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    <p>TreeSet already sort the numbers ascending by default. </p> <p>Here my version:</p> <p>Sample output:</p> <p><strong>Result: 0.12754837127918317 => BAD<br> Result: 0.7956890627771006 => EXCELLENT<br> Result: 0.3123868511945034 => GOOD<br> Result: 0.6332109887264882 => VERY_GOOD</strong> </p> <pre><code>public class FourRandomNumbersEvaluator { private TreeSet&lt;Double&gt; numbers; private Map&lt;Double,Evaluation&gt; numbersWithEvaluations = new HashMap&lt;Double,Evaluation&gt;(); private enum Evaluation {BAD, GOOD, VERY_GOOD, EXCELLENT} private static final int NUMBER_OF_GENERATED_NUMBERS = 4; public FourRandomNumbersEvaluator(TreeSet&lt;Double&gt; numbers) { if(numbers == null || numbers.size() != 4){ throw new IllegalArgumentException("your have to provide exactly 4 numbers"); } this.numbers = numbers; } public static void main(String[] args) { FourRandomNumbersEvaluator evaluator = new FourRandomNumbersEvaluator(generateNumbers()); evaluator.evaluate(); evaluator.printNumbersWithEvaluations(); } private static TreeSet&lt;Double&gt; generateNumbers() { TreeSet&lt;Double&gt; numbers = new TreeSet&lt;Double&gt;(); while(numbers.size() &lt; NUMBER_OF_GENERATED_NUMBERS){ double number = Math.random(); if(numberNotAlreadyExisting(numbers, number)){ numbers.add(number); } } return numbers; } private static boolean numberNotAlreadyExisting(TreeSet&lt;Double&gt; numbers, double number) { return !numbers.contains(number); } public void evaluate() { int i = 0; for(Double number : numbers){ numbersWithEvaluations.put(number, Evaluation.values()[i++]); } } private void printNumbersWithEvaluations(){ for(Map.Entry&lt;Double,Evaluation&gt; numberWithEvaluation : numbersWithEvaluations.entrySet()) System.out.println("Result: "+ numberWithEvaluation.getKey() + " =&gt; " + numberWithEvaluation.getValue()); } } </code></pre>
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    1. POAdd label after looping number
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    1. COi never try TreeSet before , but its useful for me, thank you ;)
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    2. CO@andewor always prefer collections over arrays when possible ;) Besides, since TreeSet ignores duplicates, I manage the case where there is a doubled value, look at the code.
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