別人發的一個題目：

  java上機實現統計D://document/file.txt檔案中出現的字母個數、數字個數、漢字個數、空格個數及行數？

 自己實現了下：

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 *  java實現統計D:/aa.txt檔案中出現的字母個數、數字個數、漢字個數、空格個數及行數
 *
 */
public class StatisticalCharacters {

	/**
	 * @param args
	 * @throws FileNotFoundException 
	 */
	public static void main(String[] args) throws FileNotFoundException {
		String name = "D:/aa.txt"; //檔名  
		int num = 0;      //數字數  
		int letter = 0;    //字母數  
		int line = 0;    //行數  
		int space = 0;  //空格數  
		int word= 0;  //漢字數
		try{
		
			File file=new File(name);
			BufferedReader br= new BufferedReader(new FileReader(file));
			String str = null;
			
			while((str=br.readLine())!=null){
				System.out.println(str);
				line++;
			    num += countNumber(str);
				letter += countLetter(str);
				word += countChinese(str);
				space += countSpace(str);
			}
		
		}catch(Exception e){
			e.printStackTrace();
		}

		System.out.println("數字數："+num);
		System.out.println("字母數"+letter);
		System.out.println("漢字數"+word);
		System.out.println("空格數"+space);
    	System.out.println("行數"+line);
	}
	
	/**
	 * 統計數字數
	 * @param str
	 * @return
	 */
	public static int countNumber(String str) {
        int count = 0;
        Pattern p = Pattern.compile("\\d");
        Matcher m = p.matcher(str);
        while(m.find()){
            count++;
        }
        return count;
    }

	/**
	 * 統計字母數
	 * @param str
	 * @return
	 */
    public static int countLetter(String str) {
        int count = 0;
        Pattern p = Pattern.compile("[a-zA-Z]");
        Matcher m = p.matcher(str);
        while(m.find()){
            count++;
        }
        return count;
    }

    /**
     * 統計漢字數
     * @param str
     * @return
     */
    public static int countChinese(String str) {
        int count = 0;
        Pattern p = Pattern.compile("[\\u4e00-\\u9fa5]");
        Matcher m = p.matcher(str);
        while(m.find()){
            count++;
        }
        return count;
    }
    
    /**
     * 統計空格數
     * @param str
     * @return
     */
    public static int countSpace(String str) {
        int count = 0;
        Pattern p = Pattern.compile("\\s");
        Matcher m = p.matcher(str);
        while(m.find()){
            count++;
        }
        return count;
    }
    

}