JAVA 求中文首字母（大小写）

た入场券 2022-08-23 00:53 190阅读 0赞

### 从别地方淘来的代码，经测试可用 ###

public class ChinaInitial {
        
    
        /**
         * 测试代码
         * 
         * @param args
         */
    
        public static void main(String[] args) {
    
            String str = "精英班1401";
    
            System.out.println("中文首字母：" + getPYIndexStr(str, false));
            //第二个参数为是否大写
    
        }
    
        /**
         * 
         * 返回首字母
         * 
         * @param strChinese
         * 
         * @param bUpCase
         * 
         * @return
         */
    
        public static String getPYIndexStr(String strChinese, boolean bUpCase) {
    
            try {
                StringBuffer buffer = new StringBuffer();
                byte b[] = strChinese.getBytes("GBK");// 把中文转化成byte数组
                for (int i = 0; i < b.length; i++) {
                    if ((b[i] & 255) > 128) {
                        int char1 = b[i++] & 255;
                        char1 <<= 8;// 左移运算符用“<<”表示，是将运算符左边的对象，向左移动运算符右边指定的位数，并且在低位补零。其实，向左移n位，就相当于乘上2的n次方
                        int chart = char1 + (b[i] & 255);
                        buffer.append(getPYIndexChar((char) chart, bUpCase));
                        continue;
                    }
                    char c = (char) b[i];
                    if (!Character.isJavaIdentifierPart(c))// 确定指定字符是否可以是 Java
                                                            // 标识符中首字符以外的部分。
                        c = 'A';
                    buffer.append(c);
    
                }
    
                return buffer.toString();
    
            } catch (Exception e) {
                System.out.println((new StringBuilder())
                        .append("\u53D6\u4E2D\u6587\u62FC\u97F3\u6709\u9519")
                        .append(e.getMessage()).toString());
            }
            return null;
        }
    
        /**
         * 
         * 得到首字母
         * 
         * @param strChinese
         * 
         * @param bUpCase
         * 
         * @return
         */
    
        private static char getPYIndexChar(char strChinese, boolean bUpCase) {
            int charGBK = strChinese;
            char result;
            if (charGBK >= 45217 && charGBK <= 45252)
                result = 'A';
            else if (charGBK >= 45253 && charGBK <= 45760)
                result = 'B';
            else if (charGBK >= 45761 && charGBK <= 46317)
                result = 'C';
            else if (charGBK >= 46318 && charGBK <= 46825)
                result = 'D';
            else if (charGBK >= 46826 && charGBK <= 47009)
                result = 'E';
            else if (charGBK >= 47010 && charGBK <= 47296)
                result = 'F';
            else if (charGBK >= 47297 && charGBK <= 47613)
                result = 'G';
            else if (charGBK >= 47614 && charGBK <= 48118)
                result = 'H';
            else if (charGBK >= 48119 && charGBK <= 49061)
                result = 'J';
            else if (charGBK >= 49062 && charGBK <= 49323)
                result = 'K';
            else if (charGBK >= 49324 && charGBK <= 49895)
                result = 'L';
            else if (charGBK >= 49896 && charGBK <= 50370)
                result = 'M';
            else if (charGBK >= 50371 && charGBK <= 50613)
                result = 'N';
            else if (charGBK >= 50614 && charGBK <= 50621)
                result = 'O';
            else if (charGBK >= 50622 && charGBK <= 50905)
                result = 'P';
            else if (charGBK >= 50906 && charGBK <= 51386)
                result = 'Q';
            else if (charGBK >= 51387 && charGBK <= 51445)
                result = 'R';
            else if (charGBK >= 51446 && charGBK <= 52217)
                result = 'S';
            else if (charGBK >= 52218 && charGBK <= 52697)
                result = 'T';
            else if (charGBK >= 52698 && charGBK <= 52979)
                result = 'W';
            else if (charGBK >= 52980 && charGBK <= 53688)
                result = 'X';
            else if (charGBK >= 53689 && charGBK <= 54480)
                result = 'Y';
            else if (charGBK >= 54481 && charGBK <= 55289)
                result = 'Z';
            else
                result = (char) (65 + (new Random()).nextInt(25));
            if (!bUpCase)
                result = Character.toLowerCase(result);
            return result;
    
        }
    
    }