line.java

初学java,最近帮同学作的一些实验

public class line extends father{
 double ax,ay;
 double bx,by;
 public line(double ax,double ay,double bx,double by)
 {
	 this.ax =ax;this.ay=ay;
	 this.bx=bx;this.by=by;
 }
 public double computC()
 {
	 double n=Math.pow( (ax-bx),2);
	 double m=Math.pow((ay-by),2);
	 c=Math.pow((n+m),0.5);
	 return c;
 }
 public double computS()
 {
	s=0; 
	return s;
 }
 public void computCenter()
 {
	 Cx=(ax+bx)/2;
	 Cy=(bx+by)/2;
 }
}