Java 判断中文字符

Java判断一个字符串中是否有中文字符有两种方法，但是原理都一样，就是通过Unicode编码来判断，因为中文在Unicode中的编码区间为：0x4e00--0x9fa5

第一种：

[java]
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String chineseStr = "中华人民公社abc";
char[] charArray = chineseStr.toCharArray();
for(int i=0;i<charArray.length;i++){
if ((charArray[i] >= 0x4e00)&&(charArray[i] <= 0x9fa5)){
System.out.println(charArray[i]);
}
}

String chineseStr = "中华人民公社abc";
char[] charArray = chineseStr.toCharArray();
for(int i=0;i<charArray.length;i++){
if ((charArray[i] >= 0x4e00)&&(charArray[i] <= 0x9fa5)){
System.out.println(charArray[i]);
}
}

第二种：

[java]
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String str = "中国chinese";
for (int i = 0; i < str.length(); i++) {
System.out.println(str.substring(i, i + 1).matches("[\\u4e00-\\u9fa5]+"));
}

String str = "中国chinese";
for (int i = 0; i < str.length(); i++) {
System.out.println(str.substring(i, i + 1).matches("[\\u4e00-\\u9fa5]+"));
}

第三种：

[java]
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public class IsChineseOrEnglish {
// 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

public static 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;
}

public static void isChinese(String strName) {
char[] ch = strName.toCharArray();
for (int i = 0; i < ch.length; i++) {
char c = ch[i];
if (isChinese(c) == true) {
System.out.println(isChinese(c));
return;
} else {
System.out.println(isChinese(c));
return;
}
}
}

public static void main(String[] args) {
// Random r = new Random();
// for (int i = 0; i < 20; i++)
// System.out.println(r.nextInt(10) + 1);
isChinese("き");
isChinese("中国");
}
}