Question

java定义一个点类(point),包含x,y坐标数据成员,显示函数(show)和计算面积(getarea)的函数成员

java定义一个点类(point),包含x,y坐标数据成员,显示函数(show)和计算面积(getarea)的函数成员。以点为父类构建一个圆类重载计算面积的函数；定义一个直线类，以两个点类对象作数据成员，定义显示，求面积及长度函数
明天要用啊 谢谢各位iT了

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Answer 1

import java.lang.Math.*;

class point {

int x;
int y;

void show()
{
//don't know the purpose for this one.
}
double getarea()
{
return Math.sqrt(y*y + x*x);
}

}

class circirl extends point
{

int r;

double getarea(int r)
{
return (3.14*r*r);
}
}

public class line {
point point1;
point point2;

int getarea(point point1, point point2)
{
int length = point1.x - point2.x;
int width = point1.y - point2.y;
return Math.abs(width)*Math.abs(length);
}

double length(point point1, point point2)
{
int length = point1.x - point2.x;
int width = point1.y - point2.y;

double leng_point = Math.sqrt(length*length + width*width);
return leng_point;
}

public static void main(String[] args) {
line line =new line();
// circirl circirl = new circirl();
line.point1 = new point();
line.point1.x= 40;
line.point1.y= 40;
line.point2 = new point();
line.point2.x= 70;
line.point2.y= 90;

int len = line.getarea(line.point1,line.point2);
System.out.println("the len for the two point is "+len);

double sqre = line.length(line.point1,line.point2);
System.out.println("the squre for the two point is "+sqre);

}

}