java：算法 - 统计字符

题目：输入一行字符，分别统计出其中英文字母、空格、数字和其它字符的个数。
程序分析：使用String.matches（regex）来判断字符串中每个字符的种类

/*
   *given a input of String, count statistics.
   *the return array of 2 dimension gives such statistics as
   * the total number of Chinese chars, English chars
   * followed by that of blank space, numbers and other chars
   */
  public static String[][] getComp(String str){
    //a table with 5 rows and 2 columns
    String[][] comp = new String[5][2];
    //type of chars
    comp[0][0] = "Chinese chars";
    comp[1][0] = "English chars";
    comp[2][0] = "Blank space";
    comp[3][0] = "Numbers";
    comp[4][0] = "Other chars";
    //statics to be filled
    int countChinese = 0;
    int countEnglish = 0;
    int countNumber = 0;
    int countSpace = 0;
    int countOther = 0;
    char[] arrayChar = str.toCharArray();
    String[] arrayString = new String[str.length()];
    for(int i=0;i<str.length();i++)
      arrayString[i] = str.valueOf(arrayChar[i]);
    for(String s:arrayString){
      if(s.matches("[\u4e00-\u9fa5]"))
        countChinese++;
      else if(s.matches("[a-zA-Z]"))
        countEnglish++;
      else if(s.matches("[0-9]"))
        countNumber++;
      else if(s.matches("\\s"))
        countSpace++;
      else
        countOther++;
    }
    comp[0][1] = String.valueOf(countChinese);
    comp[1][1] = String.valueOf(countEnglish);
    comp[2][1] = String.valueOf(countSpace);
    comp[3][1] = String.valueOf(countNumber);
    comp[4][1] = String.valueOf(countOther);

    return comp;
  }

测试：

public static void main(String[] args){
    String[][] str = StringComp.getComp("大世界1234 h e y @#!");
    StringBuffer strBfr = new StringBuffer();
    for(int i=0;i<str.length;i++){
      for(int j=0;j<str[i].length;j++){
        strBfr.append(str[i][j]+" ");
      }
      strBfr.append("\n");
    }
    System.out.println(strBfr);
	}

输出：

Chinese chars 3
English chars 3
Blank space 4
Numbers 4
Other chars 3