Join all but first elements in a list to string

Question

Following this thread on how to join a list into a String,

I'm wondering what the most succinct way to drop an element from the list and then join the remaining list. For example, if my list is:

[a, b, c, d]

and I want the String:

"bcd"

How could I most succinctly drop a and then join the remaining elements? I'm new to Java, and my solutions feel heavy-handed.

in Groovy: `['a', 'b', 'c', 'd'][1..-1].join()` – Marslo Jul 20 '21 at 08:01 — Marslo, Jul 20 '21 at 08:01

score 20 · Accepted Answer · answered Dec 23 '15 at 16:52

20

If you're using java8 I like using streaming and the available collectors:

String result = list.stream().skip(1).collect(Collectors.joining(""));

answered Dec 23 '15 at 16:52

Reut Sharabani

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Thanks, that is very pretty. Hmm, on my corporate box, I'm stuck with java 7 :( – Adam Hughes Dec 23 '15 at 16:59
Well, you should probably use some library that has a `StringUtils` equivalent. Or just write your own function using a `StringBuilder`. – Reut Sharabani Dec 23 '15 at 17:01

atao · Answer 2 · 2015-12-23T17:09:54.020

4

String[] data = {"a", "b", "c", "d"};
String[] f = Arrays.copyOfRange(data, 1, 4);
String r = Arrays.toString(f).substring(1).replaceAll("\\]$", "").replaceAll(", ", "");

It does the job with Java 6 and without any library.

edited Dec 23 '15 at 17:09

answered Dec 23 '15 at 17:01

atao

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score 1 · Answer 3 · answered Dec 23 '15 at 17:25

1

if you want to drop another element like first, or more elements ,you can do it with filter. It is very universal way in my opinion.

    String [] array = {"a","b","c","d", "a"};
    List<String> list = Arrays.asList(array);
    String result = list.stream().filter(element -> !element.equals("a")).collect(Collectors.joining(","));
    String result2 = Arrays.stream(array).filter(element -> !element.equals("a")).collect(Collectors.joining(","));

    System.out.println(result);
    System.out.println(result2);

answered Dec 23 '15 at 17:25

Ján Яabčan

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Is this also Java 8 only? – Adam Hughes Dec 23 '15 at 17:28
unfortunately yes, It is only in Java 8 – Ján Яabčan Dec 23 '15 at 17:29
What about Arrays.stream() – Liam Clark Dec 23 '15 at 21:21
Arrays.stream() is also in Java 8 only. – Ján Яabčan Dec 23 '15 at 22:11

Join all but first elements in a list to string

3 Answers3