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Copy pathEx1_Number.java
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36 lines (27 loc) · 1.08 KB
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package lambda.lambda5.mystream;
import lambda.lambda5.filter.GenericFilter;
import lambda.lambda5.map.GenericMapper;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Predicate;
import static lambda.lambda5.filter.GenericFilter.filter;
public class Ex1_Number {
public static void main(String[] args) {
// 짝수만남기고, 남은 값의 2배를 반환,
List<Integer> numbers = List.of(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
List<Integer> directResult = direct(numbers);
System.out.println("directResult = " + directResult);
List<Integer> lambdaResult = lambda(numbers);
System.out.println("lambdaResult = " + lambdaResult);
}
private static List<Integer> lambda(List<Integer> numbers) {
return GenericMapper.map(filter(numbers, i -> i % 2 == 0), s -> s * 2);
}
private static List<Integer> direct(List<Integer> numbers) {
List<Integer> ans = new ArrayList<>();
for (Integer number : numbers) {
if(number % 2 == 0) ans.add(number*2);
}
return ans;
}
}