title: convert string to arithmetic operation
body: <p>I'm doing a program that presents the student with a math quiz. I am having trouble figuring out how to take the input problem type and turning that string into the arithmetic operator. Here is the method for that part of the code. Please and thanks!</p>
  
  <pre><code>public static String getUserChoice(String choice) {
      Scanner in = new Scanner(System.in);
  
      System.out.println("Please enter the symbol that corresponds to one of the following problems\n"
              + "Addition (+)\n Subtraction (-)\n or Multiplication (*): ");
      choice = in.next();
          if ("+".equals(choice)){
              return +;
          }
          }
      return choice;
  </code></pre>
  
  <p><strong>Update</strong>
  Here's the entire code if it helps see what I am doing.</p>
  
  <pre><code>    public static void main(String[] args) {
      int digit = 0;
      int random = 0;
  
      String result1 = getUserChoice("");
  
      digit = getNumberofDigit1(digit);
  
      int number1 = getRandomNumber1(digit);
      int number2 = getRandomNumber2(digit);
  
      System.out.println(number1 + result1 + number2);
      getCorrectAnswer(number1, result1, number2);
  
  }
  
  public static String getUserChoice(String choice) {
      Scanner in = new Scanner(System.in);
  
      System.out.println("Please enter the symbol that corresponds to one of the following problems\n"
              + "Addition (+)\n Subtraction (-)\n or Multiplication (*): ");
      choice = in.next();
  
  
      return choice;
  }
  
  public static int getNumberofDigit1(int digit) {
      Scanner in = new Scanner(System.in);
  
      System.out.println("Enter a 1 for problems with one digit, or a 2 for two-digit problems: ");
      digit = in.nextInt();
  
      return digit;
  }
  
  
  public static int getRandomNumber1(int numbers) {
          int random = 0;
              if (numbers == 1) {
                  random = (int) (1 + Math.random() * 9);
              } else if (numbers == 2) {
                  random = (int) (10 + Math.random() * 90);
              }
           return random;   
  }
  
  public static int getRandomNumber2(int numbers) {
      int random2 = 0;
              if (numbers == 1) {
                  random2 = (int) (1 + Math.random() * 9);
              } else if (numbers == 2) {
                  random2 = (int) (10 + Math.random() * 90);
              }
              return random2;
  }
  public static void getCorrectAnswer(int number1, String result1, int number2) {
  }
  
  public static void getUserAnswer() {
      Scanner in = new Scanner(System.in);
  
  }
  
  public static void CheckandDisplayResult() {
  }
  </code></pre>