Common Error: Trying to Modify Primitive Type Parameters

• void transfer(double amount, double otherBalance)
  {
     balance = balance - amount;
     otherBalance = otherBalance + amount;
  }

• Won't work
• Scenario:
  

  double savingsBalance = 1000;
  harrysChecking.transfer(500, savingsBalance);
  System.out.println(savingsBalance);
      

• In Java, a method can never change parameters of primitive type