Group Data in Java 8 Like a Pro (No More Nested Loops!)

🚀 Introduction

Grouping data manually? Java 8’s Collectors.groupingBy() makes it effortless!

Group Data in Java 8 Like a Pro (No More Nested Loops!)

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📝 The Problem: Manual Grouping with Loops

import java.util.*;

public class EmployeeService {
    public static Map<String, List<Employee>> groupByDepartment(List<Employee> employees) {
        Map<String, List<Employee>> grouped = new HashMap<>();
        for (Employee emp : employees) {
            grouped.computeIfAbsent(emp.getDepartment(), k -> new ArrayList<>()).add(emp);
        }
        return grouped;
    }
}

✔ Works, but nested loops clutter code.

✅ The Solution: Java 8 groupingBy()

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

public class EmployeeService {
    public…