/*
 * Card.java
 *
 * Computer Science 112, Boston University
 * 
 * A blueprint class for objects that represent a single playing card.
 */

public class Card {
    
    // Constant array containing the string representations
    // of all of the card ranks. 
    // The string for the numeric rank r is given by RANK_STRINGS[r].
    public static final String[] RANK_STRINGS = {
      "", "A", "2", "3", "4", "5", "6",
      "7", "8", "9", "10", "J", "Q", "K"
    };
    
    /*
     * rankNumFor:
     *
     * Understand the difference between == and .equals on reference types
     *
     */
    public static int rankNumFor(String rankString) {
	int index = -1;

        for (int i = 1; i < RANK_STRINGS.length; i++) {
            if (RANK_STRINGS[i] == rankString) {
                index = i;
		break;
            }
        }
        
        return index;
    }

    // Simple test main 
    //
    public static void main( String[] args ) {

	// Test 1 
	//
	// This test will seem to work correctly and produce the expected results, but only because 
	// the array and the input passed to the methid are
	// literal strings (referencing the same string object in the constant pool).
	//
	System.out.println( "Test #1" );
        System.out.println( rankNumFor( "J" ) );
        System.out.println( rankNumFor( "A" ) );
        System.out.println( rankNumFor( "6" ) );

	// Test 2
	//
	// This test will not work because the inputs being passed to
	// the method are new String objects.
	//
	System.out.println( "Test #2" );
        System.out.println( rankNumFor( new String("J") ) );
        System.out.println( rankNumFor( new String("A") ) );
        System.out.println( rankNumFor( new String("6") ) );
    }
}