How Can I Group Java Objects by Attribute Using Streams?

Group Objects by Attribute Using Java 8 Streams

To group a list of objects by an attribute, Java 8 provides a concise solution using streams.

Consider the provided code where you have a list of Student objects and want to group them based on their location attribute. To achieve this, you can use the following steps:

// Create a list of Student objects
List<Student> studlist = new ArrayList<>();
// Add Student objects with different locations
// ... (as shown in the provided code)

// Group the Student objects by their location using Java 8 streams
Map<String, List<Student>> studlistGrouped =
    studlist.stream().collect(Collectors.groupingBy(student -> student.stud_location));

By using the stream's groupingBy method, you can effortlessly categorize the students into groups based on their location. The result is stored in a Map where the key is the location, and the value is a list of students belonging to that location.

This approach offers a clean and efficient way to group objects by any attribute, making it a valuable technique in Java 8 programming.

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