\n
package com.Olivia.java.string;\r\n\r\nimport java.util.HashMap;\r\nimport java.util.List;\r\nimport java.util.Map;\r\nimport java.util.stream.Collectors;\r\n\r\npublic class DistinctCharsCount {\r\n\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\tprintDistinctCharsWithCount(\"abc\");\r\n\t\tprintDistinctCharsWithCount(\"abcab3\");\r\n\t\tprintDistinctCharsWithCount(\"hi there, i am scdev\");\r\n\t}\r\n\r\n\tprivate static void printDistinctCharsWithCount(String input) {\r\n\t\tMap<Character, Integer> charsWithCountMap = new HashMap<>();\r\n\r\n\t\t\/\/ \u4f7f\u7528Java 8\u7684Map merge\u65b9\u6cd5\r\n\t\tfor (char c : input.toCharArray())\r\n\t\t\tcharsWithCountMap.merge(c, 1, Integer::sum);\r\n\t\tSystem.out.println(charsWithCountMap);\r\n\r\n\t\t\/\/ \u53e6\u4e00\u79cd\u4f7f\u7528\u6700\u65b0Java\u589e\u5f3a\u529f\u80fd\u4e14\u4e0d\u4f7f\u7528for\u5faa\u73af\u7684\u65b9\u6cd5\uff0c\u4f46\u7565\u663e\u590d\u6742\r\n\t\tList<Character> list = input.chars().mapToObj(c -> (char) c).collect(Collectors.toList());\r\n\r\n\t\tlist.stream().forEach(c -> charsWithCountMap.merge(c, 1, Integer::sum));\r\n\r\n\t\tSystem.out.println(charsWithCountMap);\r\n\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
\u8bf7\u7f16\u5199\u4e00\u4e2aJava\u7a0b\u5e8f\uff0c\u7528\u4e8e\u53cd\u8f6c\u5b57\u7b26\u4e32\u3002<\/h3>\n
\u6709\u8bb8\u591a\u65b9\u6cd5\u53ef\u4ee5\u53cd\u8f6c\u4e00\u4e2a\u5b57\u7b26\u4e32\u3002\u5176\u4e2d\u4e00\u4e9b\u5e38\u89c1\u7684\u65b9\u6cd5\u5305\u62ec\uff1a<\/p>\n
    \n
  • \u4f7f\u7528 StringBuilder\/StringBuffer<\/code> \u7684 reverse()<\/code> \u65b9\u6cd5<\/li>\n
  • \u4f7f\u7528\u5b57\u7b26\/\u5b57\u8282\u6570\u7ec4\u5e76\u53cd\u5411\u904d\u5386\uff0c\u7136\u540e\u6784\u5efa\u7ed3\u679c\u5b57\u7b26\u4e32<\/li>\n<\/ul>\n
    \u7136\u800c\uff0c\u5982\u679c\u60a8\u4e0d\u786e\u5b9a\u8f93\u5165\u5b57\u7b26\u4e32\u7684\u5185\u5bb9\uff0c\u59cb\u7ec8\u5efa\u8bae\u4f7f\u7528 StringBuilder<\/code> \u5185\u7f6e\u7684 reverse()<\/code> \u65b9\u6cd5\u3002\u56e0\u4e3a\u4f7f\u7528\u5b57\u7b26\u548c\u5b57\u8282\u6570\u7ec4\u53ef\u80fd\u4f1a\u4ea7\u751f\u610f\u60f3\u4e0d\u5230\u7684\u7ed3\u679c\u3002\u6211\u5728\u300aJava\u4e2d\u7684\u5b57\u7b26\u4e32\u53cd\u8f6c\u300b\u4e2d\u5bf9\u6b64\u8fdb\u884c\u4e86\u8be6\u7ec6\u89e3\u91ca\u3002<\/p>\n
