1234567选择3个数字组合

public class cnk {
    public static void main(String[] args) {
        int[] n = new int[]{1,2,3,4,5,6,7};
        int i0 = 0;
        int i1;
        int i2;
        while(i0<n.length){
            i1=i0+1;
            while(i1<n.length){
                i2=i1+1;
                while(i2<n.length){
                    System.out.println(""+n[i0]+n[i1]+n[i2]);
                    i2++;
                }
                i1++;
            }
            i0++;
        }
    }
}