I have to prepare a .txt file and count how many times each character of alphabet occurs in the file. I've found a very nice piece of code, but unfortunately, it doesn't work with Polish characters like ą,ę,ć,ó,ż,ź. Even though I put them in the array, for some reason they are not found in the .txt file so the output is 0.
Does anyone know why? Maybe I should count them differently, with "Switch" or something similar. Before anyone asks - yes, the .txt file is saved with UTF-8 :)
public static void main(String[] args) throws FileNotFoundException {
int ch;
BufferedReader reader;
try {
int counter = 0;
for (char a : "AĄĆĘÓBCDEFGHIJKLMNOPQRSTUVWXYZ".toCharArray()) {
reader = new BufferedReader(new FileReader("C:\\Users\\User\\Desktop\\pan.txt"));
char toSearch = a;
counter = 0;
try {
while ((ch = reader.read()) != -1) {
if (a == Character.toUpperCase((char) ch)) {
counter++;
}
}
} catch (IOException e) {
System.out.println("Error");
e.printStackTrace();
}
System.out.println(toSearch + " occurs " + counter);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
Looks like your problem related to encoding and default system charset
try to change reader variable to this
InputStreamReader reader = new InputStreamReader(new FileInputStream("C:\\Users\\User\\Desktop\\pan.txt"), "UTF-8");
try this: I suggest that you use NIO and this code I have written for you using NIO, RandomAccessFile and MappedByteBuffer that is faster:
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.util.HashMap;
import java.util.Map;
public class FileReadNio
{
public static void main(String[] args) throws IOException
{
Map<Character, Integer> charCountMap = new HashMap<>();
RandomAccessFile rndFile = new RandomAccessFile
("c:\\test123.txt", "r");
FileChannel inChannel = rndFile.getChannel();
MappedByteBuffer buffer = inChannel.map(FileChannel.MapMode.READ_ONLY, 0, inChannel.size());
buffer.load();
for (int i = 0; i < buffer.limit(); i++)
{
char c = (char) buffer.get();
if (charCountMap.get(c) != null) {
int cnt = charCountMap.get(c);
charCountMap.put(c, ++cnt);
}
else
{
charCountMap.put(c, 1);
}
}
for (Map.Entry<Character,Integer> characterIntegerEntry : charCountMap.entrySet()) {
System.out.printf("char: %s :: count=%d", characterIntegerEntry.getKey(), characterIntegerEntry.getValue());
System.out.println();
}
buffer.clear();
inChannel.close();
rndFile.close();
}
}
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.