    package com.Olivia.java.string;\r\n\r\npublic class ReverseAString {\r\n\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\treverseInputString(\"abc\");\r\n\t\treverseInputString(\"\u00e7\u00a9\u2206\u02d9\u00a8\u02da\u00f8\"); \/\/\u7279\u6b8a\u5b57\u7b26\r\n\t}\r\n\r\n\tprivate static void reverseInputString(String input) {\r\n\t\tStringBuilder sb = new StringBuilder(input);\r\n\t\tString result = sb.reverse().toString();\r\n\t\tSystem.out.println(result);\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
    \u5982\u4f55\u68c0\u67e5\u4e00\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u4e3a\u56de\u6587\uff1f<\/h3>\n
    \u56de\u6587\u5b57\u7b26\u4e32\u662f\u6307\u5176\u53cd\u8f6c\u540e\u4ecd\u7136\u662f\u540c\u4e00\u4e2a\u5b57\u7b26\u4e32\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u8f93\u5165\u7684\u5b57\u7b26\u4e32\u53cd\u8f6c\uff0c\u5e76\u68c0\u67e5\u4e24\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u76f8\u7b49\u3002\u6216\u8005\uff0c\u6211\u4eec\u53ef\u4ee5\u5de7\u5999\u5730\u4f7f\u7528 String<\/code> \u7684 charAt(int index)<\/code> \u65b9\u6cd5\u6765\u68c0\u67e5\u56de\u6587\u5b57\u7b26\u4e32\u3002<\/p>\n
    package com.Olivia.java.string;\r\n\r\npublic class PalindromeString {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\t\r\n\t\tcheckPalindromeString(\"abc\");\r\n\t\tcheckPalindromeString(\"abcba\");\r\n\t\tcheckPalindromeString(\"\u00e7\u2202\u00a9\u2202\u00e7\");\r\n\t}\r\n\r\n\tprivate static void checkPalindromeString(String input) {\r\n\t\tboolean result = true;\r\n\t\tint length = input.length();\r\n\t\tfor(int i=0; i < length\/2; i++) {\r\n\t\t\tif(input.charAt(i) != input.charAt(length-i-1)) {\r\n\t\t\t\tresult = false;\r\n\t\t\t\tbreak;\r\n\t\t\t}\r\n\t\t}\r\n\t\tSystem.out.println(input + \" is palindrome = \"+result);\r\n\t\t\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
    \u5982\u4f55\u4ece\u8f93\u5165\u5b57\u7b26\u4e32\u4e2d\u5220\u9664\u6240\u6709\u7ed9\u5b9a\u5b57\u7b26\u7684\u51fa\u73b0\uff1f<\/h3>\n
    String<\/code> \u7c7b\u4e2d\u6ca1\u6709\u76f4\u63a5\u7684\u5220\u9664\u51fd\u6570\uff0c\u4f46\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 replaceAll()<\/code> \u65b9\u6cd5\u3002\u4e0b\u9762\u662f\u6f14\u793a\u5982\u4f55\u64cd\u4f5c\u7684\u7b80\u5355\u7a0b\u5e8f\u3002<\/p>\n
    package com.Olivia.java.string;\r\n\r\npublic class RemoveCharFromString {\r\n\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\tremoveCharFromString(\"abcbcdjfkd\", 'c');\r\n\t\tremoveCharFromString(\"Pankaj\", 'a');\r\n\t\tremoveCharFromString(\"\u00e7\u2202\u00a9\u2202\u00e7\", '\u00a9');\r\n\r\n\t}\r\n\r\n\tprivate static void removeCharFromString(String input, char c) {\r\n\t\tString result = input.replaceAll(String.valueOf(c), \"\");\r\n\t\tSystem.out.println(result);\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
