用Java寫壹個程序，從文件（c:\test.txt）中查出字符串”mobnet”出現的次數？

import java.io.FileReader;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class TxtCount {

/**

* @param args

*/

public static void main(String[] args) throws Exception {

BufferedReader br = new BufferedReader(new FileReader("C:\\test.txt"));

StringBuilder sb = new StringBuilder();

while (true) {

String str = br.readLine();

if (str == null)

break;

sb.append(str);

}

Pattern p = Pattern.compile("mobnet");

Matcher m = p.matcher(sb);

int count = 0;

while(m.find()) {

count++;

}

System.out.println("mobnet壹***出現了" + count + "次");

}

}