public static StringBuilder createBuilder(CharSequence... charSequences) {
        StringBuilder builder = new StringBuilder();
        if (charSequences == null || charSequences.length == 0) {
            return builder;
        }
        for (CharSequence sequence : charSequences) {
            builder.append(sequence);
        }
        return builder;
    }
@Test
    public void createBuilder() {
        StringBuilder s1 = StringUtil.createBuilder(null);
        Assert.assertEquals("", s1.toString());
        StringBuilder s2 = StringUtil.createBuilder("H", "ippo", "4j");
        Assert.assertEquals("Hippo4j", s2.toString());
    }