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Copy pathMyStreamV2.java
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40 lines (33 loc) · 1.06 KB
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package lambda.lambda5.mystream;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Function;
import java.util.function.Predicate;
// static factory 추가
public class MyStreamV2 {
List<Integer> integerList;
private MyStreamV2(List<Integer> integerList) {
this.integerList = integerList;
}
// static factory
public static MyStreamV2 of(List<Integer> integerList) {
return new MyStreamV2(integerList);
}
public MyStreamV2 filter (Predicate<Integer> predicate){
List<Integer> filtered = new ArrayList<>();
for (Integer element : integerList) {
if(predicate.test(element)) filtered.add(element);
}
return new MyStreamV2(filtered);
}
public MyStreamV2 map (Function<Integer, Integer> mapper) {
List<Integer> mapped = new ArrayList<>();
for (Integer integer : integerList) {
mapped.add(mapper.apply(integer));
}
return new MyStreamV2(mapped);
}
public List<Integer> toList(){
return integerList;
}
}