BOTS/src/Praktikum4/SorterServer.java

package Praktikum4;


import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.HashMap;
import java.util.Map;

public class SorterServer implements Runnable {
    public static void main(String[] args) {
        final int port = 12345;
        try (ServerSocket socket = new ServerSocket(port)) {
            while (true) {
                Socket client = socket.accept();
                Thread thread = new Thread(new SorterServer(client));
                thread.start();
            }
        } catch (Exception e) {
            System.err.println("Error: " + e.getMessage());
        }
    }

    private Socket socket;

    private SorterServer(Socket socket) {
        this.socket = socket;
    }

    @Override
    public void run() {
        try {
            String msg = receiveLine(this.socket);
            String ausgabe=sortAndCount(msg);
            sendLine(socket,ausgabe );
        }
        catch (Exception e) {};
    }


    public static String receiveLine(Socket socket) throws IOException {
        InputStream in = socket.getInputStream();
        BufferedReader reader = new BufferedReader(new InputStreamReader(in));
        return reader.readLine();
    }

    public static void sendLine(Socket socket, String line) throws IOException {
        OutputStream out = socket.getOutputStream();
        PrintWriter writer = new PrintWriter(out);
        writer.println(line);
        writer.flush();
    }

    public static String sortAndCount(String input) {

        Map<Character, Integer> charCountMap = new HashMap<>();


        for (char c : input.toCharArray()) {
            charCountMap.put(c, charCountMap.getOrDefault(c, 0) + 1);
        }


        StringBuilder sortedString = new StringBuilder();


        for (char c = 'a'; c <= 'z'; c++) {

            if (charCountMap.containsKey(c)) {
                int count = charCountMap.get(c);
                for (int i = 0; i < count; i++) {
                    sortedString.append(c);
                }
            }
        }

        // Rückgabe der sortierten Zeichenkette
        return sortedString.toString();
    }
}