public static String toStr(Number number, String defaultValue) {
		return (null == number) ? defaultValue : toStr(number);
	}
@Test
	public void toStrTest(){
		assertEquals("1", NumberUtil.toStr(new BigDecimal("1.0000000000")));
		assertEquals("0", NumberUtil.toStr(NumberUtil.sub(new BigDecimal("9600.00000"), new BigDecimal("9600.00000"))));
		assertEquals("0", NumberUtil.toStr(NumberUtil.sub(new BigDecimal("9600.0000000000"), new BigDecimal("9600.000000"))));
		assertEquals("0", NumberUtil.toStr(new BigDecimal("9600.00000").subtract(new BigDecimal("9600.000000000"))));
	}