java基础求三角形的面积

public class E201_01_01 {
    public static void main(String[] args) {
        Scanner scan =new Scanner(System.in);
        System.out.println("输入三角形的三边");
        int a = scan.nextByte();
        int b = scan.nextByte();
        int c = scan.nextByte();
        float s =(a+b+c)/2f;
        float S = (float) Math.sqrt(s*(s-a)*(s-b)*(s-c));
        if (a+b>c && b+c>a && a+c>b){
            System.out.println(S);
        }
        else{
            System.out.println("不成立三角形");
        }
 
    }
}