If you want to print hyphens instead of zeroes, then simply print hyphens instead of zeroes.
So instead of this:
System.out.print(scoreArray[x][y]);
you might write this:
if(scoreArray[x][y] == 0)
System.out.print("-");
else
System.out.print(scoreArray[x][y]);
Your question doesn’t include the code that prints the array so I can’t be more specific to your code.
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solved Display char instead of 0 in 2D Java array