Question

Hi
I have written this part of code .before the for loop I have this arraylist :

[X :49.0 Y: 113.0 , angle :0.0, X :141.0 Y: 106.0 , angle :0.0, X :110.0 Y: 185.0 , angle: 1.0768211289482128, X :99.0 Y: 139.0 , angle: 1.9961041242180873, X :103.0 Y: 126.0 , angle : 2.4208694638343324]
which show "x" and "y" and "angle" of some points.
but in the for loop I want to remove those elements that are more than

X :110.0 Y: 185.0 , angle: 1.0768211289482128

BUT it print this array for me :

[X :49.0 Y: 113.0angle0.0, X :141.0 Y: 106.0 , angle:0.0, X :110.0 Y: 185.0 , angle: 1.0768211289482128, X :103.0 Y: 126.0 , angle: 2.4208694638343324]
which is incorrect

 int size  = list .size();
    for (int i=0;i<size;i++) {
        if (list.get(i).getAngle() > pivot.getAngle() ) {
            list.remove(i);
            size--;

        }
    }

please help me
thanks

Answer 1

Whenever you remove an element it shifts the indices of the following elements down by 1. The simplest fix is to go in reverse:

for (int i  = list.size() - 1; i >= 0; i--) {
    if (list.get(i).getAngle() > pivot.getAngle() ) {
        list.remove(i);
    }
}