point.java

这是一个JAVA的教学课件,详细的讲解了JAVA的内容

import java.math.*;



public class Point {

	/**
	 * @param args
	 */
	    int num=0;
		private double x;
		private double y;
		
		Point(){
			num ++;
			System.out.println("This is the "+num+" object");
		
		}
		 
		
		 void setPoint(double a,double b){
			this.x=a;
			this.y=b;
		}
		 void getPoint(){
			System.out.println("(x,y)="+"("+this.x+","+this.y+")");
		}
		  double distence(Point point2){
			
			return Math.sqrt((this.x-point2.x)*(this.x-point2.x)+(this.y-point2.y)*(this.y-point2.y));
		}
		
	
	 
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Point pt1=new Point();
		//pt1.pointmsg();
		pt1.setPoint(2.0, 1.0);
		pt1.getPoint();
		Point pt2=new Point();
		//pt2.pointmsg();
		pt2.setPoint(8.0, 9.0);
		pt2.getPoint();
		double dis=0.0;
		dis=pt1.distence(pt2);
		System.out.println("The distence between Point1 and Point2 is "+dis);
		Point pt3=new Point();
		pt3.setPoint(7, 13);
		System.out.println("The distence between Point1 and Point3 is "+pt1.distence(pt3));
		

	}
}