Question

我制作了这段代码来计算数字：

import java.util.Random;

public class Sorting {
private double[] player;
private int k=5;
private int j=5;

public void sort(){
    player = new double[k];
    for(int i=1;i<k;i++){
        double tempp ;
            for(i=1;i<j;i++){
                tempp = Math.random() * i;
                player[i]=tempp;
                System.out.println("Result "+i+"="+player[i]);
            }
        }
} 

public static void main(String []args){
    Sorting k=new Sorting();
    k.sort();
}}

结果是：

Result 1=0.4529689730194949
Result 2=0.09643822768644617
Result 3=1.841047494651026
Result 4=2.1807153629323777

现在，我想添加一个标签，从最大到最小的结果编号标记为EXCELLENT，VERY GOOD，GOOD和BAD，如下所示：

Result 1=0.4529689730194949 labeled GOOD
Result 2=0.09643822768644617 labeled BAD
Result 3=1.841047494651026 labeled VERY GOOD
Result 4=2.1807153629323777 labeled EXCELLENT

Answer 1

public class Sorting
{
    private double[] player;
    private int k=5;
    private int j=5;

    String[] rating = {"BAD", "GOOD", "VERY GOOD", "EXCELENT"};

    public void sort()
    {
        player = new double[k];

        for(int i=1; i<k; i++)
        {
            double tempp;
            for(i=1; i<j; i++) // i should probably be zero since your array starts on value 0, not 1.
            {
                tempp = Math.random() * i;
                player[i]=tempp;
                System.out.println("Result " + i + " = " + player[i] + " Rating is " + rating[(int)player[i]]);
            }
        }
    } 

    public static void main(String[] args)
    {
        Sorting k = new Sorting();
        k.sort();
    }
}

你的代码似乎有些奇怪，但我解决了你所问的问题。

Answer 2

TreeSet已默认对数字进行排序。

这是我的版本：

示例输出：

结果：0.12754837127918317 =＆gt; BAD
结果：0.7956890627771006 =＆gt;优秀
结果：0.3123868511945034 =＆gt; GOOD
结果：0.6332109887264882 =＆gt; VERY_GOOD

public class FourRandomNumbersEvaluator {

    private TreeSet<Double> numbers;

    private Map<Double,Evaluation> numbersWithEvaluations = new HashMap<Double,Evaluation>();

    private enum Evaluation {BAD, GOOD, VERY_GOOD, EXCELLENT}

    private static final int NUMBER_OF_GENERATED_NUMBERS = 4;


    public FourRandomNumbersEvaluator(TreeSet<Double> 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<Double> generateNumbers() {
        TreeSet<Double> numbers = new TreeSet<Double>();
        while(numbers.size() < NUMBER_OF_GENERATED_NUMBERS){
            double number = Math.random();
            if(numberNotAlreadyExisting(numbers, number)){
                numbers.add(number);
            }
        }
        return numbers;
    }

    private static boolean numberNotAlreadyExisting(TreeSet<Double> 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<Double,Evaluation> numberWithEvaluation : numbersWithEvaluations.entrySet())
        System.out.println("Result: "+  numberWithEvaluation.getKey() + " => " + numberWithEvaluation.getValue());
    }
}

循环编号后添加标签

2 个答案: