编写程序Line.java----P40编程题3--电科大中山学院

编写程序Line.java，定义一个类Line,表示二维平面上的“直线。

package j2se;

public class Point {
	int x;
	int y;
	Point(int x1,int y1){
		x = x1;
		y = y1;
	}
	double getDistance() {
		double distance = Math.sqrt(x*x+y*y);
		return distance;
	}

}
package j2se;

public class Line {
	Point startPoint;
	Point endPoint;
	Line(Point p1,Point p2){
		startPoint = p1;
		endPoint = p2;
	}
	Line(int x1,int y1,int x2,int y2){
		startPoint = new Point(x1,y1);
		endPoint = new Point(x2,y2);
	}
	double getLine() {
		int x = startPoint.x - endPoint.x;
		int y = startPoint.y - endPoint.y;
		double length = Math.sqrt(x*x + y* y);
		return length;
	}
	public static void main(String[] args) {
		Point p1 = new Point(1,1);
		Point p2 = new Point(2,2);
		Line line1 = new Line(p1,p2);
		System.out.println(line1.getLine());
	}
}