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hashMaps.java

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import java.util.ArrayList;

import java.util.HashMap;

import java.util.Arrays;

public class hashMaps {

public static void main(String[] args) {

HashMap<String, ArrayList<Double>> students = new HashMap<>();

students.put("Stamat", new ArrayList<>());

students.put("Pesho", new ArrayList<>());

students.put("Minka", new ArrayList<>());

students.get("Pesho").addAll(Arrays.asList(2.3,5.00,6.00));

students.get("Stamat").addAll(Arrays.asList(3.11,5.50,3.22));

students.get("Minka").addAll(Arrays.asList(5.50,4.00,5.20));

ArrayList<Double> stamatsGrades = students.get("Stamat");

System.out.println(stamatsGrades);

stamatsGrades.remove(0);

stamatsGrades.add(0,6.00);

stamatsGrades.add(2,5.00);

stamatsGrades.remove(3.22);

System.out.println(stamatsGrades);

}

}