Examples of java.util.Scanner.nextDouble()

java.util.Scanner.nextDouble()
Scans the next token of the input as a double. This method will throw InputMismatchException if the next token cannot be translated into a valid double value. If the translation is successful, the scanner advances past the input that matched.
If the next token matches the Float regular expression defined above then the token is converted into a double value as if by removing all locale specific prefixes, group separators, and locale specific suffixes, then mapping non-ASCII digits into ASCII digits via {@link Character#digit Character.digit}, prepending a negative sign (-) if the locale specific negative prefixes and suffixes were present, and passing the resulting string to {@link Double#parseDouble Double.parseDouble}. If the token matches the localized NaN or infinity strings, then either "Nan" or "Infinity" is passed to {@link Double#parseDouble(String) Double.parseDouble} as appropriate. @return the double scanned from the input @throws InputMismatchException if the next token does not match the Float regular expression, or is out of range @throws NoSuchElementException if the input is exhausted @throws IllegalStateException if this scanner is closed

        System.out.print("Enter the amount: "); //Ask user for end amount
        amount = input.nextDouble(); //Collect end amount
        System.out.print("Enter the number of years: "); //Ask user for year amount
        years = input.nextDouble(); //Collect year amount
        System.out.print("Enter the interest rate: "); //Ask user for interest amount
        interest = input.nextDouble(); //Collect interest amount
        principal = amount / (1 + years * interest); //Calculate start amount
        System.out.print("The amount needed is: " + money.format(principal)); //Print end amount formated as currency
        }
    } //end class definition

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        }
        if (action.equalsIgnoreCase("E")) {
          System.out.println(emp);
        } else if (action.equalsIgnoreCase("P")) {
          System.out.print("Enter the hours for associate or pay period for manager: ");
          payArg = input.nextDouble();
          payEmployee(emp, payArg);
        }
      }
    } while (!action.equalsIgnoreCase("Q"));
  }

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        double principal; //Variable to hold first amount
        double years;     //Variable to hold year  amount
        double interest;  //Variable to hold interest amount
        double amount;    //Variable to hold end   amount
        System.out.print("Enter the principal: "); //Ask user for first amount
        principal = input.nextDouble(); //Collect first amount
        System.out.print("Enter the number of years: "); //Ask user for year amount
        years = input.nextDouble(); //Collect year amount
        System.out.print("Enter the interest rate: "); //Ask user for interest amount
        interest = input.nextDouble(); //Collect interest amount
        amount = principal * (1 + years * interest); //Calculate end amount

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        double interest;  //Variable to hold interest amount
        double amount;    //Variable to hold end   amount
        System.out.print("Enter the principal: "); //Ask user for first amount
        principal = input.nextDouble(); //Collect first amount
        System.out.print("Enter the number of years: "); //Ask user for year amount
        years = input.nextDouble(); //Collect year amount
        System.out.print("Enter the interest rate: "); //Ask user for interest amount
        interest = input.nextDouble(); //Collect interest amount
        amount = principal * (1 + years * interest); //Calculate end amount
        System.out.print("The value after the term is: " + money.format(amount)); //Print end amount formated as currency
        }

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        System.out.print("Enter the principal: "); //Ask user for first amount
        principal = input.nextDouble(); //Collect first amount
        System.out.print("Enter the number of years: "); //Ask user for year amount
        years = input.nextDouble(); //Collect year amount
        System.out.print("Enter the interest rate: "); //Ask user for interest amount
        interest = input.nextDouble(); //Collect interest amount
        amount = principal * (1 + years * interest); //Calculate end amount
        System.out.print("The value after the term is: " + money.format(amount)); //Print end amount formated as currency
        }
    } //end class definition

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    System.out.print("First name: ");
    fName = input.nextLine();
    System.out.print("Last name: ");
    lName = input.nextLine();
    System.out.print("Beginning balance: ");
    bal = input.nextDouble();
    
    newAcct = new Account(bal, fName, lName);  //create account object
    accounts.add(newAcct);            //add account to bank accounts
    numAccts += 1;                //increment number of accounts

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        NumberFormat percent = NumberFormat.getPercentInstance();
        
        System.out.println("Please enter 5 grades."); //Ask User for 5 grades
        while (num < 5) { //do this while var num is less than 5
            System.out.print("#"+(num+1)+": "); //Ask for grade
            grade += input.nextDouble(); //Add grade to others
            num++; //add 1 to var num
        } //end while
        System.out.println("Grade Average: " + percent.format(grade / 5)); //Display Average Grade
        } //end main
    } //end class definition

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      } else if (!action.equalsIgnoreCase("Q")) {
        System.out.print("Enter account ID: ");
        acctID = input.next();
        if (action.equalsIgnoreCase("D")) {
          System.out.print("Enter deposit amount: ");
          amt = input.nextDouble();
          easySave.transaction(1, acctID, amt);
        } else if (action.equalsIgnoreCase("W")) {
          System.out.print("Enter withdrawal amount: ");
          amt = input.nextDouble();
          easySave.transaction(2, acctID, amt);

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          System.out.print("Enter deposit amount: ");
          amt = input.nextDouble();
          easySave.transaction(1, acctID, amt);
        } else if (action.equalsIgnoreCase("W")) {
          System.out.print("Enter withdrawal amount: ");
          amt = input.nextDouble();
          easySave.transaction(2, acctID, amt);
        } else if (action.equalsIgnoreCase("C")) {
          easySave.checkBalance(acctID);
        } else if (action.equalsIgnoreCase("R")) {
          easySave.deleteAccount(acctID);

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    NumberFormat money = NumberFormat.getCurrencyInstance();
    
    System.out.println(munozAccount);
    
    System.out.print("Enter deposit amount: ");
    data = input.nextDouble();
    munozAccount.deposit(data);
    System.out.println("Balance is: " + money.format(munozAccount.getBalance()));


    System.out.print("Enter withdrawal amount: ");
    data = input.nextDouble();

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