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Combine Multiple Filter Conditions

Java Hard 12 views
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Combine Multiple Filter Conditions focuses on composing business rules from smaller predicates instead of writing one giant conditional block You receive a list of integers and must return values that satisfy the required combined logic In this dataset the effective rule corresponds to selecting numbers that pass all configured checks used by the judge then preserving their original order in the output list The recommended style is predicate composition build small reusable conditions combine them with logical and or negate then apply the final predicate through stream filtering This keeps intent readable and makes rule changes safer because each piece can be tested independently It also prevents copy-paste condition drift across multiple functions The judge verifies exact list equality so both content and order matter Cases include no matches all matches and mixed inputs where only specific numbers survive Return only the filtered list with no formatting text This hard label is about maintainable functional design under layered conditions not mathematical complexity The key is writing rule composition that is explicit deterministic and easy for another developer to tweak without accidentally changing behavior in hidden edge cases Another practical benefit is testability each small predicate can be unit-tested independently then integration-tested as a composed rule That reduces debugging time when business logic changes and makes it obvious which rule caused an item to be accepted or rejected When the task involves connectivity or route cost build adjacency carefully and guard

Algorithm Flow

Recommendation Algorithm Flow for Combine Multiple Filter Conditions - Budibadu
Recommendation Algorithm Flow for Combine Multiple Filter Conditions - Budibadu

Best Answers

java - Approach 1
import java.util.List;
import java.util.stream.Collectors;
import java.util.function.Predicate;

class Solution {
    public List<Integer> filterNumbers(List<Integer> numbers) {
        Predicate<Integer> isGreaterThan10 = n -> n > 10;
        Predicate<Integer> isEven = n -> n % 2 == 0;
        Predicate<Integer> isDivisibleBy5 = n -> n % 5 == 0;
        
        return numbers.stream()
                     .filter(isGreaterThan10.and(isEven).and(isDivisibleBy5))
                     .collect(Collectors.toList());
    }
}