程序报错缺少返回语句是什么原因？怎么解决？

[xy678910]

class Line {
Point start; // Start point of line
Point end; // End point of line

// Create a line from two points
Line(final Point start, final Point end) {
this.start = new Point(start);
this.end = new Point(end);
}

// Create a line from two coordinate pairs
Line(double xStart, double yStart, double xEnd, double yEnd) {
start = new Point(xStart, yStart); // Create the start point
end = new Point(xEnd, yEnd); // Create the end point
}

// Calculate the length of a line
double length() {
return start.distance(end); // Use the method from the Point class
}

// Convert a line to a string
public String toString() {
return "(" + start + "):(" + end + ")"; // As"(start):(end)"
} // that is,"(x1,y1):(x2,y2)"

// Return a point as the intersection of two lines
Point intersects(final Line line1) {
Point localPoint = new Point(0, 0);
double num = (this.end.y - this.start.y) * (this.start.x - line1.start.x) -
(this.end.x - this.start.x) * (this.start.y - line1.start.y);
double denom = (this.end.y - this.start.y) * (line1.end.x - line1.start.x) -
(this.end.x - this.start.x) * (line1.end.y - line1.start.y);
localPoint.x = line1.start.x + (line1.end.x - line1.start.x) * num / denom;
localPoint.y = line1.start.y + (line1.end.y - line1.start.y) * num / denom;
}
}
Error:(36, 5) java: 缺少返回语句

[hwj运维之路]

Point intersects(final Line line1) {
        Point localPoint = new Point(0, 0);
        double num = (this.end.y - this.start.y) * (this.start.x - line1.start.x) -
                (this.end.x - this.start.x) * (this.start.y - line1.start.y);
        double denom = (this.end.y - this.start.y) * (line1.end.x - line1.start.x) -
                (this.end.x - this.start.x) * (line1.end.y - line1.start.y);
        localPoint.x = line1.start.x + (line1.end.x - line1.start.x) * num / denom;
        localPoint.y = line1.start.y + (line1.end.y - line1.start.y) * num / denom;
    }

最后没有返回Point结果，加一行吧

return localPoint;

[快乐的，开心的。。]

[code=java]Point intersects(final Line line1) { Point localPoint = new Point(0, 0); double num = (this.end.y - this.start.y) * (this.start.x - line1.start.x) - (this.end.x - this.start.x) * (this.start.y - line1.start.y); double denom = (this.end.y - this.start.y) * (line1.end.x - line1.start.x) - (this.end.x - this.start.x) * (line1.end.y - line1.start.y); localPoint.x = line1.start.x + (line1.end.x - line1.start.x) * num / denom; localPoint.y = line1.start.y + (line1.end.y - line1.start.y) * num / denom; return localPoint； } 最后没有返回Point结果，在方法内最后加一行