求教两点坐标距离问题_Java相关

求教两点坐标距离问题

计算(x1, y1)和(x2, y2)两点之间的距离。所有的数和返回值都应该是double类型的。

搜索更多相关的解决方案: 坐标距离 double 返回值

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用java.awt.geom.Point2D的distance方法:

distance

public static double distance(double x1,
                              double y1,
                              double x2,
                              double y2)

Returns the distance between two points.

Parameters:: x1 - the X coordinate of the first specified point; y1 - the Y coordinate of the first specified point; x2 - the X coordinate of the second specified point; y2 - the Y coordinate of the second specified point
Returns:: the distance between the two sets of specified coordinates.
Since:: 1.2

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还是无弄明白，请具体点。。。
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import java.util.Scanner;
public class Jl{
public static void main(String []args){
Scanner sc=new Scanner(System.in);
a b=new a();
b.x1=sc.nextDouble();
b.y1=sc.nextDouble();
b.x2=sc.nextDouble();
b.y2=sc.nextDouble();
double ar=b.area();
System.out.println(ar);
}
}
class a{
double x1;
double y1;
double x2;
double y2;
double area(){
return (Math.sqrt((x1-x2)*(x1-x2))+(y1-y2)*(y1-y2));
}
}
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知道了不？？？

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这个会了，那个素数你搞好了无，还是弄不好，郁闷
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哦这个你急吗？？

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4楼的程序有一点小马虎导致计算的结果不正确改正后如下:
import java.util.Scanner;
public class Jl{
public static void main(String []args){
Scanner sc=new Scanner(System.in);
a b=new a();
b.x1=sc.nextDouble();
b.y1=sc.nextDouble();
b.x2=sc.nextDouble();
b.y2=sc.nextDouble();
double ar=b.area();
System.out.println(ar);
}
}
class a{
double x1;
double y1;
double x2;
double y2;
double area(){
return (Math.sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)));
}
}

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