cannot find symbol method nextchar()??

import java.util.Scanner; 
public class Calc5{
    public static void main(String args[]) throws Exception{
        Scanner obj = new Scanner(System.in);
        System.out.println("please enter operand1: ");
        int a = obj.nextInt();
        System.out.println("please enter operand2: ");
        int b = obj.nextInt();
        double c ;
        System.out.println("please enter operator(+,-,x,/): ");
        char op = (char)System.in.read();
                if(op == '+'){
                c = a+b;
                    System.out.println ("a" +"+"+ "b");
                    System.out.println("the result is=" + c);
                }
                else if (op == '-'){
                c = a-b;
                    System.out.println ("operand1" +"-"+ "operand2");
                    System.out.println("the result is=" + c);
                }
                 else if  (op == '/'){
                c= a/b;
                       System.out.println ("operand1" +"/"+ "operand2");
                       System.out.println("the result is=" + c);
                 }
                else if (op == '*'){
                c = a * b;
                    System.out.println ("operand1" +"x"+ "operand2");
                    System.out.println ("the result is=" +c);
                }
} 
}