how to manage different vertices in triangle

in the inner for loop I have 0<p1,p2,p3<3 and they are integer. I want this for loop to assign value from 0 till 3 to each parameter in demoMethod.i.e., once the for loop executes it will send parameter like (1,2,3) to demomethod and for the second time it will send parameter (2,3,0) to the demoMethod. also the order of these three numbers are not important and they must开发者_运维问答 be different .it means that after two times that for loop executes it doesn't send parameter like (1,2,3) and (2,3,1). thanks

  public void Points(List<Point> pointList) {

    int n = pointList.size();

    if (n <= 2) {
        System.out.println("null");
    } else if (n == 3) {
        drawingLine();
    } else {

        for(int i = 0;i<n;i++){
          for(int j = 1;j<=(n-1)*(n-2)*(n-3)/6;j++){
             demoMethod(p1,p2,p3);
          }
        }
    }
}

I am not entirely sure what you are trying to do, but if I understand you correctly, you want to do something like this (?):

for(int i = 0;i<n;i++){
    for(int j = 1;j<=(n-1)*(n-2)*(n-3)/6;j++){
        int p1 =  j      % 4;
        int p2 = (j + 1) % 4;
        int p3 = (j + 2) % 4;
        demoMethod(p1,p2,p3);
    }
}