1.判斷字符串是否全為漢字

String str1 = "java判斷是否為漢字"String str2 = "全為漢字"String reg = "[\\u4e00-\\u9fa5]+"boolean result1 = str1.matches(reg)//falseboolean result2 = str2.matches(reg)//true

2.提取字符串中的漢字

String str = "java怎么把a(bǔ)sdasd字符串中的asdasd的漢字取出來";String reg = "[^\u4e00-\u9fa5]";str = str.replaceAll(reg, " ");System.out.println(str);

3.判斷字符串中是否含有漢字

boolean result = (str.length() == str.getBytes().length)//true:無漢字 false:有漢 字

4.獲取字符串中漢字的個數(shù)

int count = 0;String reg = "[\\u4e00-\\u9fa5]";String str = "java獲取漢字Chinese的個數(shù)";Pattern p = Pattern.compile(reg);Matcher m = p.matcher(str);while (m.find()) {for (int i = 0; i <= m.groupCount(); i++) {count = count + 1;}}System.out.println("共有漢字 " + count + "個 ");

java一般的中文判斷都是利用正則表達(dá)式
（1）Pattern pattern = Pattern.compile("[\u4e00-\u9fcc]+");
（2）System.out.println(pattern.matcher(str).find());
或者

System.out.println(str.matches("[\u4e00-\u9fcc]+"));

5、 在Java中，主要使用 Character類處理字符有關(guān)功能，這里使用它提供的內(nèi)部類來判斷中文
（1）.Character.UnicodeBlock
判斷漢字：

private static boolean isChineseByBlock(char c) {Character.UnicodeBlock ub = Character.UnicodeBlock.of(c);if (ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS|| ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A|| ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_B|| ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_C//jdk1.7|| ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_D//jdk1.7|| ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS|| ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS_SUPPLEMENT) {return true;}return false;}

判斷中文符號：

private static boolean isChinesePuctuation(char c) { Character.UnicodeBlock ub = Character.UnicodeBlock.of(c); if (ub == Character.UnicodeBlock.GENERAL_PUNCTUATION || ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION || ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS || ub == Character.UnicodeBlock.CJK_COMPATIBILITY_FORMS || ub == Character.UnicodeBlock.VERTICAL_FORMS) {//jdk1.7 return true; } return false; }

（2）.Character.UnicodeScript（jdk1.7才提供）
Character.UnicodeScript提供了更為簡潔的判斷漢字的方式：

private static boolean isChineseByScript(char c) { Character.UnicodeScript sc = Character.UnicodeScript.of(c); if (sc == Character.UnicodeScript.HAN) { return true; } return false; }

示例：編寫一個截取字符串的方法， 輸入為一個字符串和字節(jié)數(shù)，輸出為按字節(jié)數(shù)截
取的字符串。 但是要保證漢字不被截半個，如"我ABC"4，應(yīng)該截為"我AB"，輸入"我
ABC漢DEF"6， 應(yīng)該輸出為"我ABC"而不是"我ABC+漢的半個"。

public class TestString { public static String SubStr(String str,int start,int length) throws Exception{byte[] bytes = str.getBytes("Unicode");System.out.println(bytes.length);int z=start=2*start+2;int n=0,count=0;for(;start<bytes.length&&n<length;n++,start++){if(bytes[start] == 0){n--;}count++;}System.out.println(start+" "+count+" "+n);if (count % 2 == 1) {if (bytes[count - 1] != 0) {count--;} else if (bytes[count - 1] == 0) {count++;}}return new String(bytes, z, count, "Unicode");}public static void main(String[] args) throws Exception {System.out.println(SubStr("我Abc",0,2));} }

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