日期:2014-05-20 浏览次数:20827 次
public class Point {
    private int x;
    private int y;
    public Point(int x,int y){
        this.x=x;
        this.y=y;        
    }
    public int getX() {
        return x;
    }
    public void setX(int x) {
        this.x = x;
    }
    public int getY() {
        return y;
    }
    public void setY(int y) {
        this.y = y;
    }
}
public class Line {
    private Point point;
    private double slope;
    public boolean isParallel(Line line) {
        return false;
    }
    public Line(Point point,double slope){
        this.point=point;
        this.slope=slope;
    }
    public Line(Point p1,Point p2){//从这里开始实现
        
        
    }
}
public class Line {
   private Point point;
   private double slope;
   public double getSlope() {
      return slope;
   }
   public void setSlope(double slope) {
      this.slope = slope;
   }
   public Line(Point point, double slope) {
      this.point = point;
      this.slope = slope;
   }
   public Line(Point p1, Point p2) {
      this.slope = (p2.getY() - p1.getY()) / (p2.getX() - p1.getX());
   }
   public Line(int a, int b) {
      this.slope = -b / a;
   }
   public boolean isParallel(Line line) {
      return this.getSlope() == line.getSlope();
   }
}
------解决方案--------------------
//楼主可以参考一下
public class Line {
    private Point point;
    private double slope;
    public boolean isParallel(Line line) {
        if(this.slope==line.slope)return true;
        return false;
    }
    public Line(Point point,double slope){
        this.point=point;
        this.slope=slope;
    }
    public Line(Point p1,Point p2){
        this(p1,p2.getY()-p1.getY()/(p2.getX()-p1.getX()));//调用上面的构造器,求得斜率
        
    }
    public Line(int a,int b){
        this(new Point(a,0),new Point(0,b));
    }
    public static void main(String []args){
        Line l1=new Line(new Point(0,1),2);
        Line l2=new Line(new Point(2,3),3);
        System.out.print(l1.isParallel(l2));
    }
}
------解决方案--------------------
斜率好求,注意分母是0的情况即可。
------解决方案--------------------