first commit

Test/src/main/Pokladna.java

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+package main;
+
+import java.util.Iterator;
+import java.util.TreeSet;
+
+class Pokladna {
+
+	TreeSet<Priehradka> priehradky;
+
+	Pokladna() {
+		priehradky = new TreeSet<Priehradka>();
+	}
+
+	public void vydaj(float value) {
+
+		Iterator<Priehradka> iterator = priehradky.descendingIterator();
+
+		float remaining = value;
+		while (iterator.hasNext() && remaining > 0) {
+			Priehradka current = iterator.next();
+			float returns = current.getCash(remaining);
+			remaining -= returns;
+			System.out.println("Returning: " + returns + " in " + current.getValue());
+		}
+		if (remaining >= 0) {
+			System.out.println("Cant return " + remaining);
+		} else {
+			System.out.println("Returned all");
+		}
+	}
+
+	public void addCash(float value, int count) {
+		boolean found = false;
+		for (Priehradka current: priehradky) {
+			if (current.getValue() == value) {
+				found = true;
+				current.addCash(count);
+			}
+		}
+		if (!found) {
+			priehradky.add(new Priehradka(value, count));
+		}
+	}
+
+	public static void main(String[] args) {
+
+		Pokladna pokladna = new Pokladna();
+
+		pokladna.addCash(5000, 2);
+		pokladna.addCash(2000, 2);
+		pokladna.addCash(1000, 4);
+		pokladna.addCash(500, 5);
+		pokladna.addCash(200, 4);
+		pokladna.addCash(100, 10);
+		pokladna.addCash(50, 9);
+		pokladna.addCash(20, 20);
+		pokladna.addCash(10, 5);
+		pokladna.addCash(2, 10);
+		pokladna.addCash(1, 50);
+
+		pokladna.vydaj(22043.50f);
+
+
+	}
+}

Test/src/main/Priehradka.java

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+package main;
+
+class Priehradka implements Comparable<Priehradka> {
+
+	final float value;
+	int count;
+
+	Priehradka(float value) {
+		this.value = value;
+	}
+
+	Priehradka(float value, int count) {
+		this.value = value;
+		this.count = count;
+	}
+
+	/**
+	 * 
+	 * @param count accepts negative values
+	 */
+	public void addCash(int count) {
+		this.count += count;
+	}
+
+	/**
+	 * 
+	 * @param needed value
+	 * @return value that was available 
+	 */
+	public float getCash(float needed) {
+		float remaining = needed;
+		float result = 0;  //can be substitued with "return" object that holds value and count of returned coins (if you need to control how many coins can be returned total) 
+		while (remaining >= this.value && count > 0) {
+			remaining -= this.value;
+			result += this.value;
+			count--;
+		}
+		return result;
+	}
+
+	public float getValue() {
+		return this.value;
+	}
+
+	@Override
+	public int hashCode() {
+		return Float.hashCode(value);
+	}
+
+	@Override
+	public boolean equals(Object o) {
+		if (o instanceof Priehradka) {
+			return this.value == ((Priehradka) o).value;
+		} else {
+			return false;
+		}
+	}
+
+	@Override
+	public int compareTo(Priehradka arg0) {
+		return Float.compare(this.value, arg0.value);
+	}
+}