java作业jdk安装

Java作业：

1. 安装jdk。

  答：

 

源代码：

public class Point {

     public int x,y;

     public Point(int x,int y) {

      this.x=x;

      this.y=y;

     }

     public Point() {

      this(0,0);

      

     }

     public Point(Point p) {

      this(p.x,p.y);

     }

     public String toString(){

      return"("+this.x+","+this.y+")";

     }

     public static void main(String[] args) {

// TODO Auto-generated method stub

        Point point1=new Point();

        Point point2=new Point(40,30);

        System.out.println(new Line(point1,point2).toString());

}

}

class Line {

     public Point point1,point2;

     public Line(Point point1,Point point2) {

      this.point1=point1;

      this.point2=point2;

     }

     public double length(){

      int a=point1.x-point2.x;

      int b=point1.y-point2.y;

      double x=a*a+b*b;

      return Math.sqrt(x);

     }

     public String toString() {

      return "一条直线，起点"+point1.toString()+"终点"+point2.toString()+"长度"+String.format("%102f", length());

      

     }

}

1. 安装集成开发环境eclipse进行调试代码。

 

 

姓名：谢云川   20173311129