Java 车牌号信息统计：数量、结尾数字和包含数字 '4' 的车牌

public class CarPlateNumber {
    public static void main(String[] args) {
        String[] carPlateNumbers = {
                '豫U·4C01H', '豫N·NQ560', '豫N·A8F47', '豫Q·3F54E', '豫P·938MQ', '豫B·970EH', '豫K·Z13L0',
                '豫F·1Y93H', '豫J·677SU', '豫E·6CK75', '豫K·47HC3', '豫A·Q9L13', '豫B·906EK', '豫E·DK598',
                '豫K·7QG44', '豫J·07F5M', '豫D·4EM64', '豫L·211BC', '豫G·C3Y18', '豫Q·ST782', '豫A·EA559',
                '豫A·E8N37', '豫J·8Y42P', '豫N·1D3R5', '豫L·UJ665', '豫J·8HD22', '豫K·SC715', '豫E·481WL',
                '豫N·2TC74', '豫M·JS069', '豫U·960RQ', '豫B·Y8R01', '豫F·72QH5', '豫M·718XE', '豫E·39US8',
                '豫K·460WE', '豫B·9L09Z', '豫E·63TN9', '豫P·QH098', '豫J·Y73C8', '豫U·GB860', '豫K·X4P67',
                '豫C·XC178', '豫L·V74W5', '豫N·FV022', '豫G·116JA', '豫U·563FS', '豫E·YS027', '豫N·8MQ39',
                '豫B·FS291', '豫B·363PQ', '豫G·V0U30', '豫J·09BQ1', '豫J·DY503'
        };

        // 统计车牌号总数
        int total = carPlateNumbers.length;
        System.out.println('总共有' + total + '个车牌号');

        // 统计以数字结尾的车牌号数量
        int endsWithNumber = 0;
        for (String carPlateNumber : carPlateNumbers) {
            if (Character.isDigit(carPlateNumber.charAt(carPlateNumber.length() - 1))) {
                endsWithNumber++;
            }
        }
        System.out.println('以数字结尾的车牌号有' + endsWithNumber + '个');

        // 统计带4的车牌号数量
        int contains4 = 0;
        for (String carPlateNumber : carPlateNumbers) {
            if (carPlateNumber.contains('4')) {
                contains4++;
            }
        }
        System.out.println('带4的车牌号有' + contains4 + '个');
    }
}