title: Why does my java program skip a if statement?
body: <p>im only 15 and new to java so i am trying to build a simple calculator, but i cant seem to figure out why this if statement is being ignored. I have check to be sure that all values are being stored and yes they are so i can not see any other problems which would explain this. Any help would be great! Look for the comment in the second class //This if statement</p>
  
  <p><em>The first class</em></p>
  
  <pre><code>public class CalculatorOperations {
  
      double fnum, snum,answer;
      String operation;
  
      void plus(){
  
          operation="+";
          answer = fnum + snum;
      }
  
      void subtract(){
  
          operation="-";
          answer = fnum - snum;
      }
  
      void multiple(){
  
          operation="*";
          answer = fnum * snum;
      }
  
      void divide(){
  
          operation="/";
          answer = fnum / snum;
      }
  
      void invalidOperation(){
  
          System.out.println("Invalid operation.");
      }
  
      void showAttributes(){
          System.out.println(fnum);
          System.out.println(snum);
          System.out.println(operation);
      }
  }
  </code></pre>
  
  <p><em>The second class</em></p>
  
  <pre><code>    import java.util.Scanner;
  
  public class calculatorApplication {
  
      public static void main(String [] args){
  
          CalculatorOperations Operators = new CalculatorOperations();
          Scanner userInput = new Scanner(System.in);
  
          String loop2 = null;
          boolean loop;
  
           while (loop = true){
  
              // Getting input and storing it
                  System.out.print("Please enter first number: ");
                  Operators.fnum = userInput.nextDouble();
  
                  System.out.println("TEST:"+Operators.fnum);
  
                  System.out.print("Please enter second number: ");
                  Operators.snum = userInput.nextDouble();
  
                  System.out.println("TEST:"+Operators.snum);
  
                  System.out.print("Please enter operation (+, -, * or /): ");
                  Operators.operation = userInput.next();
  
                  System.out.println("TEST:"+Operators.operation);
  
                  // this if statement
  
                  if (Operators.operation == "+") {
                      Operators.plus();
  
                  } else if (Operators.operation == "-") {
                      Operators.subtract();
  
                  } else if (Operators.operation == "*") {
                      Operators.multiple();
  
                  } else if (Operators.operation == "/") {
                      Operators.divide();
  
                  } else {
  
                      Operators.invalidOperation();
                  }
  
  
  
                  System.out.println("Answer: " +Operators.answer);
  
                  System.out.print("Would you like to do another sum? (yes or no): ");
                  loop2 = userInput.next();
  
  
           }
  
           if (loop2.equals("yes") || loop2.equals("Yes")){
               loop = true;
                  System.out.println();
                  System.out.println();
              }else{
                  loop = false;
                    // Closes scanner to prevent resource leaks 
                  userInput.close();
                  System.exit(0);
              }
  
  
                  }
  
      }
  </code></pre>