使用N个随机数从数组中创建10个数字的行

时间:2017-06-09 11:46:50

标签: java arrays random

我正在尝试使用N个随机数创建具有10个数字的行,这些随机数按递增顺序排序。我已设法创建一个包含N个随机数的数组,我也对它们进行了排序,但我不知道如何以10个数字的行打印它们。任何帮助将不胜感激。

这是我的N个随机数的代码:

public class Mergesort {

    private static double[] merge(double[] a, double[] b) {
        double[] c = new double[a.length + b.length];
        int i = 0, j = 0;
        for (int k = 0; k < c.length; k++) {
            if      (i >= a.length) c[k] = b[j++];
            else if (j >= b.length) c[k] = a[i++];
            else if (a[i] <= b[j])  c[k] = a[i++];
            else                    c[k] = b[j++];
        }
        return c;
    }

    public static double[] mergesort(double[] input) {
        int N = input.length;
        if (N <= 1) return input;
        double[] a = new double[N/2];
        double[] b = new double[N - N/2];
        for (int i = 0; i < a.length; i++)
            a[i] = input[i];
        for (int i = 0; i < b.length; i++)
            b[i] = input[i + N/2];
        return merge(mergesort(a), mergesort(b));
    }


   /***************************************************************************
    *  Check if array is sorted - useful for debugging.
    ***************************************************************************/
    private static boolean isSorted(double[] a) {
        for (int i = 1; i < a.length; i++)
            if (a[i] < a[i-1]) return false;
        return true;
    }



    // generate N real numbers between 0 and 1, and mergesort them
    public static void main(String[] args) {
        int N = Integer.parseInt(args[0]);
        double[] a = new double[N];
        for (int i = 0; i < N; i++)
            a[i] = (int)(Math.random() * 100 + 1);
        a = mergesort(a);
        for (int i = 0; i < N; i++)
            StdOut.println(a[i]);

        StdOut.println(isSorted(a));
    }
}

2 个答案:

答案 0 :(得分:1)

只需使用循环:

for (int i = 0; i<array.length;i++){ 
    System.out.print(array[i]);
    if (i%10 == 9) { // if i modulo 10 is 9 add an linebreak
       System.out.println();
    }
}

答案 1 :(得分:0)

使用System.out.print()代替System.out.println()

System.out.println()会自动添加&#34; \ n&#34;在System.out.print()获胜的情况下,在你的行尾。