static getTable(t) {
			switch (t) {
				case 'L':
					return Table.LOWER;
				case 'P':
					return Table.PUNCT;
				case 'M':
					return Table.MIXED;
				case 'D':
					return Table.DIGIT;
				case 'B':
					return Table.BINARY;
				case 'U':
				default:
					return Table.UPPER;
			}
		}
gets the table corresponding to the char passed