How to make calculator in java

By inputting 2 integer that separated by an operator (+, -, * or /)

Example:

Enter two numbers separated by an operator : 34 + 12

34 + 12 = 46

Enter two numbers separated by an operator : 34 - 12

34 - 12 = 22

Enter two numbers separated by an operator : 34 * 12

34 * 12 = 408

Enter two numbers separated by an operator : 34 / 12

34 / 12 = 2.83

Thank you