public static double add(float v1, float v2) {
		return add(Float.toString(v1), Float.toString(v2)).doubleValue();
	}
@Test
	public void addTest2() {
		final double a = 3.15f;//精度丢失
		final double b = 4.22;
		final double result = NumberUtil.add(a, b);
		assertEquals(7.37, result, 0.01);
	}