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public class Selection {
    public static void sort(Comparable[] a) {
        // 将a[]按升序排列
        int N = a.length;
        for (int i = 0; i < N; i++) {
            int min = i;
            for (int j = i + 1; j < N; j++) {
                if (less(a[j], a[min])) {
                    min = j;
                }
            }
            exch(a, i, min);
        }
    }

    private static boolean less(Comparable v, Comparable w) {
        return v.compareTo(w) < 0;
    }

    private static void exch(Comparable[] a, int i, int j) {
        Comparable t = a[i];
        a[i] = a[j];
        a[j] = t;
    }

    private static void show(Comparable[] a) {
        for(int i=0;i<a.length;i++) {
            System.out.print(a[i]+" ");
        }
        System.out.println();
    }

    public static void main(String[] args) {
        Integer[] a = {1,3,7,7,0,5,7,1,0,5,9};
        sort(a);
        show(a);
    }
}