JAVA 统计字符串中中文，英文，数字，空格，特殊字符的个数

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引言

可以根据各种字符在Unicode字符编码表中的区间来进行判断，如数字为'0'~'9'之间，英文字母为'a'~'z'或'A'~'Z'等，Java判断一个字符串是否有中文是利用Unicode编码来判断，因为中文的编码区间为：0x4e00--0x9fbb，但通用区间来判断中文也不非常精确，因为有些中文的标点符号利用区间判断会得到错误的结果。所以通过Character.UnicodeBlock来进行判断。代码如下：

package cn.csrc.base.count;
public class CountCharacter {
public static void main(String[] args) {String str ="我爱你abcd123中国 #!";
CountCharacter countCharacter = new CountCharacter();
countCharacter.count(str);
} /**中文字符 */
private int chCharacter = 0; /**英文字符 */
private int enCharacter = 0; /**空格 */
private int spaceCharacter = 0; /**数字 */
private int numberCharacter = 0; /**其他字符 */
private int otherCharacter = 0; //记录中文字符
private StringBuilder sb1=new StringBuilder(); //记录英文字符
private StringBuilder sb2=new StringBuilder(); //记录数字
private StringBuilder sb3=new StringBuilder(); //记录特殊字符
private StringBuilder sb4=new StringBuilder(); /***
* 统计字符串中中文，英文，数字，空格等字符个数
* @param str 需要统计的字符串
*/
public void count(String str) {
if(str.equals("") || str==null){
System.out.println("字符串为空");
return;
}
for (int i = 0; i < str.length(); i++) {
char tmp = str.charAt(i);
if ((tmp >= 'A' && tmp <= 'Z') || (tmp >= 'a' && tmp <= 'z')) {
enCharacter ++;
sb2.append(tmp+" ");
} else if ((tmp >= '') && (tmp <= '')) {
numberCharacter ++;
sb3.append(tmp +" ");
} else if (tmp ==' ') {
spaceCharacter ++;
} else if (isChinese(tmp)) {
chCharacter ++;
sb1.append(tmp+" ");
} else {
otherCharacter ++;
sb4.append(tmp +" ");
}
}
System.out.println("字符串:" + str + " \r\n");
System.out.println("中文字符有:" + chCharacter +"个 ("+sb1.toString()+")");
System.out.println("英文字符有:" + enCharacter +"个 ("+sb2.toString()+")");
System.out.println("数字有:" + numberCharacter+"个 ("+sb3.toString()+")");
System.out.println("空格有:" + spaceCharacter+"个");
System.out.println("其他字符有:" + otherCharacter+"个 ("+sb4.toString()+")");
} /***
* 判断字符是否为中文
* @param ch 需要判断的字符
* @return 中文返回true，非中文返回false
*/
private boolean isChinese(char ch) {
//获取此字符的UniCodeBlock
Character.UnicodeBlock ub = Character.UnicodeBlock.of(ch);
// GENERAL_PUNCTUATION 判断中文的“号
// CJK_SYMBOLS_AND_PUNCTUATION 判断中文的。号
if (ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS || ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS
|| ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A || ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_B
|| ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION || ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS
|| ub == Character.UnicodeBlock.GENERAL_PUNCTUATION) {
System.out.println(ch + " 是中文");
//sb1.append(ch+" ");
return true;
}
return false;

}
}