    \u5982\u4f55\u5728\u7a0b\u5e8f\u4e2d\u8bc1\u660e\u5b57\u7b26\u4e32\u662f\u4e0d\u53ef\u53d8\u7684\uff1f<\/h3>\n
    \u6211\u4eec\u90fd\u77e5\u9053\u5728Java\u4e2d String<\/code> \u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u4f46\u662f\u65b0\u624b\u5f00\u53d1\u8005\u4ecd\u7136\u4f1a\u5bf9\u6b64\u611f\u5230\u56f0\u60d1\u3002\u8ba9\u6211\u4eec\u8bd5\u7740\u7406\u89e3\u8fd9\u79cd\u56f0\u60d1\u7684\u539f\u56e0\u3002<\/p>\n
    String s1 = \"Java\";\r\n\r\ns1 = \"Python\"; \r\n<\/code><\/pre>\n
    \u5728\u4e0a\u9762\u7684\u4ee3\u7801\u7247\u6bb5\u4e2d\uff0c\u6211\u4eec\u53ef\u80fd\u4f1a\u8ba4\u4e3a s1<\/code> \u7684\u503c\u53d1\u751f\u4e86\u6539\u53d8\uff0c\u5b83\u662f\u4e00\u4e2a String<\/code> \u5bf9\u8c61\u3002\u90a3\u4e48\u6211\u4eec\u5982\u4f55\u8bf4 String<\/code> \u662f\u4e0d\u53ef\u53d8\u7684\u5462\uff1f\u6700\u91cd\u8981\u7684\u4e00\u70b9\u662f\u8981\u7406\u89e3\u5728Java\u4e2d\u5982\u4f55\u521b\u5efa\u5b57\u7b26\u4e32\u3002\u5f53\u6211\u4eec\u4f7f\u7528\u5b57\u7b26\u4e32\u5b57\u9762\u91cf\u521b\u5efa\u4e00\u4e2a\u5b57\u7b26\u4e32\u65f6\uff0c\u5b83\u4e0d\u4f1a\u6539\u53d8\u539f\u59cb\u5b57\u7b26\u4e32\u7684\u503c\u3002\u5b83\u4f1a\u5728\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4e2d\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5b57\u7b26\u4e32\uff0c\u5e76\u6539\u53d8\u53d8\u91cf\u7684\u5f15\u7528\u3002\u56e0\u6b64\uff0c\u539f\u59cb\u5b57\u7b26\u4e32\u7684\u503c\u6c38\u8fdc\u4e0d\u4f1a\u6539\u53d8\uff0c\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48 String<\/code> \u662f\u4e0d\u53ef\u53d8\u7684\u3002\u4e0b\u9762\u7684\u7a0b\u5e8f\u8bc1\u660e\u4e86\u6211\u4eec\u7684\u8bf4\u6cd5\uff0c\u8bf7\u9605\u8bfb\u6ce8\u91ca\u4ee5\u6b63\u786e\u7406\u89e3\u8fd9\u4e2a\u6982\u5ff5\u3002<\/p>\n
    package com.Olivia.java.string;\r\n\r\npublic class StringImmutabilityTest {\r\n\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\tString s1 = \"Java\"; \/\/ \"Java\" \u5b57\u7b26\u4e32\u5728\u5e38\u91cf\u6c60\u4e2d\u521b\u5efa\uff0c\u5e76\u5c06\u5176\u5f15\u7528\u8d4b\u503c\u7ed9 s1\r\n\t\t\r\n\t\tString s2 = s1; \/\/ s2 \u4e5f\u6307\u5411\u5e38\u91cf\u6c60\u4e2d \"Java\" \u7684\u76f8\u540c\u5f15\u7528\r\n\t\t\r\n\t\tSystem.out.println(s1 == s2); \/\/ \u8bc1\u660e s1 \u548c s2 \u5177\u6709\u76f8\u540c\u7684\u5f15\u7528\r\n\t\t\r\n\t\ts1 = \"Python\"; \r\n\t\t\/\/ s1 \u7684\u503c\u5728\u4e0a\u9762\u6539\u53d8\u4e86\uff0c\u90a3\u4e48 String \u600e\u4e48\u8fd8\u662f\u4e0d\u53ef\u53d8\u7684\u5462\uff1f\r\n\t\t\r\n\t\t\/\/ \u5176\u5b9e\uff0c\u5728\u4e0a\u8ff0\u60c5\u51b5\u4e0b\uff0c\u4e00\u4e2a\u65b0\u7684\u5b57\u7b26\u4e32 \"Python\" \u5728\u5e38\u91cf\u6c60\u4e2d\u88ab\u521b\u5efa\u4e86\r\n\t\t\/\/ s1 \u73b0\u5728\u6307\u5411\u5e38\u91cf\u6c60\u4e2d\u7684\u65b0\u5b57\u7b26\u4e32\r\n\t\t\/\/ \u4f46\u662f\uff0c\u539f\u59cb\u5b57\u7b26\u4e32 \"Java\" \u4ecd\u7136\u672a\u88ab\u6539\u53d8\uff0c\u5e76\u4fdd\u7559\u5728\u5e38\u91cf\u6c60\u4e2d\r\n\t\t\/\/ s2 \u4ecd\u7136\u6307\u5411\u5e38\u91cf\u6c60\u4e2d\u7684\u539f\u59cb\u5b57\u7b26\u4e32 \"Java\"\r\n\t\t\r\n\t\t\/\/ \u8bc1\u660e s1 \u548c s2 \u5177\u6709\u4e0d\u540c\u7684\u5f15\u7528\r\n\t\tSystem.out.println(s1 == s2); \r\n\t\t\r\n\t\tSystem.out.println(s2); \r\n\t\t\/\/ \u6253\u5370 \"Java\"\uff0c\u652f\u6301\u539f\u59cb\u5b57\u7b26\u4e32\u503c\u672a\u6539\u53d8\u7684\u4e8b\u5b9e\uff0c\u56e0\u6b64 String \u662f\u4e0d\u53ef\u53d8\u7684\r\n\t\t\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
    \u7f16\u5199\u4e00\u4e2a\u7a0b\u5e8f\u6765\u7edf\u8ba1\u5b57\u7b26\u4e32\u4e2d\u7684\u5355\u8bcd\u6570\u91cf\u3002<\/h3>\n
    \u8fd9\u4e2a\u7a0b\u5e8f\u7684\u7b80\u5355\u89e3\u51b3\u65b9\u6cd5\u4f3c\u4e4e\u662f input.split(\" \").length<\/code>\uff0c\u4f46\u5982\u679c\u60a8\u7684\u5b57\u7b26\u4e32\u683c\u5f0f\u4e0d\u6b63\u786e\uff0c\u5305\u542b\u524d\u5bfc\u548c\u5c3e\u968f\u7a7a\u683c\u3001\u91cd\u590d\u7684\u591a\u4e2a\u7a7a\u683c\u548c\u5236\u8868\u7b26\uff0c\u8fd9\u79cd\u65b9\u6cd5\u5c31\u4e0d\u53ef\u884c\u4e86\u3002\u5e78\u8fd0\u7684\u662f\uff0cString<\/code> \u7684 split()<\/code> \u51fd\u6570\u63a5\u53d7\u6b63\u5219\u8868\u8fbe\u5f0f\u4f5c\u4e3a\u53c2\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u5229\u7528\u5b83\u6765\u8ba1\u7b97\u5b57\u7b26\u4e32\u4e2d\u5355\u8bcd\u7684\u6570\u91cf\u3002<\/p>\n
    \u8fd9\u662f\u6587\u7ae0\u300a\u5728Java\u4e2d\u7f16\u5199\u5b57\u7b26\u4e32\u7a0b\u5e8f\u300b\u7684\u7b2c2\u90e8\u5206\uff08\u51713\u90e8\u5206\uff09\u3002<\/p>\n
    package com.Olivia.java.string;\r\n\r\npublic class CountNumberOfWordsInString {\r\n\tpublic static void main(String[] args) {\r\n\t\tcountNumberOfWords(\"My name is Pankaj\");\r\n\t\tcountNumberOfWords(\"I Love Java Programming\");\r\n\t\tcountNumberOfWords(\" This\tis  not   properly formatted\t\tline \");\r\n\t}\r\n\r\n\tprivate static void countNumberOfWords(String line) {\r\n\t\t\/\/System.out.println(line.split(\" \").length); \/\/won't work with tabs and multiple spaces\r\n\t\tString trimmedLine = line.trim();\r\n\t\tint count = trimmedLine.isEmpty() ? 0 : trimmedLine.split(\"\\\\s+\").length;\r\n\t\tSystem.out.println(count);\r\n\t}\r\n}\r\n<\/code><\/pre>\n
