大额数字转节权位

/**
 * 阿拉伯数字（支持正负整数）四舍五入后转换成中文节权位简洁计数单位，例如 -5_5555 =》 -5.56万
 *
 * @param amount 数字
 * @return 中文
 */
public static String formatSimple(long amount) {
	if (amount < 1_0000 && amount > -1_0000) {
		return String.valueOf(amount);
	}
	String res;
	if (amount < 1_0000_0000 && amount > -1_0000_0000) {
		res = NumberUtil.div(amount, 1_0000, 2) + "万";
	} else if (amount < 1_0000_0000_0000L && amount > -1_0000_0000_0000L) {
		res = NumberUtil.div(amount, 1_0000_0000, 2) + "亿";
	} else {
		res = NumberUtil.div(amount, 1_0000_0000_0000L, 2) + "万亿";
	}
	return res;
}

@Test
public void formatSimpleTest() {
	String f1 = NumberChineseFormatter.formatSimple(1_2345);
	Assert.assertEquals("1.23万", f1);
	f1 = NumberChineseFormatter.formatSimple(-5_5555);
	Assert.assertEquals("-5.56万", f1);
	f1 = NumberChineseFormatter.formatSimple(1_2345_6789);
	Assert.assertEquals("1.23亿", f1);
	f1 = NumberChineseFormatter.formatSimple(-5_5555_5555);
	Assert.assertEquals("-5.56亿", f1);
	f1 = NumberChineseFormatter.formatSimple(1_2345_6789_1011L);
	Assert.assertEquals("1.23万亿", f1);
	f1 = NumberChineseFormatter.formatSimple(-5_5555_5555_5555L);
	Assert.assertEquals("-5.56万亿", f1);
	f1 = NumberChineseFormatter.formatSimple(123);
	Assert.assertEquals("123", f1);
	f1 = NumberChineseFormatter.formatSimple(-123);
	Assert.assertEquals("-123", f1);
}