java文件操作代码片断实例实现统计文件中字母出现的个数功能

复制代码代码如下:

String fileName = "D:/date.java.bak";

// String fileName = "D:/test.qqq";

String line;

int i = 0, j = 0, f = 0, k = 0;

try {

BufferedReader in = new BufferedReader(new FileReader(fileName));

line = in.readLine();

while (line != null) {

// System.out.println(line);

char c[] = line.toCharArray();

for (int i1 = 0; i1 < c.length; i1++) {

// 如果是字母

if (Character.isLetter(c[i1]))

i++;

// 如果是数字

else if (Character.isDigit(c[i1]))

j++;

// 是空格

else if (Character.isWhitespace(c[i1]))

f++;

}

line = in.readLine();

k++;

}

in.close();

System.out

.println("字母:" + i + ",数字:" + j + ",空格:" + f + ",行数:" + k);

} catch (IOException e) {

e.printStackTrace();

}