title: Error: Main method not found in class Calculate, please define the main method as: public static void main(String[] args)
body: <p>I need help with the main method, I'm getting this error:</p>
  
  <pre><code>Error: Main method not found in class Calculate, please define the main method as:
      public static void main(String[] args)
  </code></pre>
  
  <p>Here's the code:</p>
  
  <pre><code>class Calculate {
  
  private double fn;
  private double sn;
  private char op;
  
  public void setNumber(double fnum, double snum){
      this.fn = fnum;
      this.sn = snum;
  }
  public double getNumber1(){
      return fn;
  }
  public double getNumber2(){
      return sn;
  }
  public void setOper(char oper){
      this.op = oper;
  }
  public char getOper(){
      return op;
  }
  public void getAnswer(){
      double ans;
      switch (getOper()){
          case 'a': {
              ans = add(getNumber1(), getNumber2());
              ansOutput(ans);
              break;
          }case 'b': {
              ans = sub (getNumber1(), getNumber2());
              ansOutput(ans);
              break;
          }case 'c': {
              ans = mul (getNumber1(), getNumber2());
              ansOutput(ans);
              break;
          }case 'd': {
              ans = div (getNumber1(), getNumber2());
              ansOutput(ans);
              break;
          }default:
              System.out.println("--------------------------");
              System.out.println("Invalid choice of operator");
              System.out.println("--------------------------");
          }
      }
      public static double add(double x,double y){
          return x + y;
      }
      public static double sub(double x, double y){
          return x - y;
      }
      public static double mul(double x, double y){
          return x * y;
      }
      public static double div(double x, double y){
          return x / y;
      }
  
      public static void ansOutput(double x){
          System.out.println("----------- -------");
          System.out.printf("the answer is %.2f\n", x);
          System.out.println("-------------------");
      }
  }
  </code></pre>