public static String toCamel(String src, boolean isUpper) {
        return toUnderline(src, '_', isUpper);
    }
@Test
    public void testToCamel() {
        String result = FieldUtils.toCamel("ToCamel", true);
        Assert.assertEquals("TO_CAMEL", result);
        String result1 = FieldUtils.toCamel("ToCamel", false);
        Assert.assertEquals("to_camel", result1);
    }