3. Java Collections: Lists, Maps & Streams

Working with Java Collections

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
List<String> items = List.of("Laptop", "Mouse", "Keyboard");
List<String> upperItems = items.stream()
    .map(String::toUpperCase)
    .collect(Collectors.toList());
Map<String, String> userCredentials = Map.of(
    "admin", "AdminPass123",
    "tester", "TesterPass123"
);