CODEWITHSUNDEEP
javarubyswitch-statement
steve_gallagher
steve_gallagher

Reputation: 3898

Translating Ruby to Java : Does Java have a construct that is close to the Ruby switch statement

I'm trying to translate what the code I have, in Ruby, to Java.

So far I have been unable to come across a switch statement-type construct in Java that will let me call methods in the cases.

Does anyone have any suggestions for a replacement construct that performs similar to the code below. 

def move_validator
    message = nil

    case 
    when out_of_bounds?(@x_dest, @y_dest) == true
      message = "You cannot move off the board"

    when no_checker_at_origin? == true
      message = "There is no checker to move in requested location"

    when trying_to_move_opponents_checker? == true 
      message = "You cannot move an opponents checker"  

    when trying_to_move_more_than_one_space_and_not_jumping? == true
      message = "You cannot move more than one space if not jumping"

    when attempted_non_diagonal_move? == true
      message = "You can only move a checker diagonally"

    when attempted_move_to_occupied_square? == true
      message = "You cannot move to an occupied square"

    when non_king_moving_backwards? == true
      message = "A non-king checker cannot move backwards"

    when attempted_jump_of_empty_space? == true  
      message = "You cannot jump an empty space"

    when attempted_jump_of_own_checker? == true
      message = "You cannot jump a checker of your own color"

    when jump_available_and_not_taken? == true
      message = "You must jump if a jump is available"  

    else
      move
      if jumping_move?
        message = "jumping move"
        remove_jumped_checker
      end
      king_checkers_if_necessary
    end
    message
  end

Thanks.

Upvotes: 1

Views: 225

Answers (2)

Joop Eggen
Joop Eggen

Reputation: 109567

Just:

if (outOfBound(y, y)) {
    message = "...";
} else if (attemptedNonDiagonalMove()) {
    message = "...";
} else {
    ...
}

Or make every condition an object of your own Condition class with a test() and a getMessage() and have a List. Problem are the x, y parameters.

Upvotes: 1

Woot4Moo
Woot4Moo

Reputation: 24316

Updated: 

if(condition)  
{  
   function();  
}  
else if( condition)  
{  
   function();  
}

Downside is you will have to manually optimize the order in which they go.

Upvotes: 2

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