Question

How to create 2 letters combination from A, B, C, and D in Java

Answer 1

// In a combination, the subset elements can be listed in any order.

class TwoLettersCombinationFromABCD_Java {
    private static void create_2_letters_combination( char[] letters) {
    	int size = letters.length;
    	
    	for (int i = 0; i < size; i++) {
    		for (int j = i + 1; j < size; j++) {
    		    System.out.format("%c%c\n", letters[i], letters[j]);
    		}
    	}
    }
    public static void main(String[] args) {
        char[] letters = {'A', 'B', 'C', 'D'};

	    create_2_letters_combination(letters);
    }
}

 
/*
run:

AB
AC
AD
BC
BD
CD
 
*/

 

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