Question

java 怎么判断字母大小写，数字和其他字符的

Answer 1

  publicstatic void main(String[] args)
       {
              String str = "abAM1,!23";
              int cntU = 0; //大写字母的个数
              int cntL = 0; //小写字母的个数
              int cntOther = 0;
              int i;
    
              String s1 = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
              String s2 ="abcdefghijklmnopqrstuvwxyz";
              for (i=0; i<str.length(); ++i)
              {
                     charch = str.charAt(i);
  
                     if(-1 != (s1.indexOf(ch)))
                     {
                            cntU++;
                     }
                     elseif (-1 != s2.indexOf(ch))
                     {
                            cntL++;
                     }
                     else
                     {
                            cntOther++;
                     }
              }
System.out.printf("大写字母个数: %d\n", cntU);
              System.out.printf("小写字母个数: %d\n", cntL);
              System.out.printf("非字母个数: %d\n", cntOther);

}