ExamScore

package june22;

import java.util.Map;
import java.util.Scanner;
import java.util.TreeMap;

import javax.xml.crypto.dsig.keyinfo.KeyValue;

public class ExamResults {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        for (int i = 0; i < 3; i++) {
            input.nextLine();
        }
        TreeMap<Integer, TreeMap<String, Double>> mapmap = new TreeMap<>();

        while (true) {
            String nextStudent = input.nextLine();
            if (nextStudent.contains("-")) {
                break;
            }
            String[] container = nextStudent.split("[^a-zA-Z0-9.]+");
            String name = container[1] + " " + container[2];
            int score = Integer.parseInt(container[3]);
            double mark = Double.parseDouble(container[4]);

            double tempValue = 0.0;

            if (mapmap.get(score) == null) {
                mapmap.put(score, new TreeMap<>());
                mapmap.get(score).put(name, mark);
            }
            else {
                if (mapmap.get(score).get(name) == null) {
                    mapmap.get(score).put(name, mark);
                }
                else {
                    tempValue = mapmap.get(score).get(name) + mark;
                    mapmap.get(score).put(name, tempValue);
                }
            }
        }

        for (Map.Entry<Integer, TreeMap<String, Double>> p : mapmap.entrySet()) {
            System.out.print(p.getKey() + " -> ");

            Map<String, Double> temp = p.getValue();
            String output = temp.toString().replaceAll("[(=0-9.0-2+)]", "").replace('{', '[').replace('}', ']');
            System.out.print(output);
            double sum = 0.0;
            int size = 0;
            for (Map.Entry<String, Double> k : temp.entrySet()) {
                double current = k.getValue();
                sum += current;
                size++;
            }

            System.out.printf("; avg=%.2f\n", sum / size);
        }
    }

}