public class TestSubstring {
  public static void main(String[] args) {
    getCount("adsJKJ3K21AfaAD134F13241d134134s141faAAFDF");
  }
  //統(tǒng)計字符串中，大寫字母，小寫字母，數(shù)字出現(xiàn)的次數(shù)
  public static void getCount(String str) {
    int upper = 0;
    int lower = 0;
    int digi = 0;
    for (int i = 0, len = str.length(); i < len; i++) {
      char c = str.charAt(i);
      if (c >= 'A' && c <= 'Z') {
        upper++;
      } else if (c >= 'a' && c <= 'z') {
        lower++;
      } else if (c >= '0' && c <= '9') {
        digi++;
      }
    }
    System.out.println("大寫字母:" + upper); //大寫字母:13
    System.out.println("小寫字母:" + lower); //小寫字母:9
    System.out.println("數(shù)字:" + digi);   //數(shù)字:20
  }
}