Opposite 1 package oppositedirection; 2 3 public class OppositeDirection { 4 5 6 7 8 9 10 11 12 13 14 15 16 Direction.java 17 18 19 } 20 /** * Determines and returns the opposite direction. * Returns "up" if direction is "down", "down" if direction is "up", * "right" if direction is "left", "left" if direction is "right", "none" if * direction is anything else. * Return value is case sensitive. * @param direction The direction to be evaluated. * @return String containing the opposite direction from the provided direction. */ public String opposite Direction(String direction) { // write your code here B IQ QI } Description If statements may be useful Opposite direction QQF Implement the function public string oppositeDirection(String direction) in the manner described by the comments. SimpleCalculator.java 1 package simplecalculator; 2 3 /** 4 * A simple calculator that takes two operands and an operator to return a result. 5 */ 6 public class SimpleCalculator { 7 8 9 10 11 12 13 14 15 16 17 } /** * Calculates the result of applying 'operator' to 'operand1' and 'operand2'. @param operand1 First value of operation. BQ Q ] # / * @param operand2 Second value of operation. * @param operator The operator to apply in this operation. * @return The result of calculating the 'operator' applied to the two operands. */ public static double calculate (double operand1, double operand2, char operator) { } Description Implement a Simple Calculator You are to implement a simple calculator that can perform the four basic arithmetic operations of addition, subtraction, multiplication and division. It should also be able to perform two other operations: return the remainder of division (modulo); and perform exponentiation, that raise a number to a power. The calculator should be implemented in a class called calculator. This class should have a single public static method with the following signature: Q Q public static double calculate (double operand1, double operand2, char operator) The valid operators are: You should use a switch statement to implement the logic of the calculate method. You may implement any private methods that you think are appropriate. + is operand1 plus operand2 o - is operand1 minus operand2 o is operand1 multiplied by operand2 / is operand1 divided by operand2 o o % is the remainder after dividing operand1 by operand2 o^is operand1 raised to the power of operand2 You may ignore any arithmetic errors generated by the calculations. (That is you can let any exceptions that might be caused by the operation to pass back to the caller.)