    \u7f16\u5199\u4e00\u4e2a\u7a0b\u5e8f\u6765\u68c0\u67e5\u4e24\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u7531\u76f8\u540c\u7684\u5b57\u7b26\u7ec4\u6210\uff1f<\/h3>\n
    \u9996\u5148\uff0c\u6211\u4eec\u9700\u8981\u4ece\u8f93\u5165\u7684\u5b57\u7b26\u4e32\u4e2d\u521b\u5efa\u5b57\u7b26\u96c6\u5408\u3002\u7136\u540e\uff0c\u4f7f\u7528\u5b57\u7b26\u96c6\u5408\u7684equals()<\/code>\u65b9\u6cd5\u6765\u68c0\u67e5\u5b83\u4eec\u662f\u5426\u5305\u542b\u76f8\u540c\u7684\u5b57\u7b26\u3002\u8fd9\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u7a0b\u5e8f\uff0c\u7528\u4e8e\u68c0\u67e5\u4e24\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u7531\u76f8\u540c\u7684\u5b57\u7b26\u7ec4\u6210\u3002<\/p>\n
    package com.Olivia.java.string;\r\n\r\nimport java.util.Set;\r\nimport java.util.stream.Collectors;\r\n\r\npublic class CheckSameCharsInString {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tsameCharsStrings(\"abc\", \"cba\");\r\n\t\tsameCharsStrings(\"aabbcc\", \"abc\");\r\n\t\tsameCharsStrings(\"abcd\", \"abc\");\r\n\t\tsameCharsStrings(\"11\", \"1122\");\r\n\t\tsameCharsStrings(\"1122\", \"11\");\t\r\n\t}\r\n\r\n\tprivate static void sameCharsStrings(String s1, String s2) {\r\n\r\n\t\tSet<Character> set1 = s1.chars().mapToObj(c -> (char) c).collect(Collectors.toSet());\r\n\t\tSet<Character> set2 = s2.chars().mapToObj(c -> (char) c).collect(Collectors.toSet());\r\n\t\tSystem.out.println(set1.equals(set2));\r\n\t}\r\n}\r\n<\/code><\/pre>\n
    \u8bfb\u53d6\u4e24\u4e2a\u5b57\u7b26\u4e32\u7684\u7528\u6237\u8f93\u5165\uff0c\u5e76\u68c0\u67e5\u7b2c\u4e00\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u5305\u542b\u7b2c\u4e8c\u4e2a\u5b57\u7b26\u4e32\uff1f<\/h3>\n
    \u8fd9\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u7a0b\u5e8f\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528String<\/code>\u7684contains()<\/code>\u65b9\u6cd5\u6765\u68c0\u67e5\u6307\u5b9a\u7684\u5b57\u7b26\u4e32\u662f\u5426\u662f\u8be5\u5b57\u7b26\u4e32\u7684\u4e00\u90e8\u5206\u3002\u7136\u800c\uff0c\u6211\u4eec\u5c06\u9700\u8981\u4f7f\u7528Scanner<\/code>\u7c7b\u6765\u8bfb\u53d6\u7528\u6237\u7684\u8f93\u5165\u3002<\/p>\n
