public static boolean isFalse(Boolean b) {
        return b != null && !b;
    }
@Test
    public void testIsFalse() {
        Assert.assertTrue(CommonUtils.isFalse("false"));
        Assert.assertTrue(CommonUtils.isFalse("False"));
        Assert.assertFalse(CommonUtils.isFalse("null"));
        Assert.assertFalse(CommonUtils.isFalse(""));
        Assert.assertFalse(CommonUtils.isFalse("xxx"));

        Assert.assertFalse(CommonUtils.isFalse((Boolean) null));
        Assert.assertFalse(CommonUtils.isFalse(Boolean.TRUE));
        Assert.assertTrue(CommonUtils.isFalse(Boolean.FALSE));
    }