exercise7_5.java

Introduction to java programming 一书中所有编程练习部分的源码

public class Exercise7_5 {
  public static void main(String[] args) {
    int[] counts = count("SSN is 343 32 4545 and ID is 434 34 4323");

    for (int i = 0; i < 10; i++)
      System.out.println(i + " " + counts[i]);
  }

  public static int[] count(String s) {
    int[] counts = new int[10];

    for (int i = 0; i < s.length(); i++) {
      if (Character.isDigit(s.charAt(i)))
        counts[s.charAt(i) - '0']++;
    }

    return counts;
  }
}