Initial data commit

Task/Letter-frequency/Java/letter-frequency-4.java

@@ -0,0 +1,15 @@
+public static int[] countLetters(String filename) throws IOException{
+	int[] freqs = new int[26];
+	try(BufferedReader in = new BufferedReader(new FileReader(filename))){
+		String line;
+		while((line = in.readLine()) != null){
+			line = line.toUpperCase();
+			for(char ch:line.toCharArray()){
+				if(Character.isLetter(ch)){
+					freqs[ch - 'A']++;
+				}
+			}
+		}
+	}
+	return freqs;
+}