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What are the methods to determine whether a string contains Chinese characters or characters in Java?

王林
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2019-11-27 16:39:48 6640browse

What are the methods to determine whether a string contains Chinese characters or characters in Java?

判断中文字符(包括中文汉字和中文符号)

(1)使用中文的编码区间来判断(推荐,效率高)

String str1 = "T恤;https://blog.csdn.net/vpqtxzmzezeqjj9977";//中文汉字 String str2 = ";https://blog.csdn.net/vpqtxzmzezeqjj9977";//中文分号 String str3 = "https://blog.csdn.net/vpqtxzmzezeqjj9977";//英文 int flage = 0; for (char c : str2.toCharArray()) { if (c >= 0x4E00 && c <= 0x9FA5){ flage = 1; System.out.println("发现中文字符:"+c); break; //有一个中文字符就返回 } } if(flage!=1){ System.out.println("恭喜,没有发现中文字符!"); }

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(2)使用正则表达式来判断(不推荐,效率低,需要遍历整个字符串)

for (int i = 0; i < str1.length(); i++) { if (str.substring(i, i + 1).matches("[\\u4e00-\\u9fbb]+")) { flage = 1; System.out.println("发现中文字符:"+str.substring(i, i + 1)); break; //有一个中文字符就返回 } } if(flage!=1){ System.out.println("恭喜,没有发现中文字符!"); }

(3)使用Unicode编码来判断中文标点(推荐)

// GENERAL_PUNCTUATION 判断中文的“号 // CJK_SYMBOLS_AND_PUNCTUATION 判断中文的。号 // HALFWIDTH_AND_FULLWIDTH_FORMS 判断中文的,号 private static final boolean isChinese(char c) { Character.UnicodeBlock ub = Character.UnicodeBlock.of(c); if (ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS || ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS || ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A || ub == Character.UnicodeBlock.GENERAL_PUNCTUATION || ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION || ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS) { return true; } return false; }

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