How to Efficiently Find a Carnet Object in an ArrayList by its codeIsin Property?

Retrieving Objects from an ArrayList Based on Property Value

The task at hand is to locate a specific object, namely a Carnet instance, within an ArrayList collection by leveraging its unique codeIsin property.

Java 8 Streams Approach

Java 8 introduces streams, which provide a concise and efficient way to work with data collections. To find the desired object:

public static Carnet findByCodeIsIn(Collection<Carnet> listCarnet, String codeIsIn) {
    return listCarnet.stream().filter(carnet -> codeIsIn.equals(carnet.getCodeIsin())).findFirst().orElse(null);
}

This method leverages stream() to traverse the list and filter() to select only the object with the matching codeIsin value. findFirst() retrieves the first matching element, and orElse() returns null if no match is found.

Generic Utility Class Approach

For scenarios where multiple object types (not just Carnet) or multiple search properties (not just codeIsin) are involved, consider creating a utility class to encapsulate the search logic:

public final class FindUtils {
    public static <T> T findByProperty(Collection<T> col, Predicate<T> filter) {
        return col.stream().filter(filter).findFirst().orElse(null);
    }
}

public final class CarnetUtils {
    public static Carnet findByCodeTitre(Collection<Carnet> listCarnet, String codeTitre) {
        return FindUtils.findByProperty(listCarnet, carnet -> codeTitre.equals(carnet.getCodeTitre()));
    }
    // Additional methods for other search criteria
}

This approach centralizes the search logic and allows for easy reuse across different object types and search properties.

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