package test;

public class Stringclass {

    public static void main(String[] args) {

        String s="AHGSASGVAjgahASHGBSAHAGagd*((";

        int xiaoxienumber=;

        int daxienumber=;

        int other=;

        for(int i=;i<s.length();i++) {

           char z=s.charAt(i);

            if(Character.isLowerCase(z)) {

                xiaoxienumber++;

            }else if(Character.isUpperCase(z)) {

                daxienumber++    ;

            }else{

               other++ ;

            }

        }

        System.out.println("在这段字符串中，大写字母有"+xiaoxienumber+"小写字母有"+daxienumber+"其他有"+other);

   }

}

package test;

public class Stringclass2 {

 public static void main(String[] args) {

     String s="java32432443javasdkfhukewfhjavaekjwhfewiuehjava";

     String find="java";

     int number=;

     int index=-;

     while((index=s.indexOf(find))!=-) {

         s=s.substring(index+find.length());

         number++;

     }

     System.out.println("字符串含JAVA的个数为"+number);

 }

}