Is it possible to clone names from the list to the specific array without creating a loop?-CodePudding

I have 35 categories inside this list List<CategoriesModel> categoriesModelList;, and I want to clone all names and put them inside this array String[] namesList, I'm currently cloning names using this code but I want to ask is there any method can clone names from list to the specific array without creating a loop?

String[] namesList = new String[categoriesModelList.size()];
for (int i = 0; i < categoriesModelList.size(); i  )
    namesList[i] = categoriesModelList.get(i).getName();

CategoriesModel.java

public class CategoriesModel {

    private int id;
    private String name;
    private boolean supportSubcategories;

    public CategoriesModel(int id, String name, boolean supportSubcategories) {
        this.id = id;
        this.name = name;
        this.supportSubcategories = supportSubcategories;
    }

    public int getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public boolean isSupportSubcategories() {
        return supportSubcategories;
    }

}

CodePudding user response：

You could use a stream:

String[] namesList = categoriesModelList.stream()
    .map(CategoriesModel::getName)
    .toArray(String[]::new);

CodePudding user response：

anyway you have to use loop operation.
but stream is more elegant.

String[] namesList = categoriesModelList.stream()
                .map(CategoriesModel::getName)
                .toArray(String[]::new);

CodePudding user response：

Use java.util.stream for it:

String[] names = categoriesModelList.stream()
     .map(category -> category.getName())
     .collect(Collectors.toList())
     .toArray(new String[]{});

Another variant avoid stream():

List<String> namesList = new LinkedList<>();
categoriesModelList.forEach(category -> namesList.add(category.getName()));
String[] names = namesList.toArray(new String[]{});

But this is just a workaround