缺少返回语句制作三角形程序

I'm making a program that determines triangles. This is where I'm getting my error When I compile this. It gives an missing return statement at the end. How would fix this?

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试试这个

public String displayType(int side1, int side2,int side3)
{
    if(( side1+side2 > side3)){

        if(( side1==side2) && (side2==side3))//tell if equalateral
        {
            return "Equalateral Triangle.";
        }
        else if (( side1==side2) & (side2 != side3) || (side1 == side3) & (side3 != side1))//tells if isosceles
        {
            return "Isosceles Triangle.";
        }
        else if ((side1 != side2) & (side2 != side3))//tells if scalene
        {
            return "Scalene Triangle.";        

        }
                        }
  else{
     return "Not a triangle";
      }
  }