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hashMapPlusTree.java

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import java.util.ArrayList;

import java.util.HashMap;

import java.util.TreeMap;

import java.util.Arrays;

public class hashMapPlusTree {

public static void main(String[] args) {

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

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

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

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

students.get("Pesho").get("Java Fundamentals").addAll(Arrays.asList(5.50,4.5,6.00));

System.out.println(students.get("Pesho"));

}

}