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１０進数２桁の数値を１６進数に変換

static String hex(int dec) {
	String str = "0123456789ABCDEF";
	int hex2 = dec % 16;
	int hex1 = (dec - hex2) / 16;
	
	return str.substring(hex1, hex1 + 1) + str.substring(hex2, hex2 + 1);
}