Initial data commit

Task/Letter-frequency/Java/letter-frequency-1.java

@@ -0,0 +1,5 @@
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.HashMap;
+import java.util.Map;

Task/Letter-frequency/Java/letter-frequency-2.java

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+public static void main(String[] args) throws IOException {
+    Map<Integer, Integer> frequencies = frequencies("src/LetterFrequency.java");
+    System.out.println(print(frequencies));
+}
+
+static String print(Map<Integer, Integer> frequencies) {
+    StringBuilder string = new StringBuilder();
+    int key;
+    for (Map.Entry<Integer, Integer> entry : frequencies.entrySet()) {
+        key = entry.getKey();
+        string.append("%,-8d".formatted(entry.getValue()));
+        /* display the hexadecimal value for non-printable characters */
+        if ((key >= 0 && key < 32) || key == 127) {
+            string.append("%02x%n".formatted(key));
+        } else {
+            string.append("%s%n".formatted((char) key));
+        }
+    }
+    return string.toString();
+}
+
+static Map<Integer, Integer> frequencies(String path) throws IOException {
+    try (InputStreamReader reader = new InputStreamReader(new FileInputStream(path))) {
+        /* key = character, and value = occurrences */
+        Map<Integer, Integer> map = new HashMap<>();
+        int value;
+        while ((value = reader.read()) != -1) {
+            if (map.containsKey(value)) {
+                map.put(value, map.get(value) + 1);
+            } else {
+                map.put(value, 1);
+            }
+        }
+        return map;
+    }
+}

Task/Letter-frequency/Java/letter-frequency-3.java

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+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.Arrays;
+
+public class LetterFreq {
+	public static int[] countLetters(String filename) throws IOException{
+		int[] freqs = new int[26];
+		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']++;
+				}
+			}
+		}
+		in.close();
+		return freqs;
+	}
+	
+	public static void main(String[] args) throws IOException{
+		System.out.println(Arrays.toString(countLetters("filename.txt")));
+	}
+}

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

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+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;
+}

Task/Letter-frequency/Java/letter-frequency-5.java

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+public static Map<Integer, Long> countLetters(String filename) throws IOException {
+    return Files.lines(Paths.get(filename))
+        .flatMapToInt(String::chars)
+        .filter(Character::isLetter)
+        .boxed()
+        .collect(Collectors.groupingBy(Function.identity(), Collectors.counting()));
+}