Example of java file operation code fragment to realize the function of counting the number of letters appearing in the file

Copy the code code as follows:

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++) {

// if it is a letter

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

i++;

// if it is a number

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

j++;

// is a space

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

f++;

}

line = in.readLine();

k++;

}

in.close();

System.out

.println("Letters: " + i + ", Numbers: " + j + ", Spaces: " + f + ", Number of lines: " + k);

} catch (IOException e) {

e.printStackTrace();

}