# My code has no problem(works well on IDE), but cannot work on LeetCode.

• Hi, My code cannot work on leetcode, it gave me a Complie Error "error: cannot find symbol: method sort(Comparator)", but it works well in my Intellij IDEA.

Here is the code.

public class Solution {

private Double getSlope(Point point1, Point point2) {
if (point1.x == point2.x) {
if (point1.y > point2.y) {
return Double.NEGATIVE_INFINITY;
} else if (point1.y < point2.y) {
return Double.NEGATIVE_INFINITY;
} else {
return Double.MIN_VALUE;
}
}
return (double) (point2.y - point1.y) / (double) (point2.x - point1.x);
}

private int getMaximum(ArrayList<Point> pointArrayList, Point point) {
int max = 0;
double flag = Double.MIN_VALUE;
int counter = 0;
for (int i = 0; i < pointArrayList.size(); i++) {
double slope = getSlope(pointArrayList.get(i), point);
if (flag != slope) {
if (counter > max) {
max = counter;
}
flag = slope;
counter = 1;
} else {
counter++;
}
}
if (counter > max) {
max = counter;
}
return max;
}

public int maxPoints(Point[] points) {
int maxNumber = 0;

ArrayList<Point> pointArrayList = new ArrayList<Point>();
for (int i = 0; i < points.length; i++) {
}
for (int i = 0; i < points.length; i++) {
pointArrayList.sort(new Comparator<Point>() { //**Compile Error here.**

private Point point;

public Comparator setPoint(Point point) {
this.point = point;
return this;
}

@Override
public int compare(Point o1, Point o2) {
return getSlope(point, o1).compareTo(getSlope(point, o2));
}
}.setPoint(points[i]));

int number = getMaximum(pointArrayList, points[i]);
if (number > maxNumber) {
maxNumber = number;
}
}
return maxNumber;
}
}

Thank you.

• Not familiar with java, but change to below won't CE any more.

Collections.sort(pointArrayList, new Comparator<Point>() { //**Compile Error here.**

private Point point;

public Comparator setPoint(Point point) {
this.point = point;
return this;
}

@Override
public int compare(Point o1, Point o2) {
return getSlope(point, o1).compareTo(getSlope(point, o2));
}
}.setPoint(points[i]))

• Thank you so much, I will try that.

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