定义一个三角形类\x05\x05属性：三个边长a ,b ,c\x05函数：\x05\x05计算面积（ 根号下p(p-a)

package example;
public class Triangle {
public double grith(double a,double b,double c){
return a + b + c;
}
public double area(double a,double b,double c){
double p = (a + b + c) / 2;
double area = Math.sqrt(p * (p - a) * (p - b) * (p - c));
return area;
}

public static void main(String[] args) {
Triangle triangle = new Triangle();
System.out.println("The grith is :" + triangle.grith(3, 4, 5));
System.out.println("The area is :" + triangle.area(3, 4, 5));
}
}