Contents

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

final class Flattener {

    List flatten(final List nestedList) {
        if (nestedList.isEmpty()) {
            return new ArrayList<>();
        } else {
            final List result = new ArrayList();

            final Object head = nestedList.get(0);
            final List tail = nestedList.subList(1, nestedList.size());

            if (head instanceof List) {
                result.addAll(flatten((List) head));
            } else {
                result.add(head);
            }

            result.addAll(flatten(tail));
            result.removeAll(Collections.singleton(null));
            return result;
        }
    }

}

Version data entries

317 entries across 317 versions & 1 rubygems

Version	Path
trackler-2.2.1.180	tracks/java/exercises/flatten-array/.meta/src/reference/java/Flattener.java
trackler-2.2.1.179	tracks/java/exercises/flatten-array/.meta/src/reference/java/Flattener.java
trackler-2.2.1.178	tracks/java/exercises/flatten-array/.meta/src/reference/java/Flattener.java
trackler-2.2.1.177	tracks/java/exercises/flatten-array/.meta/src/reference/java/Flattener.java
trackler-2.2.1.176	tracks/java/exercises/flatten-array/.meta/src/reference/java/Flattener.java
trackler-2.2.1.175	tracks/java/exercises/flatten-array/.meta/src/reference/java/Flattener.java
trackler-2.2.1.174	tracks/java/exercises/flatten-array/.meta/src/reference/java/Flattener.java
trackler-2.2.1.173	tracks/java/exercises/flatten-array/.meta/src/reference/java/Flattener.java
trackler-2.2.1.172	tracks/java/exercises/flatten-array/.meta/src/reference/java/Flattener.java
trackler-2.2.1.171	tracks/java/exercises/flatten-array/.meta/src/reference/java/Flattener.java
trackler-2.2.1.170	tracks/java/exercises/flatten-array/.meta/src/reference/java/Flattener.java
trackler-2.2.1.169	tracks/java/exercises/flatten-array/.meta/src/reference/java/Flattener.java
trackler-2.2.1.167	tracks/java/exercises/flatten-array/.meta/src/reference/java/Flattener.java
trackler-2.2.1.166	tracks/java/exercises/flatten-array/.meta/src/reference/java/Flattener.java
trackler-2.2.1.165	tracks/java/exercises/flatten-array/.meta/src/reference/java/Flattener.java
trackler-2.2.1.164	tracks/java/exercises/flatten-array/.meta/src/reference/java/Flattener.java
trackler-2.2.1.163	tracks/java/exercises/flatten-array/.meta/src/reference/java/Flattener.java
trackler-2.2.1.162	tracks/java/exercises/flatten-array/.meta/src/reference/java/Flattener.java
trackler-2.2.1.161	tracks/java/exercises/flatten-array/.meta/src/reference/java/Flattener.java
trackler-2.2.1.160	tracks/java/exercises/flatten-array/.meta/src/reference/java/Flattener.java