ex7_5.java

判断三角形

//7.5 统计字符串中字母的个数
public class Ex7_5{
  public static void main (String[] args) {
     String str="SSN is 343 32 4545 an ID is 434 34 4323";
     int[] countofstr=count(str);
     for(int i=0;i<=9;i++)
     System.out.println(i+"的次数为："+countofstr[i]);
  }
  public static int[] count (String s){
  	 int[] countofnum=new int[10];
     for(int i=0;i<s.length();i++){
       if(s.charAt(i)<=57&&s.charAt(i)>=48){
       int j=s.charAt(i);
       countofnum[j-48]++;//利用数字的ASCII码值确定对应下标
       }
     }
     return countofnum;
  }
}