public static String newBuilder(CharSequence... charSequences) {
        if (charSequences == null || charSequences.length == 0) {
            return StringUtil.EMPTY;
        }
        return createBuilder(charSequences).toString();
    }
@Test
    public void newBuilder() {
        String s1 = StringUtil.newBuilder(null);
        Assert.assertEquals("", s1);
        String s2 = StringUtil.newBuilder("H", "ippo", "4j");
        Assert.assertEquals("Hippo4j", s2);
    }