java程序如何判斷是一個等腰三角形？
package demo;
import java.util.Scanner;
public class Triangle
{
/**
* 等腰
*/
public static final int ISOSCELES = 1;
/**
* 等邊
*/
public static final int EQUILATERAL = 2;
/**
* 直角
*/
public static final int RIGHTANGLE = 4;
/**
* 普通
*/
public static final int GENERAL = 6;
/**
* 不構成三角形
*/
public static final int NOTHING = 7;
double a;
double b;
double c;
public Triangle ( double a, double b, double c )
{
this.a = a;
this.b = b;
this.c = c;
}
public static int isWhichOne ( Triangle triangle )
{
double a = triangle.a;
double b = triangle.b;
double c = triangle.c;
if (a + b > c && a + c > b && b + c > a && Math.abs (a - b) < c && Math.abs (a - c) < b && Math.abs (b - c) < a)
{
if (a == b && a == c)
{
return Triangle.EQUILATERAL | Triangle.ISOSCELES;
}
else if (a * a + b * b == c * c || a * a + c * c == b * b || c * c + b * b == a * a)
{
if (a == b || a == c || b == c)
{
return Triangle.RIGHTANGLE | Triangle.ISOSCELES;
}
return Triangle.RIGHTANGLE;
}
else if (a == b || a == c || b == c)
{
return Triangle.ISOSCELES;
}
else
{
return Triangle.GENERAL;
}
}
else
{
return Triangle.NOTHING;
}
}
public static double perimeter ( Triangle triangle )
{
return triangle.a + triangle.b + triangle.c;
}
public static double area ( Triangle triangle )
{
double a = triangle.a;
double b = triangle.b;
double c = triangle.c;
return 1.d / 4 * Math.sqrt (( a + b + c ) * ( a + b - c ) * ( a + c - b ) * ( b + c - a ));
}d
