计算三角形面积

import java.util.Scanner;

public class java1 {
    public static void main(String[] args) {
        double a,b,c,s;
        Scanner sc =new Scanner(System.in);

        System.out.print("a=");
        a=sc.nextDouble();
        System.out.print("b=");
        b=sc.nextDouble();
        System.out.print("c=");
        c=sc.nextDouble();

        s=getTriangleArea(a,b,c);

        if (s!=-1){
            System.out.println("s="+s);
        }else {
            System.out.println("提示：构不成三角形");
        }
    }
    private static double getTriangleArea ( double a, double b, double c){
        double s,p;
        if(a+b>c && b+c>a && c+a>b){
            p=(a+b+c)/2;
            s=Math.sqrt(p*(p-a)*(p-b)*(p-c));
        }else {
            s=-1;
        }
        return s;
    }
}