자바로 계산기 만들기 1

import java.util.Random;
import java.util.Scanner;
import java.io.*;

public class HelloWorld
{
 public static void main(String[] args) throws IOException
 {
  Scanner Num1 = new Scanner(System.in);
  Scanner Num2 = new Scanner(System.in);
  Scanner Cal = new Scanner(System.in);
  
  char val3;
    
  System.out.print("첫번째 숫자를 넣으세요 : ");
  int val1 = Num1.nextInt();
  System.out.print("두번째 숫자를 넣으세요 : ");
  int val2 = Num2.nextInt();
  System.out.print("연산을 적으세요 ! : ");
  val3 = (char)System.in.read();
  System.in.read();
  
  int result = 0;
  
  if(val3 == '+')
   result = val1 + val2;
  
  else if(val3 == '-')
   result = val1 - val2;
  
  else if(val3 == '*')
   result = val1 * val2;
  
  else if(val3 == '/')
   result = val1 / val2;

  else
  {
   System.out.println("연산자를 잘못 입력하셨습니다!");
   System.exit(0);
  }
  
  System.out.println("결과 : "+val1 +val3 +val2 +"=" +result);
 }
}