11/22/2023 0 Comments Convert string to list java 8![]() To transform the list in one small method call, use ListreplaceAll() : list. map(object -> Objects.toString(object, null)). You have not actually transformed the list you have created a new list. For this sake, the method we used earlier admits a third parameter as a lambda expression that will be in charge of merging the elements for a given duplicate key. Since this is actually not a list of strings, the easiest way is to loop over it and convert each item into a new list of strings yourself: List strings list.stream().If we are not sure or we simply donât know if the original list contains duplicities weâll use another Collector that can manage merging for these duplicities. ![]() In case a duplicate key is received, an IllegalStateException will be thrown as you can see in this test listToMap_duplicatesList_shouldThrowException. As the Map value we want to use the same element from the list, for this purpose Java offers out of the box Function.identity() which is the recommended equivalent for the expression gr -> gr.Īs already stated, one of the requirements for this Collector is that there are no duplicate keys within the initial list. Java 8 has introduced a new Stream API that lets us process data in a declarative manner. The first step is to convert the list into a Stream and then, without any transformation, collect the results using one of the default Java 8 Collectors.įor the Map key we are going to use the name of the repository in this case we are using the code GithubRepo::getName which is the recommended equivalent for the expression gr -> gr.getName(). The idea is to split the string using the split () method and pass the resultant array into the Arrays.asList () method, which returns a fixed-size List backed by an array. Using Arrays.asList with split () method. Guava, a very common one, has a convenience method to do the conversion: List characterList Chars.asList ('abc'.toCharArray ()) Set characterSet new HashSet (characterList) Share.1 repos.stream().collect(Collectors.toMap(GithubRepo::getName, Function.identity())) This post will discuss how to convert comma-separated String to list in Java.
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