Java How to split String and delete a part of it?

Question

I have a list of String (List <String> titles) like this:

                    "xxxl54.AE",
                    "xxxl56.AP",
                    "xxxl57.AE",
                    "xxxl58.VP",
                    "xxxl59.WR",
                    "xxxl56.SD"

But I want to get this:

                    "xxxl54",
                    "xxxl56",
                    "xxxl57",
                    "xxxl58",
                    "xxxl59",
                    "xxxl56"

How do I delete the part that is to the right of the point?

Does this answer your question? Java: remove all characters after point — Joe
– Joe, Commented May 20, 2021 at 14:52

Eritrean · Accepted Answer · 2021-05-20 14:56:23Z

3

If you want to replace the strings in your original list:

titles.replaceAll(e -> e.split("\\.")[0]);

Example:

List<String> titles = new ArrayList<>();
titles.add("xxxl54.AE");
titles.add("xxxl56.AP");
titles.add("xxxl57.AE");

System.out.println("Before: " + titles);

titles.replaceAll(e -> e.split("\\.")[0]);

System.out.println("After: " + titles);

edited May 20, 2021 at 14:56

answered May 20, 2021 at 14:48

Eritrean

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2 Comments

guidop21 Over a year ago

Excuse me can you write all the steps ??

Eritrean Over a year ago

That is just a oneliner. There are no more steps.

VadymVL · Accepted Answer · 2021-05-20 14:50:43Z

3

You need to use combination of default String methods String.substring and String.indexOf

To modify each item of the list, you could use stream().map and to save it again as the modified list collect(Collectors.toList())

List <String> titles = new ArrayList<>();
titles.add("xxxl54.AE");
titles = titles.stream().map(it -> it.substring(0, it.indexOf("."))).collect(Collectors.toList());

But be careful - if one of the items doesn't have a "." in its content, you need to handle it separately:

List <String> titles = new ArrayList<>();
titles.add("xxxl54.AE");
titles.add("xxxl00AE");
titles = titles.stream().map(it -> {
    int dotIndex = it.indexOf(".");
    if(dotIndex != -1) {
        it.substring(0, dotIndex);
    }
    return it;
}).collect(Collectors.toList());

edited May 20, 2021 at 14:50

answered May 20, 2021 at 14:44

VadymVL

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