    package com.Olivia.java.string;\r\n\r\nimport java.util.Scanner;\r\n\r\npublic class StringContainsSubstring {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tScanner scanner = new Scanner(System.in);\r\n\t\tSystem.out.println(\"Enter First String:\");\r\n\t\tString s1 = scanner.nextLine();\r\n\t\t\r\n\t\tSystem.out.println(\"Enter Second String:\");\r\n\t\tString s2 = scanner.nextLine();\r\n\t\t\r\n\t\tscanner.close();\r\n\t\t\r\n\t\tboolean result = stringContainsSubstring(s1, s2);\r\n\t\tSystem.out.println(s1+\" contains \"+s2+\" = \"+result);\r\n\t}\r\n\r\n\tprivate static boolean stringContainsSubstring(String string, String substring) {\r\n\t\tboolean result = false;\r\n\t\tresult = string.contains(substring);\r\n\t\treturn result;\r\n\t}\r\n}\r\n<\/code><\/pre>\n
    \u4ee5\u4e0b\u662f\u4e0a\u8ff0\u7a0b\u5e8f\u7684\u6837\u672c\u8f93\u51fa\uff1a<\/p>\n
    Enter First String:\r\nPankaj\r\nEnter Second String:\r\nan\r\nPankaj contains an = true\r\n<\/code><\/pre>\n
    \u5982\u4f55\u5728\u4e0d\u4f7f\u7528\u7b2c\u4e09\u4e2a\u53d8\u91cf\u7684\u60c5\u51b5\u4e0b\u4ea4\u6362\u4e24\u4e2a\u5b57\u7b26\u4e32\uff1f<\/h3>\n
    \u6211\u4eec\u53ef\u4ee5\u4f7f\u7528String<\/code>\u7684substring()<\/code>\u65b9\u6cd5\u6765\u5b9e\u73b0\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u4ee3\u7801\u7247\u6bb5\u6765\u5c55\u793a\u8fd9\u4e00\u70b9\u3002<\/p>\n
    String s1 = \"abc\";\r\nString s2 = \"def\";\r\n\r\ns1 = s1.concat(s2);\r\ns2 = s1.substring(0,s1.length()-s2.length());\r\ns1 = s1.substring(s2.length());\r\n<\/code><\/pre>\n
    \u5982\u679c\u6211\u4eec\u5fc5\u987b\u7f16\u5199\u4e00\u4e2a\u51fd\u6570\u6765\u6267\u884c\u6b64\u64cd\u4f5c\uff0c\u8be5\u600e\u4e48\u529e\uff1f\u7531\u4e8eString<\/code>\u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u65b9\u6cd5\u4e2dString<\/code>\u5f15\u7528\u7684\u503c\u7684\u6539\u53d8\u5c06\u5728\u65b9\u6cd5\u7ed3\u675f\u65f6\u6d88\u5931\u3002\u6b64\u5916\uff0c\u5728Java\u4e2d\uff0c\u6211\u4eec\u65e0\u6cd5\u4ece\u4e00\u4e2a\u65b9\u6cd5\u4e2d\u8fd4\u56de\u591a\u4e2a\u5bf9\u8c61\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u5c06\u4e0d\u5f97\u4e0d\u521b\u5efa\u4e00\u4e2a\u5bb9\u5668\u6765\u5bb9\u7eb3\u8f93\u5165\u7684\u5b57\u7b26\u4e32\uff0c\u7136\u540e\u5728\u65b9\u6cd5\u4e2d\u6267\u884c\u4e0a\u8ff0\u903b\u8f91\u3002\u4e0b\u9762\u7684\u4ee3\u7801\u663e\u793a\u4e86\u5982\u4f55\u5b9e\u73b0\u8fd9\u4e00\u70b9\uff0c\u867d\u7136\u53ef\u80fd\u770b\u8d77\u6765\u590d\u6742\uff0c\u4f46\u903b\u8f91\u4e0e\u4e0a\u9762\u7684\u76f8\u540c\u3002<\/p>\n
