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    <p>here is the one approach to your problem:</p> <pre><code>private static Scanner input; public static void main(String[] args) { input = new Scanner(System.in); final String result1 = getUserChoice(); final int digit = getNumberofDigit1(); final int number1 = getRandomNumber(digit); final int number2 = getRandomNumber(digit); System.out.println(number1 + result1 + number2); final int userAnswer = input.nextInt(); final int correctAnswer = getCorrectAnswer(number1, result1, number2); System.out.println( (userAnswer == correctAnswer) ? "Ok" : ("Wrong, right is: " + correctAnswer)); input.close(); } public static String getUserChoice() { System.out.println("Please enter the symbol that corresponds to one of the following problems\n" + "Addition (+)\n Subtraction (-)\n or Multiplication (*): "); return input.next(); } public static int getNumberofDigit1() { System.out.println("Enter a 1 for problems with one digit, or a 2 for two-digit problems: "); return input.nextInt(); } public static int getRandomNumber(final int numbers) { return (int) ( (numbers == 1) ? (1 + Math.random() * 9) : (10 + Math.random() * 90) ); } public static int getCorrectAnswer(final int number1, final String result1, final int number2) { if ("+".equals(result1)) return number1+number2; else if ("-".equals(result1)) return number1-number2; else if ("*".equals(result1)) return number1*number2; return -1; } </code></pre> <p>and here is a little bit another getCorrectAnswer part:</p> <pre><code>public interface IMyOperator { public int operation(final int a, final int b); }; static class classSum implements IMyOperator { public int operation(final int a, final int b) { return a+b; } } static class classSub implements IMyOperator { public int operation(final int a, final int b) { return a-b; } } static class classMul implements IMyOperator { public int operation(final int a, final int b) { return a*b; } } final static HashMap&lt;String, IMyOperator&gt; operators = new HashMap&lt;String, IMyOperator&gt;(3) {{ put("+", new classSum()); put("-", new classSub()); put("*", new classMul()); }}; public static int getCorrectAnswer(final int number1, final String result1, final int number2) { return operators.get(result1).operation(number1, number2); } </code></pre>
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    1. POconvert string to arithmetic operation
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    1. USIłya Bursov
    1. USIłya Bursov
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