String-Joiner

Using a delimiter of “, “, appending strings will produce the result one, two, three.

    @Test
    public void testStringJoiner() {
        StringJoiner stringJoiner = new StringJoiner(", ");

        stringJoiner.add("one");
        stringJoiner.add("two");
        stringJoiner.add("three");

        Assert.assertEquals(stringJoiner.toString(), "one, two, three");
    }

Can be done similar to a strinbuilder , as add returns the string joiner object.

    @Test
    public void testStringJoinerReturnsStringJoiner() {
        StringJoiner stringJoiner = new StringJoiner(", ");

        stringJoiner.add("one").add("two").add("three");

        Assert.assertEquals(stringJoiner.toString(), "one, two, three");
    }

Using starting and ending values.

    @Test
    public void testStringJoinerWithStartingAndEndingValues() {
        StringJoiner stringJoiner = new StringJoiner(", ","Start{","}End");
        stringJoiner.add("one");
        stringJoiner.add("two");
        stringJoiner.add("three");

        Assert.assertEquals(stringJoiner.toString(), "Start{one, two, three}End");
    }

To create a pattern as [one], [two], [three]

``` /** * To create a pattern as [one], [two], [three] * So [ would be the starting symbol. * ] would be the ending symbol. * ], [ would be the delimiter. */ @Test public void testStringJoinerCreatingSquareBracketPattern() { StringJoiner stringJoiner = new StringJoiner(“], [”,”[”,”]”); stringJoiner.add(“one”); stringJoiner.add(“two”); stringJoiner.add(“three”);

    Assert.assertEquals(stringJoiner.toString(), "[one], [two], [three]");
} }