    package com.Olivia.java.string;\r\n\r\nimport java.util.Scanner;\r\n\r\npublic class SwapTwoStrings {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\t\r\n\t\tContainer container = new Container();\r\n\t\tScanner scanner = new Scanner(System.in);\r\n\t\tSystem.out.println(\"Enter First String:\");\r\n\t\tcontainer.setFirstString(scanner.nextLine());\r\n\t\t\r\n\t\tSystem.out.println(\"Enter Second String:\");\r\n\t\tcontainer.setSecondString(scanner.nextLine());\r\n\t\tscanner.close();\r\n\t\tSystem.out.println(container);\r\n\t\tcontainer = swapStrings(container);\r\n\t\tSystem.out.println(container);\r\n\t}\r\n\r\n\tprivate static Container swapStrings(Container container) {\r\n\t\tcontainer.setFirstString(container.getFirstString().concat(container.getSecondString())); \/\/s1 = s1+s2\r\n\t\tcontainer.setSecondString(container.getFirstString().substring(0, container.getFirstString().length()-container.getSecondString().length())); \/\/ s2=s1\r\n\t\tcontainer.setFirstString(container.getFirstString().substring(container.getSecondString().length()));\r\n\t\treturn container;\r\n\t}\r\n}\r\n\r\nclass Container{\r\n\tprivate String firstString;\r\n\tprivate String secondString;\r\n\t\r\n\tpublic String getFirstString() {\r\n\t\treturn firstString;\r\n\t}\r\n\tpublic void setFirstString(String firstString) {\r\n\t\tthis.firstString = firstString;\r\n\t}\r\n\tpublic String getSecondString() {\r\n\t\treturn secondString;\r\n\t}\r\n\tpublic void setSecondString(String secondString) {\r\n\t\tthis.secondString = secondString;\r\n\t}\r\n\t\r\n\t@Override\r\n\tpublic String toString() {\r\n\t\treturn \"First String = \"+firstString+\", Second String = \"+secondString;\r\n\t}\r\n}\r\n<\/code><\/pre>\n
    \u793a\u4f8b\u8f93\u51fa\uff1a<\/p>\n
    Enter First String:\r\nJava\r\nEnter Second String:\r\nPython\r\nFirst String = Java, Second String = Python\r\nFirst String = Python, Second String = Java\r\n<\/code><\/pre>\n
    \u7f16\u5199\u4e00\u4e2a\u7a0b\u5e8f\u6765\u67e5\u627e\u8f93\u5165\u5b57\u7b26\u4e32\u4e2d\u7b2c\u4e00\u4e2a\u4e0d\u91cd\u590d\u7684\u5b57\u7b26\u3002<\/h3>\n
    package com.Olivia.java.string;\r\n\r\nimport java.util.ArrayList;\r\nimport java.util.List;\r\n\r\npublic class FindNonRepeatingChar {\r\n\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\tSystem.out.println(printFirstNonRepeatingChar(\"abcaabcdedxy\"));\r\n\t\tSystem.out.println(printFirstNonRepeatingChar(\"abca\"));\r\n\t\tSystem.out.println(printFirstNonRepeatingChar(\"aaa\"));\r\n\r\n\t}\r\n\r\n\tprivate static Character printFirstNonRepeatingChar(String string) {\r\n\t\tchar[] chars = string.toCharArray();\r\n\r\n\t\tList<Character> discardedChars = new ArrayList<>();\r\n\r\n\t\tfor (int i = 0; i < chars.length; i++) {\r\n\t\t\tchar c = chars[i];\r\n\r\n\t\t\tif (discardedChars.contains(c))\r\n\t\t\t\tcontinue;\r\n\r\n\t\t\tfor (int j = i + 1; j < chars.length; j++) {\r\n\t\t\t\tif (c == chars[j]) { \/\/ \u627e\u5230\u5339\u914d\u9879\r\n\t\t\t\t\tdiscardedChars.add(c);\r\n\t\t\t\t\tbreak;\r\n\t\t\t\t} else if (j == chars.length - 1) { \/\/ \u76f4\u5230\u672b\u5c3e\u90fd\u6ca1\u6709\u627e\u5230\u5339\u914d\u9879\r\n\t\t\t\t\treturn c;\r\n\t\t\t\t}\r\n\t\t\t}\r\n\t\t}\r\n\t\treturn null;\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
    \u5982\u4f55\u68c0\u67e5\u5b57\u7b26\u4e32\u662f\u5426\u4ec5\u5305\u542b\u6570\u5b57\uff1f\u63d0\u4f9b\u4e24\u79cd\u65b9\u6cd5\u3002<\/h3>\n
    \u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u6765\u68c0\u67e5\u4e00\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u4e3a\u6570\u5b57\u3002\u53e6\u4e00\u79cd\u65b9\u5f0f\u662f\u5c06\u5176\u89e3\u6790\u4e3a\u957f\u6574\u578b\uff0c\u5982\u679c\u5b83\u662f\u4e00\u4e2a\u975e\u6570\u5b57\u5b57\u7b26\u4e32\uff0c\u5219\u4f1a\u629b\u51faNumberFormatException<\/code>\u5f02\u5e38\u3002<\/p>\n
    package com.Olivia.java.string;\r\n\r\npublic class CheckIfStringContainsDigitsOnly {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tdigitsOnlyString(\"111\");\r\n\t\tdigitsOnlyString(\"111a 1\");\r\n\t\tdigitsOnlyString(\"111 222\");\r\n\t\tdigitsOnlyString(\"111L\");\r\n\r\n\t}\r\n\r\n\tprivate static void digitsOnlyString(String string) {\r\n\t\tif(string.matches(\"\\\\d+\")) System.out.println(\"\u4ec5\u5305\u542b\u6570\u5b57\u7684\u5b57\u7b26\u4e32 ::\"+string);\r\n\t\t\r\n\t\ttry {\r\n\t\t\tlong l = Long.parseLong(string);\r\n\t\t\tSystem.out.println(\"\u4ec5\u5305\u542b\u6570\u5b57\u7684\u5b57\u7b26\u4e32 ::\"+string);\r\n\t\t}catch(Exception e){\r\n\t\t\tSystem.out.println(\"\u4e0d\u5305\u542b\u6570\u5b57\u7684\u5b57\u7b26\u4e32 ::\"+string);\r\n\t\t}\r\n\t\t\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
    \u5982\u4f55\u8fdb\u884c\u5b57\u7b26\u4e32\u7684\u6df1\u62f7\u8d1d\uff1f<\/h3>\n
    \u5b57\u7b26\u4e32\u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u6240\u4ee5\u6211\u4eec\u4e0d\u9700\u8981\u62c5\u5fc3\u6df1\u62f7\u8d1d\u6216\u6d45\u62f7\u8d1d\u3002\u6211\u4eec\u53ef\u4ee5\u7b80\u5355\u5730\u4f7f\u7528\u8d4b\u503c\u64cd\u4f5c\u7b26\uff08=<\/code>\uff09\u5c06\u4e00\u4e2a\u5b57\u7b26\u4e32\u590d\u5236\u5230\u53e6\u4e00\u4e2a\u5b57\u7b26\u4e32\u3002\u8be6\u7ec6\u4fe1\u606f\u8bf7\u9605\u8bfbJava\u5b57\u7b26\u4e32\u590d\u5236\u3002<\/p>\n
    \u4f60\u53ef\u4ee5\u4ece\u6211\u7684GitHub\u4ee3\u7801\u5e93\u4e2d\u4e0b\u8f7d\u8fd9\u4e9b\u793a\u4f8b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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