Calculation using symbol (Problem_10)

 package School;

import java.util.Scanner;

public class Problem_10 {
    public static void main(String[] args) {
        Scanner in=new Scanner(System.in);
          int a[]=new int[4];
          String b[]=new String[3];
          int output=0;
          int count=0;
          int checker=0;// used for capturing index

        System.out.println("Enter element ");
        for (int i=0;i<4;i++){
            a[i]=in.nextInt();
        }
        System.out.println("Enter Symbol");
        for(int i=0;i<3;i++){
        b[i]=in.next();
        }
        for(int i=0;i<3;i++){
           switch (b[i]){
               case "+":
                   if(output==0){
                   output+=a[i]+a[i+1];
                   checker=2;

                   }
                   else
                   {
                       output+= a[checker];

                       checker++;
                   }
                       break;
               case "-":
                   if(output==0){
                       output-=a[i]-a[i+1];
                       checker=2;

                   }
                   else
                   {
                       output-= a[checker];

                       checker++;
                   }
                   break;
               case "*":
                   if(output==0){
                       output*=a[i]*a[i+1];
                       checker=2;

                   }
                   else
                   {
                       output*= a[checker];

                       checker++;
                   }
                   break;
               case "/":

                   try{
                           if(output==0){
                               output/=a[i]/a[i+1];
                               checker=2;

                           }
                           else {
                               output/= a[checker];

                               checker++;
                           }
                       }
                   catch (Exception e){
                       //System.out.println(e);

                   }


                   break;
           }

        }
        //System.out.println();
        System.out.println("Your Output :" +output);
    }
}